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pythonwxpythonwxwidgets

purpose of wx.App when just showing a frame is enough

What is the use of the wx.App class (apart from what the documentation says), when you can just create a frame and .Show(True) it?

When should a wx.App class be used, or why shouldn't you create a frame and just show it?

Solution

  • You have to create a wx.App. If you try to instantiate wxPython classes before creating the app, it will fail:

    >>> import wx
>>> frame = wx.Frame(None)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python26\lib\site-packages\wx-2.8-msw-unicode\wx\_windows.py", line 505, in __init__
    _windows_.Frame_swiginit(self,_windows_.new_Frame(*args, **kwargs))
wx._core.PyNoAppError: The wx.App object must be created first!

    There will always be one, and only one, wx.App. Instantiating it initializes wxPython - creates the window thread, etc.