Merge pull request #1334 from NelleV/pep8_blocking_input

PEP8 fixes on blocking_input.py

Author: dmcdougall

lib/matplotlib/blocking_input.py

@@ -1,19 +1,24 @@
 """
-This provides several classes used for blocking interaction with figure windows:
+This provides several classes used for blocking interaction with figure
+windows:
 
 :class:`BlockingInput`
-    creates a callable object to retrieve events in a blocking way for interactive sessions
+    creates a callable object to retrieve events in a blocking way for
+    interactive sessions
 
 :class:`BlockingKeyMouseInput`
-    creates a callable object to retrieve key or mouse clicks in a blocking way for interactive sessions.
+    creates a callable object to retrieve key or mouse clicks in a blocking
+    way for interactive sessions.
     Note: Subclass of BlockingInput. Used by waitforbuttonpress
 
 :class:`BlockingMouseInput`
-    creates a callable object to retrieve mouse clicks in a blocking way for interactive sessions.
+    creates a callable object to retrieve mouse clicks in a blocking way for
+    interactive sessions.
     Note: Subclass of BlockingInput.  Used by ginput
 
 :class:`BlockingContourLabeler`
-    creates a callable object to retrieve mouse clicks in a blocking way that will then be used to place labels on a ContourSet
+    creates a callable object to retrieve mouse clicks in a blocking way that
+    will then be used to place labels on a ContourSet
     Note: Subclass of BlockingMouseInput.  Used by clabel
 """
 
@@ -22,14 +27,16 @@
 from matplotlib.cbook import is_sequence_of_strings
 import matplotlib.lines as mlines
 
+
 class BlockingInput(object):
     """
     Class that creates a callable object to retrieve events in a
     blocking way.
     """
     def __init__(self, fig, eventslist=()):
         self.fig = fig
-        assert is_sequence_of_strings(eventslist), "Requires a sequence of event name strings"
+        assert is_sequence_of_strings(
+            eventslist), "Requires a sequence of event name strings"
         self.eventslist = eventslist
 
     def on_event(self, event):
@@ -60,13 +67,13 @@ def cleanup(self):
         for cb in self.callbacks:
             self.fig.canvas.mpl_disconnect(cb)
 
-        self.callbacks=[]
+        self.callbacks = []
 
-    def add_event(self,event):
+    def add_event(self, event):
         """For base class, this just appends an event to events."""
         self.events.append(event)
 
-    def pop_event(self,index=-1):
+    def pop_event(self, index=-1):
         """
         This removes an event from the event list.  Defaults to
         removing last event, but an index can be supplied.  Note that
@@ -76,11 +83,11 @@ def pop_event(self,index=-1):
         """
         self.events.pop(index)
 
-    def pop(self,index=-1):
+    def pop(self, index=-1):
         self.pop_event(index)
-    pop.__doc__=pop_event.__doc__
+    pop.__doc__ = pop_event.__doc__
 
-    def __call__(self, n=1, timeout=30 ):
+    def __call__(self, n=1, timeout=30):
         """
         Blocking call to retrieve n events
         """
@@ -96,18 +103,20 @@ def __call__(self, n=1, timeout=30 ):
 
         # connect the events to the on_event function call
         for n in self.eventslist:
-            self.callbacks.append( self.fig.canvas.mpl_connect(n, self.on_event) )
+            self.callbacks.append(
+                self.fig.canvas.mpl_connect(n, self.on_event))
 
         try:
             # Start event loop
             self.fig.canvas.start_event_loop(timeout=timeout)
-        finally: # Run even on exception like ctrl-c
+        finally:  # Run even on exception like ctrl-c
             # Disconnect the callbacks
             self.cleanup()
 
         # Return the events in this case
         return self.events
 
+
 class BlockingMouseInput(BlockingInput):
     """
     Class that creates a callable object to retrieve mouse clicks in a
@@ -118,25 +127,23 @@ class BlockingMouseInput(BlockingInput):
     enter is like mouse button 2 and all others are like mouse button 1).
     """
 
-    button_add    = 1
-    button_pop    = 3
-    button_stop   = 2
+    button_add = 1
+    button_pop = 3
+    button_stop = 2
 
     def __init__(self, fig, mouse_add=1, mouse_pop=3, mouse_stop=2):
         BlockingInput.__init__(self, fig=fig,
                                eventslist=('button_press_event',
-                                           'key_press_event') )
+                                           'key_press_event'))
         self.button_add = mouse_add
         self.button_pop = mouse_pop
-        self.button_stop= mouse_stop
-
-
+        self.button_stop = mouse_stop
 
     def post_event(self):
         """
         This will be called to process events
         """
-        assert len(self.events)>0, "No events yet"
+        assert len(self.events) > 0, "No events yet"
 
         if self.events[-1].name == 'key_press_event':
             self.key_event()
@@ -171,56 +178,57 @@ def key_event(self):
 
         if key in ['backspace', 'delete']:
             self.mouse_event_pop(event)
-        elif key in ['escape', 'enter']: # on windows XP and wxAgg, the enter key doesn't seem to register
+        elif key in ['escape', 'enter']:
+            # on windows XP and wxAgg, the enter key doesn't seem to register
             self.mouse_event_stop(event)
         else:
             self.mouse_event_add(event)
 
-    def mouse_event_add( self, event ):
+    def mouse_event_add(self, event):
         """
         Will be called for any event involving a button other than
         button 2 or 3.  This will add a click if it is inside axes.
         """
         if event.inaxes:
             self.add_click(event)
-        else: # If not a valid click, remove from event list
-            BlockingInput.pop(self,-1)
+        else:  # If not a valid click, remove from event list
+            BlockingInput.pop(self, -1)
 
