From jurgis.pralgauskis at gmail.com Thu Mar 8 06:02:51 2018 From: jurgis.pralgauskis at gmail.com (Jurgis Pralgauskis) Date: Thu, 8 Mar 2018 13:02:51 +0200 Subject: [Edu-sig] Online Python (and other scripts) debug tool (onlinegdb.com) Message-ID: Nice for education purposes :) https://www.onlinegdb.com/blog/introducing-python-debugger-mode-with-pdb-console/ -- Jurgis Pralgauskis tel: 8-616 77613; Don't worry, be happy and make things better ;) http://galvosukykla.lt -------------- next part -------------- An HTML attachment was scrubbed... URL: From wes.turner at gmail.com Thu Mar 8 11:25:46 2018 From: wes.turner at gmail.com (Wes Turner) Date: Thu, 8 Mar 2018 11:25:46 -0500 Subject: [Edu-sig] Online Python (and other scripts) debug tool (onlinegdb.com) In-Reply-To: References: Message-ID: +1 Do ipdb or pdb++ work? https://github.com/gotcha/ipdb https://pypi.org/project/ipdb import ipdb ipdb.set_trace() https://github.com/antocuni/pdb https://pypi.org/project/pdbpp/ pdb.set_trace() breakpoint() # Python 3.7+ ... https://github.com/quobit/awesome-python-in-education #interactive-environments #debuggers On Thursday, March 8, 2018, Jurgis Pralgauskis wrote: > Nice for education purposes :) > https://www.onlinegdb.com/blog/introducing-python-debugger-mode-with-pdb- > console/ > > -- > Jurgis Pralgauskis > tel: 8-616 77613; > Don't worry, be happy and make things better ;) > http://galvosukykla.lt > -------------- next part -------------- An HTML attachment was scrubbed... URL: From kirby.urner at gmail.com Tue Mar 20 13:47:13 2018 From: kirby.urner at gmail.com (kirby urner) Date: Tue, 20 Mar 2018 10:47:13 -0700 Subject: [Edu-sig] generic objects (including lambdas) as dict keys?: not usually a problem Message-ID: I just discovered for myself what many must already know: lambda expressions may serve as dict keys (I knew values). That means they may partake of the mutability of some functions, in having mutable default parameter values. In [122]: d = {lambda x=[10]: print(x.append(11), x) : 3} In [123]: list(d.keys())[0]() None [10, 11] In [124]: list(d.keys())[0]() None [10, 11, 11] In [125]: list(d.keys())[0]() None [10, 11, 11, 11] In [126]: list(d.keys())[0]() None [10, 11, 11, 11, 11] That's not going to corrupt the dict though. In general, callable objects may serve as keys, with lambda expressions a special case. So what if the object points to mutable content. In [127]: class Callable: ...: def __init__(self): ...: self.the_list = [] ...: def __call__(self, *args): ...: self.the_list.extend(args) In [128]: obj = Callable() In [129]: the_dict = {obj : 3} In [130]: list(the_dict.keys())[0]("troll farm") In [131]: obj.__dict__ Out[131]: {'the_list': ['troll farm']} On the other hand, if you define __eq__ vis-a-vis something mutable, then the dict-maker will have 2nd thoughts about the viability of your enterprise. So nothing that earth-shaking. It's the Python we all know. Just thought I'd say hi. More soon. Kirby Urner Portland, OR -------------- next part -------------- An HTML attachment was scrubbed... URL: From kirby.urner at gmail.com Fri Mar 23 01:53:02 2018 From: kirby.urner at gmail.com (kirby urner) Date: Thu, 22 Mar 2018 22:53:02 -0700 Subject: [Edu-sig] still admiring J Message-ID: Greetings edu-siggers! Way back in the archives you'll find me extolling a language known as J, by Kenneth Iverson, his son Eric, and Roger Hui. I never met any of these guys in person, but knew of Iverson through APL, which I discovered at Princeton, and fell in love with. Iverson helped me squish some typos in my Jiving with J.[1] What I admire about J, as about R and Python via Numpy, is the inclusion of an n-Dimensional Block (array, addressable memory with multiple axes), as a language native, a core star. J reads like a right-to-left pipeline with an nD Block going through it. I guess we'd need to call that a Functional Programming language right? As the former high school math teacher (long ago -- though I'm still in the schools, as recently as today in fact, as an after school Python instructor), I still chafe at the fact that we don't dive in with these tools at that age level, except in rare cases, and instead insist on students buying all those TIs year after year. But that's me the broken record. For those schools that break out, charter or public (nevermind, how they talk in the US makes noooo sense), there's a world of wonderful technology to explore, while learning the math that matters. y = mx + b. Turn m over for w, and b is for bias.[2] Kirby [1] http://www.4dsolutions.net/ocn/Jlang.html [2] https://www.google.com/search?q=mcdonalds+upside+down+w&safe=off&source=lnms&tbm=isch (recent meme) -------------- next part -------------- An HTML attachment was scrubbed... URL: From wes.turner at gmail.com Fri Mar 23 04:33:57 2018 From: wes.turner at gmail.com (Wes Turner) Date: Fri, 23 Mar 2018 04:33:57 -0400 Subject: [Edu-sig] still admiring J In-Reply-To: References: Message-ID: On Friday, March 23, 2018, kirby urner wrote: > > Greetings edu-siggers! > > Way back in the archives you'll find me extolling a language known as J, > by Kenneth Iverson, his son Eric, and Roger Hui. I never met any of these > guys in person, but knew of Iverson through APL, which I discovered at > Princeton, and fell in love with. Iverson helped me squish some typos in > my Jiving with J.