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Remove the deprecated Qt4 backend.
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‎doc/api/backend_qt_api.rst‎

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@@ -6,16 +6,6 @@ to building the docs.
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.. redirect-from:: /api/backend_qt5agg_api
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.. redirect-from:: /api/backend_qt5cairo_api
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:mod:`matplotlib.backends.backend_qt4agg`
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=========================================
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.. module:: matplotlib.backends.backend_qt4agg
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:mod:`matplotlib.backends.backend_qt4cairo`
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===========================================
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.. module:: matplotlib.backends.backend_qt4cairo
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:mod:`matplotlib.backends.backend_qt5agg`
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=========================================
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‎doc/api/next_api_changes/removals/19894-ES.rst‎

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Qt4-based backends
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~~~~~~~~~~~~~~~~~~
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The qt4agg and qt4cairo backends have been removed. Qt4 has reached its
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end-of-life in 2015 and there are no releases of either PyQt4 or PySide for
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recent versions of Python. Please use one of the Qt5 or Qt6 backends.

‎doc/api/prev_api_changes/api_changes_3.3.0/deprecations.rst‎

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Qt modifier keys
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~~~~~~~~~~~~~~~~
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The ``MODIFIER_KEYS``, ``SUPER``, ``ALT``, ``CTRL``, and ``SHIFT``
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global variables of the :mod:`matplotlib.backends.backend_qt4agg`,
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:mod:`matplotlib.backends.backend_qt4cairo`,
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global variables of the ``matplotlib.backends.backend_qt4agg``,
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``matplotlib.backends.backend_qt4cairo``,
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:mod:`matplotlib.backends.backend_qt5agg` and
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:mod:`matplotlib.backends.backend_qt5cairo` modules are deprecated.
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‎doc/devel/dependencies.rst‎

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@@ -40,7 +40,6 @@ Matplotlib figures can be rendered to various user interfaces. See
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and the capabilities they provide.
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* Tk_ (>= 8.3, != 8.6.0 or 8.6.1) [#]_: for the Tk-based backends.
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* PyQt4_ (>= 4.6) or PySide_ (>= 1.0.3) [#]_: for the Qt4-based backends.
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* PyQt5_ or PySide2_: for the Qt5-based backends.
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* PyGObject_: for the GTK3-based backends [#]_.
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* wxPython_ (>= 4) [#]_: for the wx-based backends.
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* Tornado_: for the WebAgg backend.
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.. _Tk: https://docs.python.org/3/library/tk.html
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.. _PyQt4: https://pypi.org/project/PyQt4
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.. _PySide: https://pypi.org/project/PySide
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.. _PyQt5: https://pypi.org/project/PyQt5
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.. _PySide2: https://pypi.org/project/PySide2
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.. _PyGObject: https://pygobject.readthedocs.io/en/latest/

‎examples/user_interfaces/embedding_in_qt_sgskip.py‎

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import numpy as np
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from matplotlib.backends.qt_compat import QtCore, QtWidgets
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if QtCore.qVersion() >= "5.":
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from matplotlib.backends.backend_qt5agg import (
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FigureCanvas, NavigationToolbar2QT as NavigationToolbar)
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else:
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from matplotlib.backends.backend_qt4agg import (
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FigureCanvas, NavigationToolbar2QT as NavigationToolbar)
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from matplotlib.backends.backend_qt5agg import (
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FigureCanvas, NavigationToolbar2QT as NavigationToolbar)
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from matplotlib.figure import Figure
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‎lib/matplotlib/__init__.py‎

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- interactive backends:
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GTK3Agg, GTK3Cairo, MacOSX, nbAgg,
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Qt4Agg, Qt4Cairo, Qt5Agg, Qt5Cairo,
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Qt5Agg, Qt5Cairo,
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TkAgg, TkCairo, WebAgg, WX, WXAgg, WXCairo
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- non-interactive backends:

‎lib/matplotlib/backend_bases.py‎

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if current_framework is None:
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raise # No, something else went wrong, likely with the install...
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backend_mapping = {'qt5': 'qt5agg',
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'qt4': 'qt4agg',
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'gtk3': 'gtk3agg',
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'wx': 'wxagg',
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'tk': 'tkagg',
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A high-level figure instance.
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"""
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# Set to one of {"qt5", "qt4", "gtk3", "wx", "tk", "macosx"} if an
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# Set to one of {"qt5", "gtk3", "wx", "tk", "macosx"} if an
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# interactive framework is required, or None otherwise.
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required_interactive_framework = None
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# don't break on our side.
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return
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rif = getattr(cls, "required_interactive_framework", None)
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backend2gui_rif = {"qt5": "qt", "qt4": "qt", "gtk3": "gtk3",
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backend2gui_rif = {"qt5": "qt", "gtk3": "gtk3",
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"wx": "wx", "macosx": "osx"}.get(rif)
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if backend2gui_rif:
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if _is_non_interactive_terminal_ipython(ip):

‎lib/matplotlib/backends/backend_qt4.py‎

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‎lib/matplotlib/backends/backend_qt4agg.py‎

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‎lib/matplotlib/backends/backend_qt4cairo.py‎

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