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I am trying to use the "imp" library to export all symbols of PyQt4. Use the built-in "import PyQt4.QtCore" is OK, but the python's code failed. My Test is basing on Mac. On Windows, it seems that if you put one "init.py" (empty file is OK) under the QtCore directory, "import QtCore" will success. But on Mac, for some unknown reason, it failed. In the Cli:

bash-3.2# python
Python 2.7.5 (default, Mar  9 2014, 22:15:05)
[GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.0.68)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import PyQt4.QtCore as f
>>> print f.__file__
/Library/Python/2.7/site-packages/PyQt4/QtCore.so

However, this usage failed.

bash-3.2# cd /Library/Python/2.7/site-packages/PyQt4/
bash-3.2# python
Python 2.7.5 (default, Mar  9 2014, 22:15:05)
[GCC 4.2.1 Compatible Apple LLVM 5.0 (clang-500.0.68)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import QtCore
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
SystemError: dynamic module not initialized properly

Can someone explains it?

python
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1 Answers1

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QtCore cannot be directly imported into python. QtCore exists in the PyQt4 library. To access QtCore class you need do the following :

Python 2.7.8 (default, Jun 30 2014, 16:03:49) [MSC v.1500 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> from PyQt4 import QtCore
>>>

The __init__.py files are required to make Python treat the directories as containing packages; this is done to prevent directories with a common name, such as string, from unintentionally hiding valid modules that occur later on the module search path. In the simplest case, __init__.py can just be an empty file, but it can also execute initialization code for the package or set the __all__ variable, described later.

thecreator232
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  • It seems you run the import on windows, well, on windows, "import QtCore" will fail is there is no "__init__.py" place under the QtCore folder, if you add an empty __init__.py under the folder, "import QtCore" will success. – python Nov 11 '14 at 05:12
  • Yes , that's true . The init.py file indicates that the folder is the root of a library. The __init__.py files are required to make Python treat the directories as containing packages; this is done to prevent directories with a common name, such as string, from unintentionally hiding valid modules that occur later on the module search path. In the simplest case, __init__.py can just be an empty file, but it can also execute initialization code for the package or set the __all__ variable, described later. – thecreator232 Nov 11 '14 at 05:15