Static code analysis and corrections

utils/venv/lib/python3.6/site-packages/matplotlib/backends/windowing.py

@@ -0,0 +1,31 @@
+"""
+MS Windows-specific helper for the TkAgg backend.
+
+With rcParams['tk.window_focus'] default of False, it is
+effectively disabled.
+
+It uses a tiny C++ extension module to access MS Win functions.
+
+This module is deprecated and will be removed in version 3.2
+"""
+
+from matplotlib import rcParams, cbook
+
+cbook.warn_deprecated('3.0', obj_type='module', name='backends.windowing')
+
+try:
+    if not rcParams['tk.window_focus']:
+        raise ImportError
+    from matplotlib._windowing import GetForegroundWindow, SetForegroundWindow
+except ImportError:
+    def GetForegroundWindow():
+        return 0
+    def SetForegroundWindow(hwnd):
+        pass
+
+class FocusManager(object):
+    def __init__(self):
+        self._shellWindow = GetForegroundWindow()
+
+    def __del__(self):
+        SetForegroundWindow(self._shellWindow)