-    def mouse_event_stop( self, event ):
+    def mouse_event_stop(self, event):
         """
         Will be called for any event involving button 2.
         Button 2 ends blocking input.
         """
 
         # Remove last event just for cleanliness
-        BlockingInput.pop(self,-1)
+        BlockingInput.pop(self, -1)
 
         # This will exit even if not in infinite mode.  This is
         # consistent with MATLAB and sometimes quite useful, but will
         # require the user to test how many points were actually
         # returned before using data.
         self.fig.canvas.stop_event_loop()
 
-    def mouse_event_pop( self, event ):
+    def mouse_event_pop(self, event):
         """
         Will be called for any event involving button 3.
         Button 3 removes the last click.
         """
         # Remove this last event
-        BlockingInput.pop(self,-1)
+        BlockingInput.pop(self, -1)
 
         # Now remove any existing clicks if possible
-        if len(self.events)>0:
-            self.pop(event,-1)
+        if len(self.events) > 0:
+            self.pop(event, -1)
 
-    def add_click(self,event):
+    def add_click(self, event):
         """
         This add the coordinates of an event to the list of clicks
         """
-        self.clicks.append((event.xdata,event.ydata))
+        self.clicks.append((event.xdata, event.ydata))
 
         verbose.report("input %i: %f,%f" %
-                       (len(self.clicks),event.xdata, event.ydata))
+                       (len(self.clicks), event.xdata, event.ydata))
 
         # If desired plot up click
         if self.show_clicks:
@@ -230,9 +238,7 @@ def add_click(self,event):
             self.marks.append(line)
             self.fig.canvas.draw()
 
-
-
-    def pop_click(self,event,index=-1):
+    def pop_click(self, event, index=-1):
         """
         This removes a click from the list of clicks.  Defaults to
         removing the last click.
@@ -249,17 +255,16 @@ def pop_click(self,event,index=-1):
             # for the keyboard backspace event on windows XP wxAgg.
             # maybe event.inaxes here is a COPY of the actual axes?
 
-
-    def pop(self,event,index=-1):
+    def pop(self, event, index=-1):
         """
         This removes a click and the associated event from the object.
         Defaults to removing the last click, but any index can be
         supplied.
         """
-        self.pop_click(event,index)
-        BlockingInput.pop(self,index)
+        self.pop_click(event, index)
+        BlockingInput.pop(self, index)
 
-    def cleanup(self,event=None):
+    def cleanup(self, event=None):
         # clean the figure
         if self.show_clicks:
 
@@ -278,28 +283,29 @@ def __call__(self, n=1, timeout=30, show_clicks=True):
         clicks.
         """
         self.show_clicks = show_clicks
-        self.clicks      = []
-        self.marks       = []
-        BlockingInput.__call__(self,n=n,timeout=timeout)
+        self.clicks = []
+        self.marks = []
+        BlockingInput.__call__(self, n=n, timeout=timeout)
 
         return self.clicks
 
-class BlockingContourLabeler( BlockingMouseInput ):
+
+class BlockingContourLabeler(BlockingMouseInput):
     """
     Class that creates a callable object that uses mouse clicks or key
     clicks on a figure window to place contour labels.
     """
-    def __init__(self,cs):
+    def __init__(self, cs):
         self.cs = cs
-        BlockingMouseInput.__init__(self, fig=cs.ax.figure )
+        BlockingMouseInput.__init__(self, fig=cs.ax.figure)
 
     def add_click(self, event):
         self.button1(event)
 
     def pop_click(self, event, index=-1):
         self.button3(event)
 
-    def button1(self,event):
+    def button1(self, event):
         """
         This will be called if an event involving a button other than
         2 or 3 occcurs.  This will add a label to a contour.
@@ -311,10 +317,10 @@ def button1(self,event):
                                    inline_spacing=self.inline_spacing,
                                    transform=False)
             self.fig.canvas.draw()
-        else: # Remove event if not valid
+        else:  # Remove event if not valid
             BlockingInput.pop(self)
 
-    def button3(self,event):
+    def button3(self, event):
         """
         This will be called if button 3 is clicked.  This will remove
         a label if not in inline mode.  Unfortunately, if one is doing
@@ -329,26 +335,28 @@ def button3(self,event):
             self.cs.pop_label()
             self.cs.ax.figure.canvas.draw()
 
-    def __call__(self,inline,inline_spacing=5,n=-1,timeout=-1):
-        self.inline=inline
-        self.inline_spacing=inline_spacing
+    def __call__(self, inline, inline_spacing=5, n=-1, timeout=-1):
+        self.inline = inline
+        self.inline_spacing = inline_spacing
 
-        BlockingMouseInput.__call__(self,n=n,timeout=timeout,
+        BlockingMouseInput.__call__(self, n=n, timeout=timeout,
                                     show_clicks=False)
 
+
 class BlockingKeyMouseInput(BlockingInput):
     """
     Class that creates a callable object to retrieve a single mouse or
     keyboard click
     """
     def __init__(self, fig):
-        BlockingInput.__init__(self, fig=fig, eventslist=('button_press_event','key_press_event') )
+        BlockingInput.__init__(self, fig=fig, eventslist=(
+            'button_press_event', 'key_press_event'))
 
     def post_event(self):
         """
         Determines if it is a key event
         """
-        assert len(self.events)>0, "No events yet"
+        assert len(self.events) > 0, "No events yet"
 
         self.keyormouse = self.events[-1].name == 'key_press_event'
 
@@ -358,7 +366,6 @@ def __call__(self, timeout=30):
         Returns True if key click, False if mouse, or None if timeout
         """
         self.keyormouse = None
-        BlockingInput.__call__(self,n=1,timeout=timeout)
+        BlockingInput.__call__(self, n=1, timeout=timeout)
 
         return self.keyormouse
-