[Tutor] Tutor Digest, Vol 88, Issue 53

[Jacob Bender]

Thanks, and I'll try those.

On Wed, Jun 15, 2011 at 12:47 AM, <tutor-request at python.org> wrote:

> Send Tutor mailing list submissions to
>        tutor at python.org
>
> To subscribe or unsubscribe via the World Wide Web, visit
>        http://mail.python.org/mailman/listinfo/tutor
> or, via email, send a message with subject or body 'help' to
>        tutor-request at python.org
>
> You can reach the person managing the list at
>        tutor-owner at python.org
>
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of Tutor digest..."
>
>
> Today's Topics:
>
>   1. Communicating Between Programs Using Raw Inputs (Jacob Bender)
>   2. Re: Break stament issue (Steven D'Aprano)
>   3. Re: Communicating Between Programs Using Raw Inputs
>      (Steven D'Aprano)
>   4. Re: Communicating Between Programs Using Raw Inputs
>      (Steve Willoughby)
>   5. Re: Communicating Between Programs Using Raw Inputs (Alan Gauld)
>   6. Re: Communicating Between Programs Using Raw Inputs
>      (Steve Willoughby)
>   7. Already Initialized Object Inheritance? (WolfRage)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 14 Jun 2011 17:39:03 -0400
> From: Jacob Bender <benderjacob44 at gmail.com>
> To: Python Tutor <tutor at python.org>
> Subject: [Tutor] Communicating Between Programs Using Raw Inputs
> Message-ID: <BANLkTi=gWb4HRvkJ0QdrjpMWEP6OMzmAAg at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear Python Tutors,
>
> I was wondering how to break into my one program I made using brute force
> methods. Here's the code:
>
> password = "Helloworld"
> try= raw_input("What's the password?")
> while try != password:
>     try = raw_input("Incorrect, what's the password?")
>
> I know how to do it in the command line, but not through another program.
> Generating the random tries for the password isn't the issue, but entering
> the password(s) in between the two programs is an issue because I don't
> know
> how to make programs communicate through raw inputs.
>
> Thanks!
> -------------- next part --------------
> An HTML attachment was scrubbed...
> URL: <
> http://mail.python.org/pipermail/tutor/attachments/20110614/0c5ecf31/attachment-0001.html
> >
>
> ------------------------------
>
> Message: 2
> Date: Wed, 15 Jun 2011 08:40:26 +1000
> From: Steven D'Aprano <steve at pearwood.info>
> To: tutor at python.org
> Subject: Re: [Tutor] Break stament issue
> Message-ID: <4DF7E35A.1080908 at pearwood.info>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Susana Iraiis Delgado Rodriguez wrote:
> > Hello members!
> >
> > I'm doing a script that needs to loop to get some information, in order
> to
> > do that I'm using modules from OGR and Mapnik. These to get data from
> > shapefiles, but some of the files have 0 elements, I wrote a line to
> > validate it, but it hasn't worked, so I added a break to keep working.
> When
> > I run the scipt I got the next error:
> > Traceback (most recent call last):
> >   File "<pyshell#0>", line 1, in <module>
> >     import mapnik_punto_sin_duda
> >   File "C:\Python26\mapnik_punto_sin_duda.py", line 23
> >     break
> >    ^
> > IndentationError: unexpected indent
>
> This error has nothing to do with break. Look at the error message, and
> the position of the ^ mark: the error occurs *before* the break
> statement, in the indentation.
>
> I can duplicate the error in Python 2.6 with this:
>
>
>  >>> for t in (1, 2, 3):
> ...     print t  # four spaces
> ...     break  # one tab
>   File "<stdin>", line 3
>     break  # one tab
>     ^
> IndentationError: unexpected indent
>
>
> Newer versions of Python give more helpful error messages: Python 3
> reports "TabError: inconsistent use of tabs and spaces in indentation".
>
>
> You can fix this by using the tabnanny script supplied with Python. From
> the shell (not Python's interactive interpreter!) or the DOS prompt, run:
>
> python -m tabnanny -v <path to your file>
>
> replacing <path to your file> with the actual filename, and see what it
> says.
>
>
> --
> Steven
>
>
> ------------------------------
>
> Message: 3
> Date: Wed, 15 Jun 2011 08:48:49 +1000
> From: Steven D'Aprano <steve at pearwood.info>
> To: Python Tutor <tutor at python.org>
> Subject: Re: [Tutor] Communicating Between Programs Using Raw Inputs
> Message-ID: <4DF7E <4DF7E551.6080204 at pearwood.info>551.6080204@
> pearwood.info>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Jacob Bender wrote:
> > Dear Python Tutors,
> >
> > I was wondering how to break into my one program I made using brute force
> > methods. Here's the code:
> >
> > password = "Helloworld"
> > try= raw_input("What's the password?")
