🌐 Mailman 3 August 2021 - Python-list - python.org

matplotlib questions
by Steve Aug. 28, 2021

Aug. 28, 2021

I am trying to modify the "Bar Graph Demo" at https://matplotlib.org/stable/gallery/index.html, Lines, bars, and markers but the more I experiment and change the code, the more messed up it becomes. I have the demo code working. This is my second attempt. I guess I accidentally got my first chart working but this second one, not so good. Is there any source to help me understand how the code works and how to change it? Among many others options, how do I change the font size? How are the labels placed on the X-axis and Y-axis?

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Re: on the popularity of loops while and for
by Stestagg Aug. 28, 2021

Aug. 28, 2021

On Sun, 29 Aug 2021 at 00:04, Stefan Ram <ram(a)zedat.fu-berlin.de> wrote: > Stestagg <stestagg(a)gmail.com> writes: > >If you're doing this analysis, I'd be pretty interested in how many of > >those while loops where 'while True:' > > Here, about 40 %. Thanks! That's an interesting stat. I might have to look more into how while loops are actually used in other people's code. > > Below is a new version that is supposed to also count "if True:" > and "if 1:" and also removes a bug with the exception handling > (missing "import sys" and missing "UnicodeDecodeError"). I'm not > experienced in using the AST module, so there might still be bugs > in the program! > > import ast > import pathlib > import sys > rootname=r'''PATH TO SOURCE DIR (WITHOUT A BACKQUOTE AT THE END)''' > rootpath=pathlib.Path(rootname) > rootiterable=rootpath.glob('**/*.py') > WhileCount = 0 > TrueCount = 0 > ForCount = 0 > for filepath in rootiterable: > try: > with filepath.open(encoding="utf-8") as file: > source=file.read() > parse=ast.parse(source, filename=str(file)) > for entry in ast.walk(parse): > if isinstance(entry, ast.While): > WhileCount+=1 > if ( isinstance( entry.test, ast.Constant ) and > hasattr( entry.test, "value") and > ( isinstance( entry.test.value, bool ) > and entry.test.value == True or > isinstance( entry.test.value, int ) > and entry.test.value != 0 )): > TrueCount+=1 > print( f"{ForCount=}, {WhileCount=}, {TrueCount=}" ) > elif isinstance(entry, ast.For): > ForCount+=1 > print( f"{ForCount=}, {WhileCount=}" ) > except ( SyntaxError, UnicodeDecodeError )as inst: > print( f"skipping {filepath}." ) > print( f"{sys.exc_info()[ 0 ] =}" ) > print( f"{type( inst ) =}" ) > print( f"{inst.args =}" ) > print( f"{inst =}\n" ) > print( f"{ForCount=}, {WhileCount=}, {TrueCount=}" ) > > > -- > https://mail.python.org/mailman/listinfo/python-list >

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Re: on the popularity of loops while and for
by Hope Rouselle Aug. 28, 2021

Aug. 28, 2021

ram(a)zedat.fu-berlin.de (Stefan Ram) writes: > Hope Rouselle <hrouselle(a)jevedi.com> writes: >>Have you guys ever measured something like that in a casual or serious > > import ast > import pathlib > rootname=r'''<ABSOLUTE PATH TO A DIRECTORY WITH SOURCE CODE>''' > rootpath=pathlib.Path(rootname) > rootiterable=rootpath.glob('**/*.py') > first = True > WhileCount = 0 > ForCount = 0 > for filepath in rootiterable: > try: > with filepath.open(encoding="utf-8") as file: > source=file.read() > parse=ast.parse(source, filename=str(file)) > for entry in ast.walk(parse): > if isinstance(entry, ast.While): > WhileCount+=1 > print( f"{ForCount=}, {WhileCount=}" ) > elif isinstance(entry, ast.For): > ForCount+=1 > print( f"{ForCount=}, {WhileCount=}" ) > except SyntaxError as inst: > if first: > print( f"{sys.exc_info()[ 0 ] =}" ) > print( f"{type( inst ) =}" ) > print( f"{inst.args =}" ) > print( f"{inst =}" ) > print( f"skipping {filepath}." ) > first=False You are so wonderful! Thanks quite a lot. Here's what I got: ForCount=18703, WhileCount=2505 I have pretty much just the standard libraries and a couple more --- sympy and some xlsxwriter library.

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on the popularity of loops while and for
by Hope Rouselle Aug. 28, 2021

Aug. 28, 2021

I'd like get a statistic of how often each loop is used in practice. I was trying to take a look at the Python's standard libraries --- those included in a standard installation of Python 3.9.6, say --- to see which loops are more often used among while and for loops. Of course, since English use the preposition ``for'' a lot, that makes my life harder. Removing comments is easy, but removing strings is harder. So I don't know yet what I'll do. Have you guys ever measured something like that in a casual or serious way? I'd love to know. Thank you!

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Re: on writing a while loop for rolling two dice
by Hope Rouselle Aug. 28, 2021

Aug. 28, 2021

ram(a)zedat.fu-berlin.de (Stefan Ram) writes: > Hope Rouselle <hrouselle(a)jevedi.com> writes: >>Wait, I'm surprised ``outcome'' is still a valid name at the >>return-statement. Wasn't it defined inside the while? Shouldn't its >>scope be restricted to the while block? I had no idea. I should learn >>some Python. > > In Python, local names can be introduced by an assignment > and have function scope. There is no block scope in Python. > > Below, "name" /is/ a local name already, but is being > used before being assigned to. > > def function(): > if False: > name = 0 > return name > > function() > > # return name > # UnboundLocalError: local variable 'name' referenced before assignment I appreciated the example. I had no idea. (I had looked up the rules and it was pretty simple to understand, but an example is always nice.) Thank you so much.

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Re: on perhaps unloading modules?
by Hope Rouselle Aug. 28, 2021

Aug. 28, 2021

"Peter J. Holzer" <hjp-python(a)hjp.at> writes: > On 2021-08-22 16:28:12 -0300, Hope Rouselle wrote: >> I have a certain distaste for syntax too. For instance, I would much >> rather write and read ``first(ls)'' than ``ls[0]''. > > Would you also prefer `twothousandthreehundredandtwentythird(ls)` over > `ls[2322]`? Omg, I'm afraid you are serious! :-D We could use something like list_get(ls, 2322). Of course that ls[2322] is perfect fine.

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Re: configargparse - reading option from config only
by Loris Bennett Aug. 28, 2021

Aug. 28, 2021

Richard Damon <Richard(a)Damon-Family.org> writes: > On 8/26/21 6:01 AM, Loris Bennett wrote: >> Hi, >> >> When using configargparse, it seems that if a value is to be read from a >> config file, it also has to be defined as a command-line argument in >> order to turn up as an attribute in the parser namespace. >> >> I can sort of see why this is the case, but there are also some options >> I would like to read just from the config file and not have them >> available as command-line options. This would be, say, to prevent the >> number of options on the command-line from becoming bloated by >> little-used settings. >> >> Is there an elegant way to do this? >> >> Cheers, >> >> Loris >> > Look at the read() member function to supply the file name to read. Then > in the config object there will be sections for each section in the > config file. No need for any of these to be 'options' Do you have a link for this? As far as I can see, the config files are given in the following manner: p = configargparse.ArgParser(default_config_files=['/etc/app/conf.d/*.conf', '~/.my_settings']) I can obviously just read the config file with configparser, but the idea of configargparse is that an option can be specified as an option, in a config file, or as an environment variable, As far as I can tell, configargparse only loads entries from the config file into the appropriate namespace if they have also been defined as long options (i.e. with '--'). I was hoping to access *all* the config file entries, regardless of whether they are also options, since the config is obviously being read. Cheers, Loris -- This signature is currently under construction.

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sha3 internal state export & import
by rmlibre＠riseup.net Aug. 27, 2021

Aug. 27, 2021

The hashlib module's SHA3 functions (specifically, sha3_256 & sha3_512) are not able to be pickled as far as I'm able to see. I know that the internal state of a SHA3 object can be easily represented by two unique values, the 1600-bit `S`-state value, and the last, smaller than `r`-rate number of bits (1088 for sha3_256, and 576 for sha3_512) of data which have not yet been incorporated into the `S`-state. Is there a simple way to export these two internal values from a sha3_256 or sha3_512 object, and conversely, a simple way to import these two exported values back into a new object? The goal is to be able to pause a hash object, then to store the state for some later time at which a new object can be created that's functionally equivalent to the first. Is there a simple way to do this? Best, rmlibre

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configargparse - reading option from config only
by Loris Bennett Aug. 27, 2021

Aug. 27, 2021

Hi, When using configargparse, it seems that if a value is to be read from a config file, it also has to be defined as a command-line argument in order to turn up as an attribute in the parser namespace. I can sort of see why this is the case, but there are also some options I would like to read just from the config file and not have them available as command-line options. This would be, say, to prevent the number of options on the command-line from becoming bloated by little-used settings. Is there an elegant way to do this? Cheers, Loris -- This signature is currently under construction.

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Pandas: Multiple CSVs in one Zip file
by Abdur-Rahmaan Janhangeer Aug. 26, 2021

Aug. 26, 2021

Greetings, Cannot read one file in a zip file if the zip file contains multiple files. This example does not work https://www.py4u.net/discuss/203494 as Pandas shows a ValueError: Multiple files found in ZIP file. Only one file per ZIP. If the Zip file has one file, fine else i cannot find a way. Thanks Kind Regards, Abdur-Rahmaan Janhangeer about <https://compileralchemy.github.io/> | blog <https://www.pythonkitchen.com> github <https://github.com/Abdur-RahmaanJ> Mauritius

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