Don't add QtNetwork to the API exported by qt_compat.

This was unnecessarily added.
Also, is_pyqt5 is no more, so declaring it as global has no effect.

Author: anntzer

lib/matplotlib/backends/qt_compat.py

@@ -77,30 +77,29 @@
 
 
 def _setup_pyqt5plus():
-    global QtCore, QtGui, QtWidgets, QtNetwork, __version__, is_pyqt5, \
-        _isdeleted, _getSaveFileName
+    global QtCore, QtGui, QtWidgets, __version__, _isdeleted, _getSaveFileName
 
     if QT_API == QT_API_PYQT6:
-        from PyQt6 import QtCore, QtGui, QtWidgets, QtNetwork, sip
+        from PyQt6 import QtCore, QtGui, QtWidgets, sip
         __version__ = QtCore.PYQT_VERSION_STR
         QtCore.Signal = QtCore.pyqtSignal
         QtCore.Slot = QtCore.pyqtSlot
         QtCore.Property = QtCore.pyqtProperty
         _isdeleted = sip.isdeleted
     elif QT_API == QT_API_PYSIDE6:
-        from PySide6 import QtCore, QtGui, QtWidgets, QtNetwork, __version__
+        from PySide6 import QtCore, QtGui, QtWidgets, __version__
         import shiboken6
         def _isdeleted(obj): return not shiboken6.isValid(obj)
     elif QT_API == QT_API_PYQT5:
-        from PyQt5 import QtCore, QtGui, QtWidgets, QtNetwork
+        from PyQt5 import QtCore, QtGui, QtWidgets
         import sip
         __version__ = QtCore.PYQT_VERSION_STR
         QtCore.Signal = QtCore.pyqtSignal
         QtCore.Slot = QtCore.pyqtSlot
         QtCore.Property = QtCore.pyqtProperty
         _isdeleted = sip.isdeleted
     elif QT_API == QT_API_PYSIDE2:
-        from PySide2 import QtCore, QtGui, QtWidgets, QtNetwork, __version__
+        from PySide2 import QtCore, QtGui, QtWidgets, __version__
         import shiboken2
         def _isdeleted(obj):
             return not shiboken2.isValid(obj)