How can you easily select between PyQt or PySide at runtime?

Question

I would like to do something like this in one source file, QT.py:

import sys
import PyQt4

sys.modules[\"Qt\"] = PyQt4

Then import this fil

Answer 1

Use an import hook:

def set_qt_bindings(package):
    if package not in ('PyQt4', 'PySide'):
        raise ValueError('Unknown Qt Bindings: %s' % package)
    import __builtin__
    __import__ = __builtin__.__import__
    def hook(name, globals=None, locals=None, fromlist=None, level=-1):
        root, sep, other = name.partition('.')
        if root == 'Qt':
            name = package + sep + other
        return __import__(name, globals, locals, fromlist, level)
    __builtin__.__import__ = hook

if __name__ == '__main__':

    import sys

    if len(sys.argv) > 1:

        set_qt_bindings(sys.argv[-1])

        import Qt
        print Qt

        from Qt import QtCore
        print QtCore

        from Qt.QtGui import QWidget
        print QWidget

Output:

$ python2 test.py PySide



$ python2 test.py PyQt4