[1] > > What I admire about J, as about R and Python via Numpy, is the inclusion > of an n-Dimensional Block (array, addressable memory with multiple axes), > as a language native, a core star. > xarray.Dataset is n-dimensional https://xarray.pydata.org/en/stable/ >From a tweet a few days ago https://twitter.com/westurner/status/973058715149578240 : Exercise: - Describe the 3D vertices of a cube: (x,y,z). - Apply a linear transformation (e.g. rotation): (t, x, y, z) - Determine how to project 3D points into 2D (first with wireframes, then with clipping) #Mayavi and #Blender can do 3D + time in Python. #Matplotlib can do 2D animated GIFs and, with #mplot3d, 3D animated GIFs And then view point density from one perspective with a hexbin chart and binned marginal distributions https://t.co/59fO6c6JSf #hexbin plot w/ marginal distributions #seaborn https://t.co/FHe3L4oOSw https://t.co/K6WI8NcF4i 2D "Linear transformations and matrices | Essence of linear algebra, chapter 3" by @3Blue1Brown https://youtube.com/watch?v=kYB8IZa5AuE ... And then special relativity and Lorentz transformations of spacetime with tensors: https://en.wikipedia.org/wiki/Lorentz_transformation "Lorentz transformation for change in coordinates | Physics | Khan Academy" https://youtube.com/watch?v=1F1tFouUGTU "Introduction to the Lorentz transformation | Special relativity | Physics | Khan Academy" https://youtube.com/watch?v=HIQ5hnm61LQ ... With time t, the cube exercise coordinates are really 4D (*), but they can be projected into a table with columns like: t, v1x, v1y, v1z, ..., v8x, v8y, v8z This (and other multidimensional data) can be represented with pandas.DataFrame or pandas.Panel, though pandas.Panel is being deprecated in favor of xarray or just multidimensional indices and pd.DataFrame: https://pandas.pydata.org/pandas-docs/stable/dsintro.html#deprecate-panel * Actually, it's all 2D: https://en.wikipedia.org/wiki/Holographic_principle > In a larger sense, the theory suggests that the entire universe can be seen as two-dimensional information on the cosmological horizon, the event horizon from which information may still be gathered and not lost due to the natural limitations of spacetime supporting a black hole, an observer and a given setting of these specific elements,[clarification needed] such that the three dimensions we observe are an effective description only at macroscopic scales and at low energies. Cosmological holography has not been made mathematically precise, partly because the particle horizon has a non-zero area and grows with time. > > J reads like a right-to-left pipeline with an nD Block going through it. > I guess we'd need to call that a Functional Programming language right? > > As the former high school math teacher (long ago -- though I'm still in > the schools, as recently as today in fact, as an after school Python > instructor), I still chafe at the fact that we don't dive in with these > tools at that age level, except in rare cases, and instead insist on > students buying all those TIs year after year. But that's me the broken > record. > > For those schools that break out, charter or public (nevermind, how they > talk in the US makes noooo sense), there's a world of wonderful technology > to explore, while learning the math that matters. y = mx + b. Turn m over > for w, and b is for bias.[2] > > Kirby > > [1] http://www.4dsolutions.net/ocn/Jlang.html > > [2] https://www.google.com/search?q=mcdonalds+upside+down+w& > safe=off&source=lnms&tbm=isch (recent meme) > > -------------- next part -------------- An HTML attachment was scrubbed... URL: From kirby.urner at gmail.com Fri Mar 23 15:12:25 2018 From: kirby.urner at gmail.com (kirby urner) Date: Fri, 23 Mar 2018 12:12:25 -0700 Subject: [Edu-sig] still admiring J In-Reply-To: References: Message-ID: On Fri, Mar 23, 2018 at 1:33 AM, Wes Turner wrote: > > xarray.Dataset is n-dimensional > https://xarray.pydata.org/en/stable/ > > From a tweet a few days ago https://twitter.com/westurner/ > status/973058715149578240 : > > ?Excellent pointers! I anticipate a steady stream of new math teachers (sort of like I was some decades back, teaching high school level in Jersey City, first job outta college), and getting to where they're hungry to include more coding, and need appropriately mathy topics. Lots out there already, a steadily growing stash since the early days, of Logo and OLPC (One Laptop per Child), SugarLabs... The Learning to Code movement (code.org etc.) is but the latest in a series of chapters. BTW, one of my code school mentors just showed me this one: http://www.codebymath.com/index.php/welcome/lesson_menu My own contributions to this genre go back to what I called the "Numeracy Series". That's closer to when I first came across Python. I'd already played with "quadrays" in Visual Foxpro.[0] http://4dsolutions.net/ocn/numeracy0.html (that's part 1 of 4, early 2000s) I was into mixing Python with POV-Ray, the free ray-tracer, to get simple geometric figures. These days mathy high school level topics might include... ----- *1* Crypto: a gateway to group theory. Since my day, we've added more to the "fun reading" shelf, such as with Cryptonomicon (Stephenson, historical science fiction) and The Theory that Would Not Die (i.e. Bayesianism) by McGrayne. As clear from the cover (https://flic.kr/p/22z1vAy) she's covering a lot of the same territory: Bletchley Park, Alan Turing, enigma machines. You've got prime numbers, RSA, Elliptic Curves and hashlib SHA stuff. Introduce blockchain. A great way to access recent history. *2* Geometry: and in my case a genre of "mental geometry". My topic is the somewhat off-beat solid geometry of the geodesic dome dude (another movie coming up [2]), and my modality is often Python. One of the slides