Python PyQt5 Learning Note 1

The difference between PYQT4 and PYQT5

The PYQT5 is not a backward compatible with PYQT4; There is several significant changes in PYQT5. However, it is not a very difficult to adjust older code to the new library. The differences is, among others, the following:

PYQT5 is not backwards compatible with PYQT4; This is some important change in PyQt5. However, migrating old code to a new version is not very difficult. The different points are as follows:

• The Python module has been rewritten. Some modules are discarded ( QtScript ), and some of the modules are split into sub-modules ( QtGui , QtWebKit ).
• New modules are introduced, included, QtBluetooth QtPositioning , and Enginio .
• PYQT5 only supports the latest style of signal and slot notation. Calls to SIGNAL () and slot () will not be supported for long periods of time.
• PYQT5 does not support any APIs that are deprecated or canceled in the QT 5.0 release.

Example: Blank window

1 ImportSYS2  fromPyqt5.qtwidgetsImportqapplication, Qwidget3 4 5 if __name__=='__main__':6     7App =qapplication (SYS.ARGV)8 9W =Qwidget ()TenW.resize (250, 150) OneW.move (300, 300) AW.setwindowtitle (' Simple') - w.show () -      theSys.exit (App.exec_ ())

Results:

Python PyQt5 Learning Note 1