🌐 Mailman 3 August 2020 - Python-list - python.org

ABC with abstractmethod: kwargs on Base, explicit names on implementation
by Samuel Marks Aug. 29, 2020

Aug. 29, 2020

After a discussion on #python on Freenode, I'm here. The gist of it is: > Falc - Signature of method 'Pharm.foo()' does not match signature of base method in class 'Base' What's the right way of specialising the children and leaving the Base pretty much empty? Specifically I want: • All implementers to be forced to implement Base's method • Base to be able to do very basic things with kwargs, namely log it (to a file like stdout or a db) • Support for [at least] Python 3.6–3.9 (I don't think `Protocol` has been backported?) • Implementors to have access to the proper name, rather than having to unpack kwargs Should I be using a Base class? - Metaclass? - Something else entirely? - I know giving `b` a default value would resolve the [PyCharm] linter error… but I want it to be a required argument. Full example: from abc import ABC, abstractmethod class Base(ABC): @abstractmethod def foo(self, a, **kwargs): """ :param a: var :type a: ```int``` :param **kwargs: keyword args :type **kwargs: ``dict`` """ print(a) class Pharm(Base): def foo(self, a, b): """ :param a: var :type a: ```int``` :param b: var :type b: ```int``` """ super(Pharm, self).foo(a=a) Thanks, Samuel Marks Charity <https://sydneyscientific.org> | consultancy <https://offscale.io> | open-source <https://github.com/offscale> | LinkedIn <https://linkedin.com/in/samuelmarks>

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Error in lambda function..!
by Shivlal Sharma Aug. 29, 2020

Aug. 29, 2020

from functools import* nums = [1, 2, 3, 4, 5, 6, 7, 8, 9] add = reduce(lambda a : a + 1, nums) print(add) error: - TypeError Traceback (most recent call last) <ipython-input-15-684b5d4fac30> in <module>() 1 from functools import* 2 nums = [1, 2, 3, 4, 5, 6, 7, 8, 9] ----> 3 add = reduce(lambda a : a + 1, nums) 4 print(add) TypeError: <lambda>() takes 1 positional argument but 2 were given

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Didn't understand the output of the following Python 3 code with reduce function?
by Shivlal Sharma Aug. 29, 2020

Aug. 29, 2020

I have seen this code on one of competative programming site but I didn't get it, Why output is 9? from functools import * def ADDS(a,b): return a+1 nums = [1, 2, 3, 4, 5, 6, 7, 8, 9] add = reduce(ADDS, nums) print(add) output: 9

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Fwd: Issue in installing Python (Windows 10)
by Debasis Chatterjee Aug. 29, 2020

Aug. 29, 2020

---------- Forwarded message --------- From: Debasis Chatterjee <debchat1955(a)gmail.com> Date: Fri, Aug 28, 2020 at 3:41 AM Subject: Re: Issue in installing Python (Windows 10) To: Terry Reedy <tjreedy(a)udel.edu> Hi Terry, OK. I think the issue is now solved. I used "pip uninstall" and then "pip install". With that I can run Python programs that use the installed packages. By the way, is there a site where I can login to see such mails and also manage mail notification options? The same as https://python-forum.io/member.php ? Or another one? Thank you Debasis On Wed, Aug 26, 2020 at 5:03 PM Debasis Chatterjee <debchat1955(a)gmail.com> wrote: > Hi Terry, > > I still have the issue. I took help from my company's IT Admin and > deinstalled everything and then made fresh installation. > > Still have issues the packages. > > Such as we need SEGYIO in the program. Program fails to find that. > > When I try to add using "pip" then I get this message. > > C:\Users\debasisc>pip install segyio > Defaulting to user installation because normal site-packages is not > writeable > Requirement already satisfied: segyio in > c:\users\debasisc\appdata\roaming\python\python38\site-packages (1.9.1) > Requirement already satisfied: numpy>=1.10 in > c:\users\debasisc\appdata\roaming\python\python38\site-packages (from > segyio) (1.19.1) > WARNING: You are using pip version 20.1.1; however, version 20.2.2 is > available. > You should consider upgrading via the 'c:\program files > (x86)\python38-32\python.exe -m pip install --upgrade pip' command. > > What do you suggest for troubleshooting? > > Thank you > > Debasis > > On Mon, Aug 24, 2020 at 3:19 PM Terry Reedy <tjreedy(a)udel.edu> wrote: > >> On 8/23/2020 12:39 PM, Debasis Chatterjee wrote: >> >> > I started off by using "python-3.8.5.exe". >> >> 32-bit Windows installer? Windows version might be relevant. >> >> > I use "Run as Administrator" option to click this (provide my >> local-admin >> > username/pwd). >> >> > After this, I see python shell available. But no IDLE. Not sure why? >> >> You mean no IDLE entry on Python 3.8 directory on Start menu? >> >> Installer has a checkbox for tkinter and IDLE. It is on by default for >> a fresh install but I expect it defaults to previous install for >> reinstalls. >> >> On a command line, run 'python -c "import tkinter' to see if you have >> tkinter. 'python -m idlelib' starts IDLE if present. >> >> > From CMD, I can check "pip list". Surprisingly, it shows me packages >> that I >> > installed earlier, before deinstalling and reinstalling. >> >> De-installing does not remove pythonxy directory if you add anything to >> it. >> >> > Something is not right. Hence I am trying to make a fresh restart. >> > >> > One thing odd is that even after removing installed program (Python) >> from >> > control panel, I still find that from "Start". >> >> Have you installed more than one version of Python? Or both 32 and 64 >> bit variation of same Python version? >> >> >> -- >> Terry Jan Reedy >> >> -- >> https://mail.python.org/mailman/listinfo/python-list >> >

