BackendPySide using multiprocessing + added to setup.py

BackendPySide is now implemented using the same approach as for PyQt4 and PyQt5. The calls in setup.py have been updated to include the 3 Qt interfaces: setupext.BackendQt5(), setupext.BackendQt4(), setupext.BackendPySide(),
matplotlib · tacaswell · Jun 27, 2014 · May 18, 2014 · May 19, 2014 · May 20, 2014
commit 170028248b97c0ca8599826feb7fa7cd87765ea4
diff --git a/setup.py b/setup.py
@@ -90,8 +90,9 @@
    # being the most preferred.  The first one that looks like it will
    # work will be selected as the default backend.
    setupext.BackendMacOSX(),
-    setupext.BackendQt4(),
    setupext.BackendQt5(),
+    setupext.BackendQt4(),
+    setupext.BackendPySide(),
    setupext.BackendGtk3Agg(),
    setupext.BackendGtk3Cairo(),
    setupext.BackendGtkAgg(),

diff --git a/setupext.py b/setupext.py
@@ -1903,13 +1903,15 @@ def backend_qt4_internal_check(self):
        from PyQt4 import QtCore
    except ImportError:
        raise CheckFailed("PyQt4 not found")
+
    try:
        qt_version = QtCore.QT_VERSION
        pyqt_version_str = QtCore.QT_VERSION_STR
    except AttributeError:
        raise CheckFailed('PyQt4 not correctly imported')
-
-    return ("Qt: %s, PyQt: %s" % (self.convert_qt_version(qt_version), pyqt_version_str))
+    else:
+        BackendAgg.force = True
+        return ("Qt: %s, PyQt: %s" % (self.convert_qt_version(qt_version), pyqt_version_str))


 class BackendQt4(BackendQtBase):
@@ -1925,13 +1927,15 @@ def backend_qt5_internal_check(self):
        from PyQt5 import QtCore
    except ImportError:
        raise CheckFailed("PyQt5 not found")
+
    try:
        qt_version = QtCore.QT_VERSION
        pyqt_version_str = QtCore.QT_VERSION_STR
    except AttributeError:
        raise CheckFailed('PyQt5 not correctly imported')
-
-    return ("Qt: %s, PyQt: %s" % (self.convert_qt_version(qt_version), pyqt_version_str))
+    else:
+        BackendAgg.force = True
+        return ("Qt: %s, PyQt: %s" % (self.convert_qt_version(qt_version), pyqt_version_str))


 class BackendQt5(BackendQtBase):
@@ -1942,20 +1946,25 @@ def __init__(self, *args, **kwargs):
        self.callback = backend_qt5_internal_check


-class BackendPySide(OptionalBackendPackage):
+def backend_pyside_internal_check(self):
+    try:
+        from PySide import __version__
+        from PySide import QtCore
+    except ImportError:
+        raise CheckFailed("PySide not found")
+    else:
+        BackendAgg.force = True
+        return ("Qt: %s, PySide: %s" %
+                (QtCore.__version__, __version__))
+
+
+class BackendPySide(BackendQtBase):
    name = "pyside"

-    def check_requirements(self):
-        try:
-            from PySide import __version__
-            from PySide import QtCore
-        except ImportError:
-            raise CheckFailed("PySide not found")
-        else:
-            BackendAgg.force = True
+    def __init__(self, *args, **kwargs):
+        BackendQtBase.__init__(self, *args, **kwargs)
+        self.callback = backend_pyside_internal_check

-            return ("Qt: %s, PySide: %s" %
-                    (QtCore.__version__, __version__))


 class BackendCairo(OptionalBackendPackage):