docs December 2021

docs@python.org

14 participants
12 discussions

Bug in Python.
by Prakash Mudholkar 07 Feb '22

07 Feb '22

Hello - I wish to bring to your kind notice a bug in Python. Given any matrix X. While trying to compute the CoVariance matrix of that matrix X, Python does NOT compute the CoVarianceof the given matrix X. Instead, Python comptes the CoVariance of the Transpose of the given matrix X. This appears to be a bug in Python. Please refer to the below website for a given matrix and what the result should be after the computation of it's CoVariance. And I have provided a screenshot of what Python is returning. https://www.itl.nist.gov/div898/handbook/pmc/section5/pmc541.htm Please let me know if you have any questions. Regards, Prakash

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https://docs.python.org/es/3/library/
by t132654 31 Dec '21

31 Dec '21

Good day. I would like to make a suggestion for improvement on how the documentation page works. The left panel where the content tree is displayed should move independently of the right panel where the selected content is displayed, so that selecting new content in the left panel does not require scrolling to the top of the page. Thanks for your attention. Happy holidays and best regards. Ramón.

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Request a missing feature
by Avichal Kumar 31 Dec '21

31 Dec '21

Hello sir I am a python learning student, I found some missing feature in matplotlib.pyplot I'm using python in vscode, and i wanted to run two code at same time, when I'm trying to do then firstly I need to close that figure which is printed the print next, but i can't run two matplotlib code at same time, but i wanted to see both figure at same time, this is the missing feature that i found, I can send you video also

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documentation error?
by Sean Carter 31 Dec '21

31 Dec '21

In section 9.3.5. Class and Instance Variables, it makes a distinction between class and instance variables that doesn't look completely right. It looks to me like what's going on is that class variables are bound when the interpreter gets to that class, kind of like default parameters to functions, and then a copy of the class variable is created when the class is instantiated. BUT, in the case of a list, it's a shallow copy, so you end up in a situation where every instance is aliased to the same place in memory, which gives the *illusion* of a hard distinction between class and instance variables. For example, try this: class Dog: kind = 'canine' # class variable shared by all instances def __init__(self, name): self.name = name # instance variable unique to each instance d = Dog('Fido') e = Dog('Buddy') d.kind # shared by all dogs print(d.kind, e.kind, d.name, e.name) d.kind = 'felis sylvestris' print(d.kind, e.kind, d.name, e.name) The output will be: canine canine Fido Buddy felis sylvestris canine Fido Buddy Which would not be the case if those were truly "class variables" Sean

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python bug
by Levente Asztalos 27 Dec '21

27 Dec '21

So, I've been trying to make a memory game.. kind of.. And I noticed a bug and it was buggy every code where I was using this The bug is, when I Try to print a random generated number with IDLE, nothing wrong but when I open it as a regular app, it do not working, sending pictures screen1 is the code screen2 is the code running in IDLE perfectly screen3 is the buggy stuff

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epub version - performance problems
by Mirek Kaim 20 Dec '21

20 Dec '21

Epub version of the docs absolutely chokes PocketBook Touch Lux 5. Not sure if splitting it up into separate parts like it was done with pdf files would help, or if it’s something else, but it seems like a step in the right direction. Ebook readers usually have limited specs - PocketBook runs some custom Linux distro, so despite dual core cpu and 512MB of ram it works nicely overall. Some readers with similar specs are running android, and that ends up being way slower. Throw an ebook with thousands of unoptimized pages on such thing and it’ll just hang. Best regards, Mirek

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Basic But Very Major Bug
by Yatharth Saini 9A 18 Dec '21

18 Dec '21

hi, I am a beginner, but still you must see this prob. See this code: If i will Put the value of X = 1, it will show Not Valid! , At this moment python should show an error that , how can be the variable X , be int and float at the same time , But still it shows Not Valid! I think it needs to be fixed to make python more intelligent language. if isinstance(x, int) and isinstance(x, float) and x=='1': print("Valid type!") else: print("Not valid!")

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Bug in https://docs.python.org/3.10/library/string.html
by Richard Hyde 15 Dec '21

15 Dec '21

One of the examples of string formatting doesn't work. This applies to prior versions of Python as well. The last set of the examples headed: 'Nesting arguments and more complex examples:' starts with the following code: >>> for align, text in zip('<^>', ['left', 'center', 'right']):... '{0:{fill}{align}16}'.format(text, fill=align, align=align)... This omits print()The correct code would be: >>> for align, text in zip('<^>', ['left', 'center', 'right']):... print('{0:{fill}{align}16}'.format(text, fill=align, align=align))... Best wishes Richard Hyde

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[bug report] cmath.phase(x)
by YJ Lee 15 Dec '21

15 Dec '21

To whom it may concern https://docs.python.org/3/library/cmath.html#module-cmath Page says this means that the sign of the result is the same as the sign of x.imag, even when x.imag is zero. But I think *'x.real' *is right. Sincerely, !~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~* Name : YoungJun Lee Cell Phone : +82-10-6657-3411 Blog: https://hackedbypsychedelphia.blogspot.com/ !~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*!~*

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error in documentation for struct
by Neal Crook 13 Dec '21

13 Dec '21

Thanks for being a volunteer and helping to make Python more perfect. In the documentation for struct.unpack_from I think there is an error: the "/" should not be present? https://docs.python.org/3/library/struct.html struct.unpack_from(format, /, buffer, offset=0) [cid:image003.jpg@01D7ED1A.8570BE10] regards, Neal.

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