> > while try != password:
> >      try = raw_input("Incorrect, what's the password?")
> >
> > I know how to do it in the command line, but not through another program.
> > Generating the random tries for the password isn't the issue, but
> entering
> > the password(s) in between the two programs is an issue because I don't
> know
> > how to make programs communicate through raw inputs.
>
>
> Normally you would do this by redirecting standard input. What operating
> system are you using? In Linux, you would do something like:
>
>
> # run script foo.py taking input from the output of bar.py
> foo.py < bar.py
>
>
> at the shell. I don't know how to do it in DOS.
>
> However, I don't know if this will actually work for raw_input. It may
> not. Try it and see.
>
> Perhaps a better way is to have your program accept a user name and
> password on the command line, and only prompt for them if not given.
> Then you can say:
>
> foo.py --user=fred --password="y8Mr3 at hzi"
>
>
> Hope this helps,
>
>
>
> --
> Steven
>
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 14 Jun 2011 15:54:20 -0700
> From: Steve Willoughby <steve at alchemy.com>
> To: tutor at python.org
> Subject: Re: [Tutor] Communicating Between Programs Using Raw Inputs
> Message-ID: <4DF7E69C.6000406 at alchemy.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> On 14-Jun-11 15:48, Steven D'Aprano wrote:
>
> > Normally you would do this by redirecting standard input. What operating
> > system are you using? In Linux, you would do something like:
> >
> >
> > # run script foo.py taking input from the output of bar.py
> > foo.py < bar.py
>
> Actually, no, that will send the *source code* of bar.py as the input to
> foo.py.  I think you mean:
>
> bar.py | foo.py
>
> which also should work in DOS as well (although less efficiently).
>
> > However, I don't know if this will actually work for raw_input. It may
> > not. Try it and see.
>
> It should.
>
> >
> > Perhaps a better way is to have your program accept a user name and
> > password on the command line, and only prompt for them if not given.
> > Then you can say:
> >
> > foo.py --user=fred --password="y8Mr3 at hzi"
>
> This is one way.  Another would be to use the subprocess module in
> Python which will let one program invoke another program, and have a
> file-like object on which it can write data, which the child program
> will see as its standard input (and read in to raw_input).
>
> --
> Steve Willoughby / steve at alchemy.com
> "A ship in harbor is safe, but that is not what ships are built for."
> PGP Fingerprint 4615 3CCE 0F29 AE6C 8FF4 CA01 73FE 997A 765D 696C
>
>
> ------------------------------
>
> Message: 5
> Date: Wed, 15 Jun 2011 00:36:13 +0100
> From: "Alan Gauld" <alan.gauld at btinternet.com>
> To: tutor at python.org
> Subject: Re: [Tutor] Communicating Between Programs Using Raw Inputs
> Message-ID: <it8r9f$unn$1 at dough.gmane.org>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>        reply-type=original
>
>
> "Jacob Bender" <benderjacob44 at gmail.com> wrote
>
> > I know how to do it in the command line, but not through another
> > program.
> > Generating the random tries for the password isn't the issue, but
> > entering
> > the password(s) in between the two programs is an issue because I
> > don't know
> > how to make programs communicate through raw inputs.
>
> You need to search for stdin and stdout. Try wikipedia.
> Then google python stdin
>
> By linking stdout of one program to stdin of another you can pass
> data between them. This is one of the things that makes Unix
> such an insanely great programmers OS, its commands are
> explicitly designed to do this. But you can make it work with
> any command that prints to stdout and reads from stdin.
>
> If you read the "Talking to the User" topic in my tutorial you
> will see a sidebar/box that discusses this and gives an example
> of reading from a file. You need to take that one step further and
> read from a process. In Unix the easiest way you can do that is
> to surround the command with backtick marks:
>
> python reader.py < `python writer.py`
>
> notice the *back* quote marks.
>
> There are other ways of doing it inside Python, seee my
> "Using the OS" topic for those. But backtics and stdin should
> do what you need.
>
> HTH,
>
> --
> Alan Gauld
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
>
>
>
>
> ------------------------------
>
> Message: 6
> Date: Tue, 14 Jun 2011 16:46:10 -0700
> From: Steve Willoughby <steve at alchemy.com>
> To: tutor at python.org
> Subject: Re: [Tutor] Communicating Between Programs Using Raw Inputs
> Message-ID: <4DF7F2C2.7020104 at alchemy.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> As always, Alan has given a lot of great advice and useful information.
