🌐 Mailman 3 October 2018 - Python-list - python.org

Re: ConfigParser: use newline in INI file
by Ned Batchelder March 7, 2019

March 7, 2019

On Saturday, October 1, 2016 at 6:25:16 PM UTC-4, Thorsten Kampe wrote: > * Ben Finney (Sun, 02 Oct 2016 07:12:46 +1100) > > > > Thorsten Kampe <thorsten(a)thorstenkampe.de> writes: > > > > > ConfigParser escapes `\n` in ini values as `\\n`. > > Indenting solves the problem. I'd rather keep it one line per value > but it solves the problem. If you want to have \n mean a newline in your config file, you can do the conversion after you read the value: >>> "a\\nb".decode("string-escape") 'a\nb' --Ned.

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Encounter issues to install Python
by Olivier Oussou Jan. 15, 2019

Jan. 15, 2019

Hi!I downloaded and installed python 3.6.4 (32-bit) on my computer but I have problems and can not access the python interface. I need your technical assistance to solve this matter. Best regard! Olivier OUSSOUMedical entomologist, Benin

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Python Interview Questions
by Krypto Jan. 10, 2019

Jan. 10, 2019

Hi, I have used Python for a couple of projects last year and I found it extremely useful. I could write two middle size projects in 2-3 months (part time). Right now I am a bit rusty and trying to catch up again with Python. I am now appearing for Job Interviews these days and I am wondering if anybody of you appeared for a Python Interview. Can you please share the questions you were asked. That will be great help to me. Thanks,

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How to use multiple instances of the same COM object at the same time
by Jan Dec. 18, 2018

Dec. 18, 2018

Dear Usenet readers, Our company wants to implement about 40 biometric access control devices which have a proprietary DLL with a COM object in it. I've done some research about COM objects and how to use them. Now, I need to connect to every device separately and register for real time events. So, I need about 40 instances of the COM object simultaneously connected and registered to catch all events of all devices. I assumed I needed threading for this, and I have done a simple implementation. All I want to ask is: Does anybody see something that I could have done in a better way? I'm new to COM objects in Python! The program runs fine, it is very basic and I tested it with 3 devices connected at the same time. In production this will be 40! Thanks in advance Jan Source code: # Based on eventappartmentthreading from the win32com demo import sys, os, time import win32com.client import win32api import win32event # sys.coinit_flags not set, so pythoncom initializes apartment-threaded. import pythoncom from threading import Thread threadlist = dict() # this stores the device ids # using the threadid as the key field class ZkEvents: def __init__(self): self.event = win32event.CreateEvent(None, 0, 0, None) thread = win32api.GetCurrentThreadId() print "thread %s " % thread self.dev_id = threadlist[thread] print "Thread Connected For ID %s " % self.dev_id def OnFinger(self): print self.dev_id, print "OnFinger" def OnVerify(self, iUserID=pythoncom.Empty): print self.dev_id, print "OnVerify: %s" % iUserID def OnKeyPress(self, iKey=pythoncom.Empty): print self.dev_id, print "KeyPress: %s" % iKey def WaitWhileProcessingMessages(event, timeout = 60): start = time.clock() while True: # Wake 4 times a second - we can't just specify the # full timeout here, as then it would reset for every # message we process. rc = win32event.MsgWaitForMultipleObjects( (event,), 0, 250, win32event.QS_ALLEVENTS) if rc == win32event.WAIT_OBJECT_0: # event signalled - stop now! return True if (time.clock() - start) > timeout: # Timeout expired. return False # must be a message. pythoncom.PumpWaitingMessages() def TestZkEvents(ip, dev_id): thread = win32api.GetCurrentThreadId() print 'TestZkEvents created ZK object on thread %d'%thread threadlist[thread] = dev_id pythoncom.CoInitialize() zk = win32com.client.DispatchWithEvents("zkemkeeper.ZKEM", ZkEvents) if zk.Connect_Net(ip, 4370): print "Connect %s OK" % ip else: print "Connect %s Failed" % ip try: if zk.RegEvent(1, 65535): # 65535 = register for all events print "RegEvent %s, %s OK" % (ip, dev_id) else: print "RegEvent %s, %s Failed" % (ip, dev_id) except pythoncom.com_error, details: print "Warning - could not open the test HTML file", details # Wait for the event to be signaled while pumping messages. while True: if not WaitWhileProcessingMessages(zk.event): print "No Events From %s During Last Minute" % dev_id zk = None if __name__=='__main__': # this should be a for loop with database fields... t1 = Thread(target=TestZkEvents, args=('192.168.1.211',40)) t1.start() t2 = Thread(target=TestZkEvents, args=('192.168.1.212',45)) t2.start() t3 = Thread(target=TestZkEvents, args=('192.168.1.213',49)) t3.start()

