wxPython4.1 / windows / python3.7 : strptime / locale issue

wxPython Users
#1

Hi all,

test_strptime.py (1.2 KB)

the attached code runs fine on :

  • various linux, with wxpython 4.0.7 / 4.1.0, and python 3.6 / 3.7 / 3.8
  • windows, with wxpython 4.0.7, and python 3.7

but it failes in that case :

  • windows, with wxpython 4.1.0 and python 3.7
    I get this following error :
---> locale.GetName() = fr_FR
Traceback (most recent call last):
  File "test_strptime.py", line 39, in OnInit
    self.diag = Test()
  File "test_strptime.py", line 32, in __init__
    date_out = date2num(datetime.datetime.strptime(date_in, '%Y%m%d%H%M'))
  File "C:\Users\regis\AppData\Local\Programs\Python\Python37\lib\_strptime.py", line 277, in <module>
    _TimeRE_cache = TimeRE()
  File "C:\Users\regis\AppData\Local\Programs\Python\Python37\lib\_strptime.py", line 191, in __init__
    self.locale_time = LocaleTime()
  File "C:\Users\regis\AppData\Local\Programs\Python\Python37\lib\_strptime.py", line 69, in __init__
    self.lang = _getlang()
  File "C:\Users\regis\AppData\Local\Programs\Python\Python37\lib\_strptime.py", line 28, in _getlang
    return locale.getlocale(locale.LC_TIME)
  File "C:\Users\regis\AppData\Local\Programs\Python\Python37\lib\locale.py", line 587, in getlocale
    return _parse_localename(localename)
  File "C:\Users\regis\AppData\Local\Programs\Python\Python37\lib\locale.py", line 495, in _parse_localename
    raise ValueError('unknown locale: %s' % localename)
ValueError: unknown locale: fr-FR

Can you reproduce this kind of issue too with windows system, wxpython 4.1.0 only, and python3.7 ?
What can be done to fix this ?

Note :
I use virtualenv in case this is relevant

Thank you for your attention

#2

Following…I have the same issue on a wxPython 4.1.0 Python 3.8 program running on Win10. Hope we find a workaround soon. I kind of need strptime to work!

#3

See my reply in this topic: What is wxPython doing to the locale to makes pandas crash?

#4

In the other thread that Robin linked, you’ll see my solution (a bit harsh) and Karsten’s response that makes it a little cleaner and more international friendly. Basically, I hard set the locale to “en_US” right after I instantiated the wx app and all of my strptime functions started working just fine. Karsten’s more elegant approach is to first query the locale then replace the “-” with “_” so that everyone is synchronized. Like this:

import locale
hyphenated_locale = wx.WhateverGivesTheStrangeLocale()
locale.setlocale(locale.LC_ALL, hyphenated_locale.replace('-', '_'))

In our case, maybe the “WhatverGivesTheStrangeLocale” function would be “locale.getlocale(locale.LC_TIME)” based on your error messages above. I can’t test right now, but that should get you in the right direction. I would start by hard setting to “fr_FR” right after you instantiate the GUI to make sure it works, then start figuring out how to do this in a cleaner way.

#5

Thanks a lot Suart for your answer.

I tried your solution inspired by Karsten, but I had and error :

Traceback (most recent call last):
  File "test_strptime.py", line 69, in OnInit
    self.diag = Test()
  File "test_strptime.py", line 22, in __init__
    locale.setlocale(locale.LC_ALL, hyphenated_locale.replace('-', '_'))
AttributeError: 'tuple' object has no attribute 'replace'
OnInit returned false, exiting...

So I changed my mind, and I just tried to put right after the first instantiation of my main class this unique line :

locale.setlocale(locale.LC_ALL, '' )

And all seems working fine in my real software I’m working on.
I just have to check on my others Windows systems in different languages, to check if it still working on them too.

But in the sample I send in my first post, this one line workaround didn’t worked as expected, I had to add a Robin’s tip in my main class :

    def InitLocale(self):
        self.ResetLocale()

I join the complete code fixing my example inserted in my first post.

#!/usr/bin/env python3
# -*- coding: UTF-8 -*-

import wx
import locale

import datetime
from matplotlib.dates import date2num

import locale

class Test (wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, -1,
                          'Test', size=(550, 350))   
        
        date = wx.TextCtrl(self, wx.ID_ANY,"", style=wx.TE_READONLY )

        sizer = wx.BoxSizer(wx.HORIZONTAL)
        sizer.Add(date, 0, wx.ALL, 5)
        self.SetSizer(sizer)
        sizer.Fit(self)
        
        date_in = "202005260800"
        date_out = date2num(datetime.datetime.strptime(date_in, '%Y%m%d%H%M'))

        print ("===> date_out = " + str (date_out) )


class MyApp(wx.App):
    def OnInit(self):
        self.diag = Test()
        locale.setlocale(locale.LC_ALL, '' )
        self.SetTopWindow(self.diag)
        self.diag.Layout()
        self.diag.Show()
        self.diag.CenterOnScreen()
        return True

    def InitLocale(self):
        self.ResetLocale()    
    
if __name__ == "__main__":
    app = MyApp(0)    
    app.MainLoop()

Thank you Stuart, Karsten and Robin, I wish you the best.

Note :
I will post again if I notice any issue on my other language windows systems.

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