shows a Tetrahedron class with our formula for its volume, a public sandbox at REPL.IT. https://repl.it/@kurner/tetravolumes I don't remember if I've already shared this link ( https://goo.gl/zoVYF1 ) to my slide deck (Google Slides) for a recent talk at Systems Science building, Portland State [1]. That's probably still too off beat for most, whereas Fractals (dynamical systems, strange attractors, Wolfram automata), if counted as "geometry" (certainly visual) already have a strong following and both connect back to deeper math. I've done work around those topics too and attest to Python's applicability. *3* Data Science: which is where the nD-array ("xray", "tensor") and Linear Algebra come in, and Calculus (which they're learning anyway). When not connect Calc to Stats with a thicker pipeline right from the start? So what if the Gaussian Distribution doesn't have a closed form integral or whatever (https://goo.gl/9XyzN5 )? Not an issue. We just wanna make sense of the curves in some lessons, and both the CDF (the integral) and derivative of the PDF (normal curve) are worth talking about visually, and coding in Python.[3] ----- In sum: if you're a math teacher chomping at the bit for something fresh, and not already over-exploited by the test-maker economy (you still have a free hand), then we have riches in: Crypto (web browser TLS, eCommerce, Supermarket Math [4]); Geometry, including off-beat whole-number volumed polyhedrons from New England Transcendentalist literature (v 2.0); Machine Learning / Data Science. All accessible to high schoolers. Kirby [0] Quadrays are a weird coordinate system featuring a "caltrop" of basis rays to tetrahedron corner points (1,0,0,0) (0,1,0,0) (0,0,1,0) (0,0,0,1) from origin (0,0,0,0) -- but there's nothing "4D" in the sense of non-visualizable hyper-dimensional, just ordinary space mapping, 1-to-1 with XYZ if you stick to the unique canonical representation. http://mathforum.org/library/view/6236.html [1] http://worldgame.blogspot.com/2018/03/systems-science.html [2] https://youtu.be/oyLWPWydvyo [3] one of my Jupyter Notebooks about the bell curve: https://github.com/4dsolutions/Python5/blob/master/BellCurve.ipynb ? ?[4] http://wikieducator.org/Supermarket_Math -------------- next part -------------- An HTML attachment was scrubbed... URL: From wes.turner at gmail.com Fri Mar 23 16:29:41 2018 From: wes.turner at gmail.com (Wes Turner) Date: Fri, 23 Mar 2018 16:29:41 -0400 Subject: [Edu-sig] still admiring J In-Reply-To: References: Message-ID: On Friday, March 23, 2018, kirby urner wrote: > > On Fri, Mar 23, 2018 at 1:33 AM, Wes Turner wrote: > >> >> xarray.Dataset is n-dimensional >> https://xarray.pydata.org/en/stable/ >> >> From a tweet a few days ago https://twitter.com/westurner/ >> status/973058715149578240 : >> >> > ?Excellent pointers! > > I anticipate a steady stream of new math teachers (sort of like I was some > decades back, teaching high school level in Jersey City, first job outta > college), and getting to where they're hungry to include more coding, and > need appropriately mathy topics. > > Lots out there already, a steadily growing stash since the early days, of > Logo and OLPC (One Laptop per Child), SugarLabs... The Learning to Code > movement (code.org etc.) is but the latest in a series of chapters. > > BTW, one of my code school mentors just showed me this one: > http://www.codebymath.com/index.php/welcome/lesson_menu > > My own contributions to this genre go back to what I called the "Numeracy > Series". That's closer to when I first came across Python. I'd already > played with "quadrays" in Visual Foxpro.[0] > > http://4dsolutions.net/ocn/numeracy0.html (that's part 1 of 4, early > 2000s) > > I was into mixing Python with POV-Ray, the free ray-tracer, to get simple > geometric figures. > > These days mathy high school level topics might include... > > ----- > > *1* Crypto: a gateway to group theory. Since my day, we've added more to > the "fun reading" shelf, such as with Cryptonomicon (Stephenson, historical > science fiction) and The Theory that Would Not Die (i.e. Bayesianism) by > McGrayne. As clear from the cover (https://flic.kr/p/22z1vAy) she's > covering a lot of the same territory: Bletchley Park, Alan Turing, enigma > machines. You've got prime numbers, RSA, Elliptic Curves and hashlib SHA > stuff. Introduce blockchain. A great way to access recent history. > "Show HN: An educational blockchain implementation in Python" https://news.ycombinator.com/item?id=15945490 https://github.com/julienr/ipynb_playground/blob/master/bitc oin/dumbcoin/dumbcoin.ipynb https://cryptography.io/en/latest/ recommends https://www.crypto101.io/ (PDF) https://github.com/pyca/cryptography/blob/master/src/cryptography/hazmat/ primitives/ciphers/algorithms.py https://en.wikipedia.org/wiki/Fermat%27s_little_theorem https://en.wikipedia.org/wiki/RSA_(cryptosystem) "How secure is 256 bit security?" by @3blue1brown https://youtu.be/S9JGmA5_unY https://en.wikipedia.org/wiki/EdDSA#Ed25519 > *2* Geometry: and in my case a genre of "mental geometry". My topic is > the somewhat off-beat solid geometry of the geodesic dome dude (another > movie coming up [2]), and my modality is often Python. One of the slides > shows a Tetrahedron class with our formula for its volume, a public sandbox > at REPL.IT. https://repl.it/@kurner/tetravolumes > > I don't remember if I've already shared this link ( https://goo.gl/zoVYF1 > ) to my slide deck (Google Slides) for a recent talk at Systems Science > building, Portland State [1]. > > That's probably still