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ipython does not work with latest version of prompt-toolkit
by Cecil Westerhof Dec. 18, 2018

Dec. 18, 2018

When executing: pip3 list --no-cache-dir --outdated I got: prompt-toolkit 1.0.15 2.0.1 wheel PyGObject 3.28.2 3.28.3 sdist youtube-dl 2018.5.30 2018.6.2 wheel So I executed: pip3 install --upgrade prompt-toolkit PyGObject youtube-dl This gave: Successfully installed PyGObject-3.28.3 prompt-toolkit-2.0.1 youtube-dl-2018.6.2 ipython 6.4.0 has requirement prompt-toolkit<2.0.0,>=1.0.15, but you'll have prompt-toolkit 2.0.1 which is incompatible. And when I now execute ipython3, I get: Traceback (most recent call last): File "/usr/local/bin/ipython3", line 7, in <module> from IPython import start_ipython File "/usr/local/lib/python3.5/dist-packages/IPython/__init__.py", line 55, in <module> from .terminal.embed import embed File "/usr/local/lib/python3.5/dist-packages/IPython/terminal/embed.py", line 16, in <module> from IPython.terminal.interactiveshell import TerminalInteractiveShell File "/usr/local/lib/python3.5/dist-packages/IPython/terminal/interactiveshell.py", line 22, in <module> from prompt_toolkit.shortcuts import create_prompt_application, create_eventloop, create_prompt_layout, create_output ImportError: cannot import name 'create_prompt_application' When I now execute: pip3 list --no-cache-dir --outdated I do not get output. So pip3 thinks everything is OK. How do I fix this? Or is the expected that ipython3 will be updated shortly? -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof

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python CAD libraries?
by Jayden Dec. 13, 2018

Dec. 13, 2018

Are there any python CAD libraries that can (1) build simple 3D primitives solids such as spheres, cylinders and so on (2) perform bool operations on 3D solids (3) better if it has some transformations such has scaling, sweeping, and lofting Please recommend some good ones for me? Thanks a lot!!

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py2exe, program has stoped working!?
by skanemupp＠yahoo.se Nov. 22, 2018

Nov. 22, 2018

so i used py2exe and i have the build and the dist-folders. in the distfolder there is a Calculator.exe file. when i run it it just says "Calculator.exe has stopped working" in a popup but the program itself never shows up. wtf!? and when im distributing my program i have to include both catalogues right?

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Python indentation (3 spaces)
by ts9564＠gmail.com Nov. 11, 2018

Nov. 11, 2018

I am new to Python programming but have significant SQL and C experience. My simple question is,"Why not standardize Python indentations to 3 spaces instead of 4 in order to avoid potential programming errors associated with using "TAB" instead of 4 spaces?" Thoughts? Thomas

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@staticmethod or def function()?
by Tobiah Oct. 31, 2018

Oct. 31, 2018

My IDE (pycharm) suggests that I mark my class methods with @staticmethod when they don't use 'self'. Sounds good. I did that then it suggested I had the option to make a regular function instead, at the file level. That's a possibility. I was thinking that I'd leave the method in the class unless it was ever also used by another class. What do you think?

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Re: @staticmethod or def function()?
by Marko Rauhamaa Oct. 31, 2018

Oct. 31, 2018

Peter Otten <__peter__(a)web.de>: > Do not make changes to your code only to apeace a linter. Precisely. Don't let a tool drive a show. > Regarding more the general question, should I use an instance method, > a class method, a static method, or a function? -- that is hard to > answer without an idea what the specific task of the function/method > is, and how strong the link to the class is. I just always use regular instance methods. If I really want to "disappear" self, I'll just take the function out of the class. Marko

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