old_contents: """
  A wrapper over different Python Qt bindings (e.g., PyQt4_, PyQt5_, PySide_, PySide2_).
  
  Currently only PyQt5_ is implemented.
  
  Example repositories which unify the syntax for PyQt4_, PyQt5_, PySide_ and PySide2_:
  
  * https://github.com/mottosso/Qt.py
  * https://github.com/jupyter/qtconsole/blob/master/qtconsole/qt_loaders.py
  * https://github.com/spyder-ide/qtpy
  * https://github.com/pyQode/pyqode.qt
  * https://github.com/silx-kit/silx/blob/master/silx/gui/qt/_qt.py
  
  .. _PyQt4: http://pyqt.sourceforge.net/Docs/PyQt4/
  .. _PyQt5: http://pyqt.sourceforge.net/Docs/PyQt5/
  .. _PySide: https://wiki.qt.io/PySide
  .. _PySide2: https://wiki.qt.io/PySide2
  """
  from PyQt5 import Qt, QtWidgets, QtCore, QtGui
  
new_contents: """
  A wrapper over different Python Qt bindings (e.g., PyQt4_, PyQt5_, PySide_, PySide2_).
  
  Currently only PyQt5_ is implemented.
  
  Example repositories which unify the syntax for PyQt4_, PyQt5_, PySide_ and PySide2_:
  
  * https://github.com/mottosso/Qt.py
  * https://github.com/jupyter/qtconsole/blob/master/qtconsole/qt_loaders.py
  * https://github.com/spyder-ide/qtpy
  * https://github.com/pyQode/pyqode.qt
  * https://github.com/silx-kit/silx/blob/master/silx/gui/qt/_qt.py
  
  .. _PyQt4: http://pyqt.sourceforge.net/Docs/PyQt4/
  .. _PyQt5: http://pyqt.sourceforge.net/Docs/PyQt5/
  .. _PySide: https://wiki.qt.io/PySide
  .. _PySide2: https://wiki.qt.io/PySide2
  """
  from PyQt5 import Qt, QtWidgets, QtCore, QtGui
  
  __all__ = (
      'Qt',
      'QtGui',
      'QtWidgets',
      'QtCore',
  )
  
subject: add __all__ to _qt.py