too off beat for most, whereas Fractals (dynamical > systems, strange attractors, Wolfram automata), if counted as "geometry" > (certainly visual) already have a strong following and both connect back to > deeper math. I've done work around those topics too and attest to Python's > applicability. > Fractals... Mandelbrot https://en.wikipedia.org/wiki/Chaos:_Making_a_New_Science IDK what's a good Python package for fractals? > > > *3* Data Science: which is where the nD-array ("xray", "tensor") and > Linear Algebra come in, and Calculus (which they're learning anyway). When > not connect Calc to Stats with a thicker pipeline right from the start? > So what if the Gaussian Distribution doesn't have a closed form integral > or whatever (https://goo.gl/9XyzN5 )? Not an issue. We just wanna make > sense of the curves in some lessons, and both the CDF (the integral) and > derivative of the PDF (normal curve) are worth talking about visually, and > coding in Python.[3] > http://docs.sympy.org/latest/modules/stats.html#sympy.stats.Normal http://docs.sympy.org/latest/modules/integrals/integrals.html > > > ----- > > > In sum: if you're a math teacher chomping at the bit for something fresh, > and not already over-exploited by the test-maker economy (you still have a > free hand), then we have riches in: > > Crypto (web browser TLS, eCommerce, Supermarket Math [4]); > > Geometry, including off-beat whole-number volumed polyhedrons from New > England Transcendentalist literature (v 2.0); > > Machine Learning / Data Science. All accessible to high schoolers. > https://www.kaggle.com/learn https://jakevdp.github.io/PythonDataScienceHandbook/ https://developers.google.com/machine-learning/crash-course/ml-intro > Kirby > > [0] Quadrays are a weird coordinate system featuring a "caltrop" of basis > rays to tetrahedron corner points (1,0,0,0) (0,1,0,0) (0,0,1,0) (0,0,0,1) > from origin (0,0,0,0) -- but there's nothing "4D" in the sense of > non-visualizable hyper-dimensional, just ordinary space mapping, 1-to-1 > with XYZ if you stick to the unique canonical representation. > http://mathforum.org/library/view/6236.html > > [1] http://worldgame.blogspot.com/2018/03/systems-science.html > > [2] https://youtu.be/oyLWPWydvyo > > [3] one of my Jupyter Notebooks about the bell curve: > https://github.com/4dsolutions/Python5/blob/master/BellCurve.ipynb > > ? > ?[4] http://wikieducator.org/Supermarket_Math > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: From aivar.annamaa at ut.ee Wed Mar 28 03:18:54 2018 From: aivar.annamaa at ut.ee (Aivar Annamaa) Date: Wed, 28 Mar 2018 10:18:54 +0300 Subject: [Edu-sig] Simplest webapps Message-ID: <4bee909c-1437-4ed9-57b7-ce2dd709e0d2@ut.ee> Hi! Let's say my students are able to write programs like this: name = input("name") if name == "Pete": ??? greeting = "Hi" else: ??? greeting = "Hello!" print(f""" {greeting} {name}! """) I'd like to allow them start writing web-apps without introducing functions first (most web-frameworks require functions). It occurred to me that it's not hard to create a wrapper, which presents this code as a web-app (input would be patched to look up GET or POST parameters with given name). This approach would allow simple debugging of the code on local machine and no extra libraries are required in this phase. Any opinions on this? Has this been tried before? best regards, Aivar -------------- next part -------------- An HTML attachment was scrubbed... URL: From andre.roberge at gmail.com Wed Mar 28 06:08:40 2018 From: andre.roberge at gmail.com (Andre Roberge) Date: Wed, 28 Mar 2018 07:08:40 -0300 Subject: [Edu-sig] Simplest webapps In-Reply-To: <4bee909c-1437-4ed9-57b7-ce2dd709e0d2@ut.ee> References: <4bee909c-1437-4ed9-57b7-ce2dd709e0d2@ut.ee> Message-ID: See below for comments. On Wed, Mar 28, 2018 at 4:18 AM, Aivar Annamaa wrote: > Hi! > Let's say my students are able to write programs like this: > > name = input("name") > > if name == "Pete": > greeting = "Hi" > else: > greeting = "Hello!" > > print(f""" > > > {greeting} {name}! > > > """) > > I'd like to allow them start writing web-apps without introducing > functions first (most web-frameworks require functions). > input() and print() *are* functions. And they are not even the simplest possible functions as they require arguments. Since input and print are not normally used that way in web apps, I would use the appropriate functions from a web framework. > It occurred to me that it's not hard to create a wrapper, which presents > this code as a web-app (input would be patched to look up GET or POST > parameters with given name). > Python's input() function is something that interactively prompts the user for input, generally asking a question and expecting the user to enter an answer. If you patch it to use a GET or POST, you transform it into something that is no longer interactive, but passively read from some other source. Brython (a web-based Python implementation) uses a javascript prompt() as a hook for Python's input - thus reproducing the intent of the input() function. > This approach would allow simple debugging of the code on local machine > and no extra libraries are required in this phase. > > Any opinions on this? > My first impression is that wanting to have students write web apps as their introduction to Python is needlessly complicating things for them as it tries to do too much all at once. My preferred approach is based on Pattis's Karel the robot which *starts* with simple functions, requiring no arguments, and build from there. (See http://reeborg.ca/reeborg.html