>  There's just one piece at the end I would question, however:
>
>
> On 14-Jun-11 16:36, Alan Gauld wrote:
>  > python reader.py < `python writer.py`
>
> Almost, but not quite.  The backticks mean the command is executed and
> the output substituted back on the command line.  The < bracket means to
> take what follows it as a file NAME (not a data stream).  So unless
> writer.py outputs a filename, you really want something like
>
> python writer.py | python reader.py
>
>
>
> --
> Steve Willoughby / steve at alchemy.com
> "A ship in harbor is safe, but that is not what ships are built for."
> PGP Fingerprint 4615 3CCE 0F29 AE6C 8FF4 CA01 73FE 997A 765D 696C
>
>
> ------------------------------
>
> Message: 7
> Date: Tue, 14 Jun 2011 21:47:27 -0700
> From: WolfRage <wolfrage8765 at gmail.com>
> To: Python Tutor <tutor at python.org>
> Subject: [Tutor] Already Initialized Object Inheritance?
> Message-ID: <1308113247.1952.45.camel at wolfrage-LE1600>
> Content-Type: text/plain; charset="UTF-8"
>
> I can not get this to behave in the manor that I would like. I am trying
> to have an object refereed to as CursesApp.Screen become the already
> initialized object "stdscr". To elaborate I would like it to become that
> object but to also be able to define additional methods and properties,
> so more along the lines of inherit from "stdscr". Is this even possible?
> Well I can make it equal to that object I can not add additional methods
> and properties to it? Additionally, so that I learn; where has my
> thinking been too short sited? Thank you for your help.
> --
> Jordan
>
> ****CODE BELOW****
>
> #!/usr/bin/python3
> """With thi method I can make the class "Screen" become "stdscr" but if
> I refernce any of the new methods or properties the applications
> promptly fails and notifies me that the method or property does not
> exist. Another downside of this method is I can not reference
> self.Screen.* or it crashes."""
> import curses
> class CursesApp:
>    def __init__(self, stdscr):
>        self.Screen(stdscr) #This is the stdscr object.
>        curses.init_pair(1,curses.COLOR_BLUE,curses.COLOR_YELLOW)
>        #self.Screen.bkgd(' ', curses.color_pair(1))
>        #self.mainLoop()
>
>    #def mainLoop(self):
>        #while 1:
>            #self.Screen.refresh()
>            #key=self.Screen.getch()
>            #if key==ord('q'): break
>
>    class Screen:
>        def __init__(self,stdscr):
>            self=stdscr
>            #self.height, self.width = self.getmaxyx() # any reference
> to these crashes
>            #self.offsety, self.offsetx = -self.height/2, -self.width/2
> # any reference to these crashes
>            #self.curx, self.cury = 1, 1 # any reference to these
> crashes
>            self.clear()
>            self.border(0)
>            while 1:
>                self.refresh()
>                key=self.getch()
>                if key==ord('q'): break
>
> def main():
>    cursesapp = curses.wrapper(setup)
>
> def setup(stdscr):
>    CursesApp(stdscr)
>
> if __name__ == '__main__':
>    main()
>
>
>
> ****CODE BELOW****
>
> #!/usr/bin/python3
> """With this method I can make "Screen" become "stdscr" but if I
> obviously can not even define any new methods or properties. But atleast
> the references can be used through out the class with out crashing."""
> import curses
> class CursesApp:
>    def __init__(self, stdscr):
>        self.Screen=stdscr #This is the stdscr object.
>        curses.init_pair(1,curses.COLOR_BLUE,curses.COLOR_YELLOW)
>        self.Screen.bkgd(' ', curses.color_pair(1))
>        self.mainLoop()
>
>    def mainLoop(self):
>        while 1:
>            self.Screen.refresh()
>            key=self.Screen.getch()
>            if key==ord('q'): break
>
> def main():
>    cursesapp = curses.wrapper(setup)
>
> def setup(stdscr):
>    CursesApp(stdscr)
>
> if __name__ == '__main__':
>    main()
>
>
>
> ------------------------------
>
> _______________________________________________
> Tutor maillist  -  Tutor at python.org
> http://mail.python.org/mailman/listinfo/tutor
>
>
> End of Tutor Digest, Vol 88, Issue 53
> *************************************
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/tutor/attachments/20110615/d2d83e77/attachment-0001.html>