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Re: How do I place a preset into the text box?
by Cousin Stanley Aug. 28, 2020

Aug. 28, 2020

Steve wrote: > The following program compiles but does not quite do what I would like it to > do. Line 19 is the preset information but I do not seem to be able to get it > into the form by code. My purpose is to let the user make changes without > having to re-enter the entire code. > .... You might consider moving the entry get() function into the Submit() call back .... def Submit() : label.configure( text = 'The new code is : ' + NewCode.get() ) x = ( NewCode.get() ) print( "\n The new code entered is : " + x ) The following insert function will show the OldCode in the entry box .... OldCode = ( "1234-abcd" ) # .... CodeEntered = ttk.Entry( window , width = 15 , textvariable = NewCode ) CodeEntered.grid( column = 2 , row = 3 , pady = 10 ) CodeEntered.insert( 0 , OldCode ) -- Stanley C. Kitching Human Being Phoenix, Arizona

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How do I place a preset into the text box?
by Steve Aug. 28, 2020

Aug. 28, 2020

The following program compiles but does not quite do what I would like it to do. Line 19 is the preset information but I do not seem to be able to get it into the form by code. My purpose is to let the user make changes without having to re-enter the entire code. Suggestions welcome. Steve #=========================================================== import tkinter as tk from tkinter import ttk import sys window = tk.Tk() window.title("Python Tkinter Text Box") window.minsize(600,400) def Submit(): label.configure(text= 'The new code is: ' + NewCode.get()) def ClickExit(): #This exit closes the program but the form remains and is still active. # I want only to close the form. print("Exiting") sys.exit() OldCode = ("1234-abcd") label = ttk.Label(window, text = "Enter the new code") label.grid(column = 1, row = 1) NewCode = tk.StringVar() CodeEntered = ttk.Entry(window, width = 15, textvariable = NewCode) CodeEntered.grid(column = 2, row = 3) button = ttk.Button(window, text = "Submit", command = Submit) button.grid(column= 2, row = 5) button = ttk.Button(window, text = "Quit", command = ClickExit) button.grid(column= 2, row = 7) window.mainloop() x = (NewCode.get()) print("The new code entered is: " + x) #================================================= Footnote: Mars is the only known planet in our solar system solely inhabited by functioning robots.

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Re: Video file to subtitles file
by Muskan Sanghai Aug. 28, 2020

Aug. 28, 2020

On Friday, August 28, 2020 at 12:27:25 AM UTC+5:30, Barry Scott wrote: > > On 27 Aug 2020, at 18:00, Muskan Sanghai <muskan...(a)gmail.com> wrote: > > > > I would be really thankful if someone can suggest me how can I generate subtitles file (srt format) from a video or audio without using Google cloud and AWS. > What do you know about how subtitles work with video? Do you mean you want to extract the bitmap subtitle data from a MPEG video? > > Barry > > > > > -- > > https://mail.python.org/mailman/listinfo/python-list > > Thank you Barry for your reply, I just know the basics and I want to extract subtitles from a MPEG video and then put the subtitles in that same video. Subtitles can be of any format but it should be convenient for the entire procedure.

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Re: Python 3 how to convert a list of bytes objects to a list of strings?
by Chris Green Aug. 28, 2020

Aug. 28, 2020

Stefan Ram <ram(a)zedat.fu-berlin.de> wrote: > Chris Green <cl(a)isbd.net> writes: > >Therein lies the problem, the incoming byte stream *isn't* ASCII, it's > >an E-Mail message which may, for example, have UTF-8 or other encoded > >characters in it. Hopefully it will have an encoding given in the > >header but that's only if the sender is 'well behaved', one needs to > >be able to handle almost anything and it must be done without 'manual' > >interaction. > > I would make a difference between "scoring" and "transport": > > To transfer a message into an mbox it can be transferred as it is. > Just the bytes from the POP3 server. Let mutt deal with them. > That's what I do at present in Python 2, the problem is that Python 3 complains when I use the standard library to put the message into the mbox. I want to transport the message into my mbox and Python 3 won't do it without knowing how it's encoded whereas Python 2 just stuffed it in there 'as is'. I want Python 3's mailbox class to juyst put what I tell it (even if mis-formatted or mis-encoded) into the mbox. -- Chris Green ·

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Re: Python 3 how to convert a list of bytes objects to a list of strings?
by Chris Green Aug. 28, 2020

Aug. 28, 2020

Cameron Simpson <cs(a)cskk.id.au> wrote: > On 28Aug2020 08:56, Chris Green <cl(a)isbd.net> wrote: > >Stefan Ram <ram(a)zedat.fu-berlin.de> wrote: > >> Chris Angelico <rosuav(a)gmail.com> writes: > >> >But this is a really good job for a list comprehension: > >> >sss = [str(word) for word in bbb] > >> > >> Are you all sure that "str" is really what you all want? > >> > >Not absolutely, you no doubt have been following other threads related > >to this one. :-) > > It is almost certainly not what you want. You want some flavour of > bytes.decode. If the BytesParser doesn't cope, you may need to parse the > headers as some kind of text (eg ISO8859-1) until you find a > content-transfer-encoding header (which still applies only to the body, > not the headers). > > >> |>>> b = b"b" > >> |>>> str( b ) > >> |"b'b'" > >> > >> Maybe try to /decode/ the bytes? > >> > >> |>>> b.decode( "ASCII" ) > >> |'b' > >> > >> > >Therein lies the problem, the incoming byte stream *isn't* ASCII, it's > >an E-Mail message which may, for example, have UTF-8 or other encoded > >characters in it. Hopefully it will have an encoding given in the > >header but that's only if the sender is 'well behaved', one needs to > >be able to handle almost anything and it must be done without 'manual' > >interaction. > > POP3 is presumably handing you bytes containing a message. If the Python > email.BytesParser doesn't handle it, stash the raw bytes _elsewhere_ in > a distinct file in some directory. > > with open('evil_msg_bytes', 'wb') as f: > for bs in bbb: > f.write(bs) > > No interpreation requires, since parsing failed. Then you can start > dealing with these exceptions. _Do not_ write unparsable messages into > an mbox! > Maybe I shouldn't but Python 2 has been managing to do so for several years without any issues. I know I *could* put the exceptions in a bucket somewhere and deal with them separately but I'd really rather not. At prsent (with the Python 2 code still installed) it all 'just works' and the absolute worst corruption I ever see in an E-Mail is things like accented characters missing altogether or £ signs coming out as a funny looking string. Either of these don't really make the message unintelligible. Are we saying that Python 3 really can't be made to handle things 'tolerantly' like Python 2 used to? -- Chris Green ·

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Re: Python 3 how to convert a list of bytes objects to a list of strings?
by Chris Green Aug. 28, 2020

Aug. 28, 2020

Chris Angelico <rosuav(a)gmail.com> wrote: > > Also, if you're parsing an email message, you can and should be doing > so with respect to the encoding(s) stipulated in the headers, after > which you will have valid Unicode text. > But not all E-Mail messages are 'well behaved', the above works fine if the headers specify the correct text encoding but quite often one will get messages with no encoding specified and also one gets messages with the wrong encoding specified. One needs a way to handle these 'rogue' messages such that most of the characters come out right. -- Chris Green ·

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