for an example; tutorial at http://reeborg.ca/docs/en/.) > Has this been tried before? > Not that I aware of. Best of luck, Andr? > best regards, > Aivar > > _______________________________________________ > Edu-sig mailing list > Edu-sig at python.org > https://mail.python.org/mailman/listinfo/edu-sig > > -------------- next part -------------- An HTML attachment was scrubbed... URL: From sebastian at fuentelibre.org Wed Mar 28 09:33:46 2018 From: sebastian at fuentelibre.org (Sebastian Silva) Date: Wed, 28 Mar 2018 08:33:46 -0500 Subject: [Edu-sig] Simplest webapps In-Reply-To: <4bee909c-1437-4ed9-57b7-ce2dd709e0d2@ut.ee> References: <4bee909c-1437-4ed9-57b7-ce2dd709e0d2@ut.ee> Message-ID: <41f2424c-9cf0-17b1-a35f-dfdc4122c118@fuentelibre.org> Hi, I wrote a Python IDE / runner for the web, that supports the code you wrote as-is: https://educa.juegos/ As Andre Roberge, `input` works like `prompt` in Javascript. You can try copy pasting the code in the IDE - your feedback is welcome at the repository . It will be hard to avoid functions in Javascript since it wants to use callback functions all the time. Regards, Sebastian On 28/03/18 02:18, Aivar Annamaa wrote: > > Hi! > > Let's say my students are able to write programs like this: > > name = input("name") > > if name == "Pete": > ??? greeting = "Hi" > else: > ??? greeting = "Hello!" > > print(f""" > > > {greeting} {name}! > > > """) > > I'd like to allow them start writing web-apps without introducing > functions first (most web-frameworks require functions). > > It occurred to me that it's not hard to create a wrapper, which > presents this code as a web-app (input would be patched to look up GET > or POST parameters with given name). > > This approach would allow simple debugging of the code on local > machine and no extra libraries are required in this phase. > > Any opinions on this? Has this been tried before? > > best regards, > Aivar > > > > _______________________________________________ > Edu-sig mailing list > Edu-sig at python.org > https://mail.python.org/mailman/listinfo/edu-sig -------------- next part -------------- An HTML attachment was scrubbed... URL: From kirby.urner at gmail.com Fri Mar 30 14:05:38 2018 From: kirby.urner at gmail.com (kirby urner) Date: Fri, 30 Mar 2018 11:05:38 -0700 Subject: [Edu-sig] Simplest webapps In-Reply-To: <4bee909c-1437-4ed9-57b7-ce2dd709e0d2@ut.ee> References: <4bee909c-1437-4ed9-57b7-ce2dd709e0d2@ut.ee> Message-ID: Hi Aivar -- I think it's a fine idea to write simple Python scripts that write HTML files, which you may then pull up in the browser. There's no need to put a server behind static web pages. So, for example, I'll have my students write a page of bookmarks: # -*- coding: utf-8 -*- """ Created on Wed Nov 4 18:02:30 2015 @author: Kirby Urner """ # tuple of tuples bookmarks = ( ("Anaconda.org", "http://anaconda.org"), ("Python.org", "http://python.org"), ("Python Docs", "https://docs.python.org/3/"), ("Spaghetti Code", "http://c2.com/cgi/wiki?SpaghettiCode"), ("Structured Programming", "http://c2.com/cgi/wiki?StructuredProgramming "), ("Map of Languages", " http://archive.oreilly.com/pub/a/oreilly//news/languageposter_0504.html"), ("XKCD", "http://xkcd.com"), ) page = '''\ {} ''' html = """\ Bookmarks for Python

Bookmarks


    {}
""".lower() the_body = "" for place, url in bookmarks: the_body += "
  • {}
    • \n".format(url, place) webpage = open("links.html", "w") print(page.format(html.format(the_body)), file=webpage) webpage.close() All you need add to your example is using print() to save to a file, so the browser has something to open. I would not call this a "web app" yet it's instructive in showing how Python can write HTML files. Kirby On Wed, Mar 28, 2018 at 12:18 AM, Aivar Annamaa wrote: > Hi! > Let's say my students are able to write programs like this: > > name = input("name") > > if name == "Pete": > greeting = "Hi" > else: > greeting = "Hello!" > > print(f""" > > > {greeting} {name}! > > > """) > > I'd like to allow them start writing web-apps without introducing > functions first (most web-frameworks require functions). > > It occurred to me that it's not hard to create a wrapper, which presents > this code as a web-app (input would be patched to look up GET or POST > parameters with given name). > > This approach would allow simple debugging of the code on local machine > and no extra libraries are required in this phase. > > Any opinions on this? Has this been tried before? > > best regards, > Aivar > > _______________________________________________ > Edu-sig mailing list > Edu-sig at python.org > https://mail.python.org/mailman/listinfo/edu-sig > > -------------- next part -------------- An HTML attachment was scrubbed... URL: From kirby.urner at gmail.com Fri Mar 30 15:02:06 2018 From: kirby.urner at gmail.com (kirby urner) Date: Fri, 30 Mar 2018 12:02:06 -0700 Subject: [Edu-sig] Simplest webapps In-Reply-To: References: <4bee909c-1437-4ed9-57b7-ce2dd709e0d2@ut.ee> Message-ID: Very interesting. I note that free users are relegated to Python 2.7 Server modules can be Python 3.6 (outside the free version) Client stuff compiles to JavaScript and is approximately 2.7 That's a bit confusing maybe. I try to avoid 2.7 but that's not easy. In my Coding with Kids work, we use Codesters.com to teach Python, which depends on Skulpt. Also 2.x ish. Kirby On Fri, Mar 30, 2018 at 11:49 AM, Jason Blum wrote: > http://anvil.works/ is a pretty interesting approach to Python web > applications. > > On Fri, Mar 30, 2018 at 2:05 PM, kirby urner > wrote: > >> >> Hi Aivar -- >> >> I think it's a fine idea to write simple Python scripts that write HTML >> files, which you may then pull up in the browser. >> >> There's no need to put a server behind static web pages. So, for >> example, I'll have my students write a page of bookmarks: >> >> # -*- coding: utf-8 -*- >> """ >> Created on Wed Nov 4 18:02:30 2015 >> >> @author: Kirby Urner >> """ >> >> # tuple of tuples >> bookmarks = ( >> ("Anaconda.org", "http://anaconda.org"), >> ("Python.org", "http://python.org"), >> ("Python Docs", "https://docs.python.org/3/"), >> ("Spaghetti Code", "http://c2.com/cgi/wiki?SpaghettiCode"), >> ("Structured Programming", "http://c2.com/cgi/wiki?Struct >> uredProgramming"), >> ("Map of Languages", "http://archive.oreilly.com/pu >> b/a/oreilly//news/languageposter_0504.html"), >> ("XKCD", "http://xkcd.com"), >> ) >> >> page = '''\ >> >> {} >> ''' >> >> html = """\ >> >> >> Bookmarks for Python >> >> >>

    Bookmarks

    >>
    >>
      >> {} >>
    >> >> >> """.lower() >> >> the_body = "" >> for place, url in bookmarks: >> the_body += "
  • {}
    • \n".format(url, place) >> >> webpage = open("links.html", "w") >> print(page.format(html.format(the_body)), file=webpage) >> webpage.close() >> >> All you need add to your example is using print() to save to a file, so >> the browser has something to open. >> >> I would not call this a "web app" yet it's instructive in showing how >> Python can write HTML files. >> >> Kirby >> >> >> >> On Wed, Mar 28, 2018 at 12:18 AM, Aivar Annamaa >> wrote: >> >>> Hi! >>> Let's say my students are able to write programs like this: >>> >>> name = input("name") >>> >>> if name == "Pete": >>> greeting = "Hi" >>> else: >>> greeting = "Hello!" >>> >>> print(f""" >>> >>> >>> {greeting} {name}! >>> >>> >>> """) >>> >>> I'd like to allow them start writing web-apps without introducing >>> functions first (most web-frameworks require functions). >>> >>> It occurred to me that it's not hard to create a wrapper, which presents >>> this code as a web-app (input would be patched to look up GET or POST >>> parameters with given name). >>> >>> This approach would allow simple debugging of the code on local machine >>> and no extra libraries are required in this phase. >>> >>> Any opinions on this? Has this been tried before? >>> >>> best regards, >>> Aivar >>> >>> _______________________________________________ >>> Edu-sig mailing list >>> Edu-sig at python.org >>> https://mail.python.org/mailman/listinfo/edu-sig >>> >>> >> >> _______________________________________________ >> Edu-sig mailing list >> Edu-sig at python.org >> https://mail.python.org/mailman/listinfo/edu-sig >> >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: From jason.blum at gmail.com Fri Mar 30 14:49:02 2018 From: jason.blum at gmail.com (Jason Blum) Date: Fri, 30 Mar 2018 14:49:02 -0400 Subject: [Edu-sig] Simplest webapps In-Reply-To: References: <4bee909c-1437-4ed9-57b7-ce2dd709e0d2@ut.ee> Message-ID: http://anvil.works/ is a pretty interesting approach to Python web applications. On Fri, Mar 30, 2018 at 2:05 PM, kirby urner wrote: > > Hi Aivar -- > > I think it's a fine idea to write simple Python scripts that write HTML > files, which you may then pull up in the browser. > > There's no need to put a server behind static web pages. So, for example, > I'll have my students write a page of bookmarks: > > # -*- coding: utf-8 -*- > """ > Created on Wed Nov 4 18:02:30 2015 > > @author: Kirby Urner > """ > > # tuple of tuples > bookmarks = ( > ("Anaconda.org", "http://anaconda.org"), > ("Python.org", "http://python.org"), > ("Python Docs", "https://docs.python.org/3/"), > ("Spaghetti Code", "http://c2.com/cgi/wiki?SpaghettiCode"), > ("Structured Programming", "http://c2.com/cgi/wiki? > StructuredProgramming"), > ("Map of Languages", "http://archive.oreilly.com/pub/a/oreilly//news/ > languageposter_0504.html"), > ("XKCD", "http://xkcd.com"), > ) > > page = '''\ > > {} > ''' > > html = """\ > > > Bookmarks for Python > > >

    Bookmarks

    >
    >
      > {} >
    > > > """.lower() > > the_body = "" > for place, url in bookmarks: > the_body += "
  • {}
    • \n".format(url, place) > > webpage = open("links.html", "w") > print(page.format(html.format(the_body)), file=webpage) > webpage.close() > > All you need add to your example is using print() to save to a file, so > the browser has something to open. > > I would not call this a "web app" yet it's instructive in showing how > Python can write HTML files. > > Kirby > > > > On Wed, Mar 28, 2018 at 12:18 AM, Aivar Annamaa > wrote: > >> Hi! >> Let's say my students are able to write programs like this: >> >> name = input("name") >> >> if name == "Pete": >> greeting = "Hi" >> else: >> greeting = "Hello!" >> >> print(f""" >> >> >> {greeting} {name}! >> >> >> """) >> >> I'd like to allow them start writing web-apps without introducing >> functions first (most web-frameworks require functions). >> >> It occurred to me that it's not hard to create a wrapper, which presents >> this code as a web-app (input would be patched to look up GET or POST >> parameters with given name). >> >> This approach would allow simple debugging of the code on local machine >> and no extra libraries are required in this phase. >> >> Any opinions on this? Has this been tried before? >> >> best regards, >> Aivar >> >> _______________________________________________ >> Edu-sig mailing list >> Edu-sig at python.org >> https://mail.python.org/mailman/listinfo/edu-sig >> >> > > _______________________________________________ > Edu-sig mailing list > Edu-sig at python.org > https://mail.python.org/mailman/listinfo/edu-sig > > -------------- next part -------------- An HTML attachment was scrubbed... URL: From perrygrossman2008 at gmail.com Fri Mar 30 16:26:02 2018 From: perrygrossman2008 at gmail.com (Perry Grossman) Date: Fri, 30 Mar 2018 16:26:02 -0400 Subject: [Edu-sig] probability and statistics demo for kids In-Reply-To: References: Message-ID: Hi All, Thanks for the great comments. Sorry for the delay. I have reviewed most of the materials and will review more. I drafted a presentation plan for next Friday here: https://docs.google.com/document/d/1MNIwqjJ2kVS80zy69606TEPLZGy_e-5W0Ae7L5BeaNE/edit?usp=sharing If you have any more comments let me know. Perry On Sat, Feb 24, 2018 at 9:28 PM, kirby urner wrote: > > > On Sat, Feb 24, 2018 at 5:21 PM, Wes Turner wrote: > >> >> >> +1. "Python Data Science Handbook" (by Jake VanderPlas) is available in >> print and as free Jupyter notebooks: >> https://github.com/jakevdp/PythonDataScienceHandbook >> >> It covers IPython, NumPy, Pandas, Matplotlib, and Scikit-Learn. >> >> >> > > ?Yes! Open on my desk in front of me. > > Kirby > > > -- PerryGrossman2008 at gmail.com (617) 383-9061 -------------- next part -------------- An HTML attachment was scrubbed... URL: From wes.turner at gmail.com Sat Mar 31 20:16:51 2018 From: wes.turner at gmail.com (Wes Turner) Date: Sat, 31 Mar 2018 20:16:51 -0400 Subject: [Edu-sig] Simplest webapps In-Reply-To: References: <4bee909c-1437-4ed9-57b7-ce2dd709e0d2@ut.ee> Message-ID: Bottle is a single file web microframework. https://github.com/bottlepy/bottle https://github.com/bottlepy/bottle/blob/master/bottle.py > Example: "Hello World" in a bottle ```python from bottle import route, run, template @route('/hello/') def index(name): return template('Hello {{name}}!', name=name) run(host='localhost', port=8080) ``` There are docs and every function is Ctrl-F'able within bottle.py. On Friday, March 30, 2018, kirby urner wrote: > > Very interesting. I note that free users are relegated to Python 2.7 > > Server modules can be Python 3.6 (outside the free version) > > Client stuff compiles to JavaScript and is approximately 2.7 > > That's a bit confusing maybe. I try to avoid 2.7 but that's not easy. > > In my Coding with Kids work, we use Codesters.com to teach Python, which > depends on Skulpt. Also 2.x ish. > > Kirby > > > > On Fri, Mar 30, 2018 at 11:49 AM, Jason Blum wrote: > >> http://anvil.works/ is a pretty interesting approach to Python web >> applications. >> >> On Fri, Mar 30, 2018 at 2:05 PM, kirby urner >> wrote: >> >>> >>> Hi Aivar -- >>> >>> I think it's a fine idea to write simple Python scripts that write HTML >>> files, which you may then pull up in the browser. >>> >>> There's no need to put a server behind static web pages. So, for >>> example, I'll have my students write a page of bookmarks: >>> >>> # -*- coding: utf-8 -*- >>> """ >>> Created on Wed Nov 4 18:02:30 2015 >>> >>> @author: Kirby Urner >>> """ >>> >>> # tuple of tuples >>> bookmarks = ( >>> ("Anaconda.org", "http://anaconda.org"), >>> ("Python.org", "http://python.org"), >>> ("Python Docs", "https://docs.python.org/3/"), >>> ("Spaghetti Code", "http://c2.com/cgi/wiki?SpaghettiCode"), >>> ("Structured Programming", "http://c2.com/cgi/wiki?Struct >>> uredProgramming"), >>> ("Map of Languages", "http://archive.oreilly.com/pu >>> b/a/oreilly//news/languageposter_0504.html"), >>> ("XKCD", "http://xkcd.com"), >>> ) >>> >>> page = '''\ >>> >>> {} >>> ''' >>> >>> html = """\ >>> >>> >>> Bookmarks for Python >>> >>> >>>

    Bookmarks

    >>>
    >>>
      >>> {} >>>
    >>> >>> >>> """.lower() >>> >>> the_body = "" >>> for place, url in bookmarks: >>> the_body += "
  • {}
    • \n".format(url, place) >>> >>> webpage = open("links.html", "w") >>> print(page.format(html.format(the_body)), file=webpage) >>> webpage.close() >>> >>> All you need add to your example is using print() to save to a file, so >>> the browser has something to open. >>> >>> I would not call this a "web app" yet it's instructive in showing how >>> Python can write HTML files. >>> >>> Kirby >>> >>> >>> >>> On Wed, Mar 28, 2018 at 12:18 AM, Aivar Annamaa >>> wrote: >>> >>>> Hi! >>>> Let's say my students are able to write programs like this: >>>> >>>> name = input("name") >>>> >>>> if name == "Pete": >>>> greeting = "Hi" >>>> else: >>>> greeting = "Hello!" >>>> >>>> print(f""" >>>> >>>> >>>> {greeting} {name}! >>>> >>>> >>>> """) >>>> >>>> I'd like to allow them start writing web-apps without introducing >>>> functions first (most web-frameworks require functions). >>>> >>>> It occurred to me that it's not hard to create a wrapper, which >>>> presents this code as a web-app (input would be patched to look up GET >>>> or POST parameters with given name). >>>> >>>> This approach would allow simple debugging of the code on local machine >>>> and no extra libraries are required in this phase. >>>> >>>> Any opinions on this? Has this been tried before? >>>> >>>> best regards, >>>> Aivar >>>> >>>> _______________________________________________ >>>> Edu-sig mailing list >>>> Edu-sig at python.org >>>> https://mail.python.org/mailman/listinfo/edu-sig >>>> >>>> >>> >>> _______________________________________________ >>> Edu-sig mailing list >>> Edu-sig at python.org >>> https://mail.python.org/mailman/listinfo/edu-sig >>> >>> >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: From wes.turner at gmail.com Sat Mar 31 20:20:57 2018 From: wes.turner at gmail.com (Wes Turner) Date: Sat, 31 Mar 2018 20:20:57 -0400 Subject: [Edu-sig] Simplest webapps In-Reply-To: References: <4bee909c-1437-4ed9-57b7-ce2dd709e0d2@ut.ee> Message-ID: Web programming is fun but dangerous. Things as simple as 'it reads a file off the disk and sends it to the user' can unintentionally expose every readable file to whoever or whatever can access localhost. ```python os.path.join('here', '/etc/shadow') path = 'here/' + '../../../../etc/shadow' ``` All of the examples in this thread are susceptible to XSS (Cross Site Scripting) and CSRF (Cross-site Request Forgery). Don't feel bad; many college web programming courses teach dangerous methods, too. XSS: ``` x = """""" return f'{x}' """ Bottle has multiple templating engines which escape user-supplied input (in order to maintain a separation between data and code). Like XSS, SQLi is also a 'code injection' issue. pypi:Records can use SQLAlchemy. Django is a great framework with a built-in ORM that also escapes SQL queries. CSRF: - X posts an XSS to site A that POSTs to site B - 100 users view site A - [...] http://bottle-utils.readthedocs.io/en/latest/csrf.html https://bottlepy.org/docs/dev/tutorial.html#html-form-handling OWASP has a lot of information on WebSec: OWASP Top 10 https://www.owasp.org/index.php/Category:OWASP_Top_Ten_Project The OWASP Vulnerable Web Applications Directory Project (VWAD) https://github.com/OWASP/OWASP-VWAD Any program or user on the system can read and write to localhost. On Saturday, March 31, 2018, Wes Turner wrote: > Bottle is a single file web microframework. > > https://github.com/bottlepy/bottle > https://github.com/bottlepy/bottle/blob/master/bottle.py > > > Example: "Hello World" in a bottle > > ```python > from bottle import route, run, template > > @route('/hello/') > def index(name): > return template('Hello {{name}}!', > name=name) > > run(host='localhost', port=8080) > ``` > > There are docs and every function is Ctrl-F'able within bottle.py. > > On Friday, March 30, 2018, kirby urner wrote: > >> >> Very interesting. I note that free users are relegated to Python 2.7 >> >> Server modules can be Python 3.6 (outside the free version) >> >> Client stuff compiles to JavaScript and is approximately 2.7 >> >> That's a bit confusing maybe. I try to avoid 2.7 but that's not easy. >> >> In my Coding with Kids work, we use Codesters.com to teach Python, which >> depends on Skulpt. Also 2.x ish. >> >> Kirby >> >> >> >> On Fri, Mar 30, 2018 at 11:49 AM, Jason Blum >> wrote: >> >>> http://anvil.works/ is a pretty interesting approach to Python web >>> applications. >>> >>> On Fri, Mar 30, 2018 at 2:05 PM, kirby urner >>> wrote: >>> >>>> >>>> Hi Aivar -- >>>> >>>> I think it's a fine idea to write simple Python scripts that write HTML >>>> files, which you may then pull up in the browser. >>>> >>>> There's no need to put a server behind static web pages. So, for >>>> example, I'll have my students write a page of bookmarks: >>>> >>>> # -*- coding: utf-8 -*- >>>> """ >>>> Created on Wed Nov 4 18:02:30 2015 >>>> >>>> @author: Kirby Urner >>>> """ >>>> >>>> # tuple of tuples >>>> bookmarks = ( >>>> ("Anaconda.org", "http://anaconda.org"), >>>> ("Python.org", "http://python.org"), >>>> ("Python Docs", "https://docs.python.org/3/"), >>>> ("Spaghetti Code", "http://c2.com/cgi/wiki?SpaghettiCode"), >>>> ("Structured Programming", "http://c2.com/cgi/wiki?Struct >>>> uredProgramming"), >>>> ("Map of Languages", "http://archive.oreilly.com/pu >>>> b/a/oreilly//news/languageposter_0504.html"), >>>> ("XKCD", "http://xkcd.com"), >>>> ) >>>> >>>> page = '''\ >>>> >>>> {} >>>> ''' >>>> >>>> html = """\ >>>> >>>> >>>> Bookmarks for Python >>>> >>>> >>>>

    Bookmarks

    >>>>
    >>>>
      >>>> {} >>>>
    >>>> >>>> >>>> """.lower() >>>> >>>> the_body = "" >>>> for place, url in bookmarks: >>>> the_body += "
  • {}
    • \n".format(url, place) >>>> >>>> webpage = open("links.html", "w") >>>> print(page.format(html.format(the_body)), file=webpage) >>>> webpage.close() >>>> >>>> All you need add to your example is using print() to save to a file, so >>>> the browser has something to open. >>>> >>>> I would not call this a "web app" yet it's instructive in showing how >>>> Python can write HTML files. >>>> >>>> Kirby >>>> >>>> >>>> >>>> On Wed, Mar 28, 2018 at 12:18 AM, Aivar Annamaa >>>> wrote: >>>> >>>>> Hi! >>>>> Let's say my students are able to write programs like this: >>>>> >>>>> name = input("name") >>>>> >>>>> if name == "Pete": >>>>> greeting = "Hi" >>>>> else: >>>>> greeting = "Hello!" >>>>> >>>>> print(f""" >>>>> >>>>> >>>>> {greeting} {name}! >>>>> >>>>> >>>>> """) >>>>> >>>>> I'd like to allow them start writing web-apps without introducing >>>>> functions first (most web-frameworks require functions). >>>>> >>>>> It occurred to me that it's not hard to create a wrapper, which >>>>> presents this code as a web-app (input would be patched to look up >>>>> GET or POST parameters with given name). >>>>> >>>>> This approach would allow simple debugging of the code on local >>>>> machine and no extra libraries are required in this phase. >>>>> >>>>> Any opinions on this? Has this been tried before? >>>>> >>>>> best regards, >>>>> Aivar >>>>> >>>>> _______________________________________________ >>>>> Edu-sig mailing list >>>>> Edu-sig at python.org >>>>> https://mail.python.org/mailman/listinfo/edu-sig >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> Edu-sig mailing list >>>> Edu-sig at python.org >>>> https://mail.python.org/mailman/listinfo/edu-sig >>>> >>>> >>> >> -------------- next part -------------- An HTML attachment was scrubbed... URL: