Fix examples/ PEP8 errors. Mostly white space.

This fixes a large number of white space errors in the examples/
directory.
When I upgraded Makefile to check the 'make style' on the examples
directory,
the output was hundreds of lines long.   Currently, the output is
managable
and consists solely of "lines too long", as kv lines cannot be split.
This
commit touches an obscene number of files in trivial ways.

examples/3Drendering/main.py

@@ -2,13 +2,13 @@
 3Drendering Example
 =================
 
-This example demonstrates using OpenGL to display rotating monkey head.  This
+This example demonstrates using OpenGL to display rotating monkey head. This
 includes loading a Blender OBJ file, shaders written in OpenGL's Shading
 Language (GLSL), and using scheduled callbacks.
 
 The file monkey.obj is a OBJ file output form the Blender free 3D creation
-software.  The file is text, listing vertices and faces.   It is loaded
-into a scene using objloader.py's ObjFile class.  The file simple.glsl is
+software. The file is text, listing vertices and faces. It is loaded
+into a scene using objloader.py's ObjFile class. The file simple.glsl is
 a simple vertex and fragment shader written in GLSL.
 '''
 

examples/RST_Editor/main.py

@@ -7,6 +7,7 @@
 
 import os
 
+
 class LoadDialog(FloatLayout):
     load = ObjectProperty(None)
     cancel = ObjectProperty(None)
@@ -28,12 +29,14 @@ def dismiss_popup(self):
 
     def show_load(self):
         content = LoadDialog(load=self.load, cancel=self.dismiss_popup)
-        self._popup = Popup(title="Load file", content=content, size_hint=(0.9, 0.9))
+        self._popup = Popup(title="Load file", content=content,
+                            size_hint=(0.9, 0.9))
         self._popup.open()
 
     def show_save(self):
         content = SaveDialog(save=self.save, cancel=self.dismiss_popup)
-        self._popup = Popup(title="Save file", content=content, size_hint=(0.9, 0.9))
+        self._popup = Popup(title="Save file", content=content,
+                            size_hint=(0.9, 0.9))
         self._popup.open()
 
     def load(self, path, filename):
@@ -52,7 +55,6 @@ def save(self, path, filename):
 class Editor(App):
     pass
 
-
 Factory.register('Root', cls=Root)
 Factory.register('LoadDialog', cls=LoadDialog)
 Factory.register('SaveDialog', cls=SaveDialog)

examples/android/compass/main.py

@@ -16,7 +16,6 @@
     ./build.py --package org.test.compass --name compass \
         --private ~/code/kivy/examples/android/compass \
         --window --version 1.0 debug installd
- 
 '''
 
 
@@ -47,7 +46,7 @@ def update_compass(self, *args):
         (x, y, z) = Hardware.magneticFieldSensorReading()
 
         # calculate the angle
-        needle_angle = Vector(x , y).angle((0, 1)) + 90.
+        needle_angle = Vector(x, y).angle((0, 1)) + 90.
 
         # animate the needle
         if self._anim:

examples/android/takepicture/main.py

@@ -35,7 +35,7 @@
 PythonActivity = autoclass('org.renpy.android.PythonActivity')
 MediaStore = autoclass('android.provider.MediaStore')
 Uri = autoclass('android.net.Uri')
-Environment = autoclass('android.os.Environment') 
+Environment = autoclass('android.os.Environment')
 
 
 class Picture(Scatter):
@@ -50,10 +50,10 @@ def build(self):
     def get_filename(self):
         while True:
             self.index += 1
-            fn = Environment.getExternalStorageDirectory().getPath()+'/takepicture{}.jpg'.format(self.index)
+            fn = (Environment.getExternalStorageDirectory().getPath() +
+                  '/takepicture{}.jpg'.format(self.index))
             if not exists(fn):
                 return fn
-
 
     def take_picture(self):
         intent = Intent(MediaStore.ACTION_IMAGE_CAPTURE)
@@ -62,19 +62,18 @@ def take_picture(self):
         self.uri = cast('android.os.Parcelable', self.uri)
         intent.putExtra(MediaStore.EXTRA_OUTPUT, self.uri)
         PythonActivity.mActivity.startActivityForResult(intent, 0x123)
-        
+
     def on_activity_result(self, requestCode, resultCode, intent):
         if requestCode == 0x123:
             Clock.schedule_once(partial(self.add_picture, self.last_fn), 0)
 
     def add_picture(self, fn, *args):
         im = Image.open(fn)
         width, height = im.size
-        im.thumbnail( (width/4,height/4) , Image.ANTIALIAS)
-        im.save(fn,quality=95)
+        im.thumbnail((width / 4, height / 4), Image.ANTIALIAS)
+        im.save(fn, quality=95)
         self.root.add_widget(Picture(source=fn, center=self.root.center))
 
-
     def on_pause(self):
         return True
 

examples/animation/animate.py

@@ -3,7 +3,7 @@
 ================
 
 This example demonstrates creating and applying a multi-part animation to
-a button widget.  You should see a button labelled 'plop' that will move with
+a button widget. You should see a button labelled 'plop' that will move with
 an animation when clicked.
 '''
 

examples/application/app_suite.py

@@ -2,16 +2,16 @@
 Application Suite
 =================
 
-Explore how applications start.   Starts applications one after another, waiting for
-each to be closed first.
+Explore how applications start. Starts applications one after another,
+waiting for each to be closed first.
 '''
 from __future__ import print_function
 import sys
 import re
 from random import choice
 
 import kivy
-kivy.require('1.8.0')  # Minimum API as 1.8 is when kv_directory became part of app.
+kivy.require('1.8.0')  # 1.8 is when kv_directory became part of app.
 from kivy.app import App
 from kivy.uix.button import Button
 from kivy.lang import Builder
@@ -21,6 +21,7 @@
 # starting up the Logger and some other messages.
 print("** In main program, done with imports")
 
+
 class TestBuildApp(App):
     """ Use build() function to return a widget. """
     def build(self):
@@ -31,38 +32,47 @@ def build(self):
         print("** inside build()")
         return Button(text='hello from TestBuildApp')
 
-class TestKVFileApp(App):
-    """ Empty class, but name used to find .kv file.
-    The filename is the lowercase version of the class, i.e.,
-    'testkvfileapp.kv'.  If not found, it strips off the final 'app', i.e.,
-    'testkvfile.kv'.
 
-    If not file is found, and no other method sets the self.root, the program will
-    run with an empty screen. """
+class TestKVFileApp(App):
+    """
+    Empty class, but name used to find .kv file. The filename is the lowercase
+    version of the class, i.e., 'testkvfileapp.kv'. If not found, it strips
+    off the final 'app', i.e., 'testkvfile.kv'. If not file is found, and no
+    other method sets the self.root, the program will run with an empty screen.
+    """
     pass
 
+
 class TestKVDirApp(App):
-    """ Empty class except for setting class variable kv_directory.
+    """
+    Empty class except for setting class variable kv_directory.
     This directory sets the directory in which to search for the .kv file.
     The name of the kv file is still governed by the class name and the .kv
-    file should still have one root widget. """
+    file should still have one root widget.
+    """
     kv_directory = 'app_suite_data'
 
+
 class TestKVStringApp(App):
-    """ Use a build() function and use the kivy.lang.Builder function to parse up a
-        Kivy language string.  """
+    """
+    Use a build() function and use the kivy.lang.Builder function to parse up a
+    Kivy language string.
+    """
     def build(self):
         """   Called by kivy run().  """
         print("** inside build()")
-        widget = Builder.load_string("Button:\n  text: 'hello from TestKVStringApp'")
+        widget = Builder.load_string(
+            "Button:\n  text: 'hello from TestKVStringApp'")
         print("** widget built")
         return widget
 
+
 class TestPrebuiltApp(App):
     """ Use the Builder to create a top level widget at the beginning
     of the Python program, then use a dummy class for that widget.
     This costs a bit more in start-up time. """
-    Builder.load_string("<Prebuilt>\n  Button:\n    text:'hello from TestPrebuiltApp'")
+    kv = "<Prebuilt>\n  Button:\n    text:'hello from TestPrebuiltApp'"
+    Builder.load_string(kv)
     print("** in TestPrebuiltApp, class initialization built <Prebuilt>")
 
     class Prebuilt(FloatLayout):
@@ -81,7 +91,7 @@ def print_class(class_name):
     with open(filename) as f:
         data = f.read()
         regex = "^(class " + class_name + "\\b.*?)^\\S"
-        match = re.search(regex, data, flags=re.MULTILINE|re.DOTALL)
+        match = re.search(regex, data, flags=re.MULTILINE | re.DOTALL)
         if match:
             print(match.group(1))
 

examples/audio/main.py

@@ -2,9 +2,9 @@
 Audio example
 =============
 
-This example plays sounds of different formats.  You should see a grid of
-buttons labelled with filenames.   Clicking on the buttons will play, or
-restart, each sound.   Not all sound formats will play on all platforms.
+This example plays sounds of different formats. You should see a grid of
+buttons labelled with filenames. Clicking on the buttons will play, or
+restart, each sound. Not all sound formats will play on all platforms.
 
 All the sounds are from the http://woolyss.com/chipmusic-samples.php
 "THE FREESOUND PROJECT", Under Creative Commons Sampling Plus 1.0 License.

examples/camera/main.py

@@ -2,8 +2,8 @@
 Camera Example
 ==============
 
-This example demonstrates a simple use of the camera.  It shows a window with
-a buttoned labelled 'play' to turn the camera on and off.  Note that
+This example demonstrates a simple use of the camera. It shows a window with
+a buttoned labelled 'play' to turn the camera on and off. Note that
 not finding a camera, perhaps because gstreamer is not installed, will
 throw an exception during the kv language processing.
 

examples/canvas/bezier.py

@@ -3,9 +3,9 @@
 Bezier Example
 ==============
 
-This example shows a closed Bezier curve computed from a polygon.  You
+This example shows a closed Bezier curve computed from a polygon. You
 should see a purple polygon, a red bezier curve computed from the polygon,
-and two sliders.  You can drag points on the polygon to recompute the curve.
+and two sliders. You can drag points on the polygon to recompute the curve.
 The two sliders control the dash length of the dashed lines making up the two
 shapes.
 
@@ -37,7 +37,7 @@ def __init__(self, points=[], loop=False, *args, **kwargs):
 
             Color(1.0, 0.0, 1.0)
             self.line = Line(
-                    points=self.points+self.points[:2],
+                    points=self.points + self.points[:2],
                     dash_offset=10,
                     dash_length=100)
 
@@ -61,8 +61,9 @@ def _set_line_dash_offset(self, instance, value):
 
     def on_touch_down(self, touch):
         if self.collide_point(touch.pos[0], touch.pos[1]):
-            for i, p in enumerate(list(zip(self.points[::2], self.points[1::2]))):
-                if ( abs(touch.pos[0] - self.pos[0] - p[0]) < self.d and
+            for i, p in enumerate(list(zip(self.points[::2],
+                                           self.points[1::2]))):
+                if (abs(touch.pos[0] - self.pos[0] - p[0]) < self.d and
                     abs(touch.pos[1] - self.pos[1] - p[1]) < self.d):
                     self.current_point = i + 1
                     return True

examples/canvas/canvas_stress.py

@@ -3,8 +3,8 @@
 =============
 
 This example tests the performance of our Graphics engine by drawing large
-numbers of small sqaures.  You should see a black canvas with buttons and a
-label at the bottom.  Pressing the buttons adds small colored squares to the
+numbers of small sqaures. You should see a black canvas with buttons and a
+label at the bottom. Pressing the buttons adds small colored squares to the
 canvas.
 
 '''

examples/canvas/circle.py

@@ -2,10 +2,10 @@
 Circle Example
 ==============
 
-This example exercises circle (ellipse) drawing.  You should see sliders at the
-top of the screen with the Kivy logo below it.  The sliders control the
-angle start and stop and the height and width scales.  There is a button
-to reset the sliders.   The entire example is coded in the
+This example exercises circle (ellipse) drawing. You should see sliders at the
+top of the screen with the Kivy logo below it. The sliders control the
+angle start and stop and the height and width scales. There is a button
+to reset the sliders. The entire example is coded in the
 kv language description.
 '''
 
@@ -60,9 +60,8 @@
         Button:
             text: 'Reset ratios'
             on_press: wm.value = 1; hm.value = 1
-        
+
     FloatLayout:
-        
         canvas:
             Color:
                 rgb: 1, 1, 1
@@ -75,6 +74,7 @@
 
 '''
 
+
 class CircleApp(App):
     def build(self):
         return Builder.load_string(kv)

examples/canvas/fbo_canvas.py

@@ -3,8 +3,8 @@
 ==========
 
 This demonstrates a layout using an FBO (Frame Buffer Off-screen)
-instead of a plain canvas.  You should see a black canvas with a
-button labelled 'FBO' in the bottom left corner.  Clicking it
+instead of a plain canvas. You should see a black canvas with a
+button labelled 'FBO' in the bottom left corner. Clicking it
 animates the button moving right to left.
 '''
 
@@ -34,7 +34,7 @@ def __init__(self, **kwargs):
             self.fbo_rect = Rectangle()
 
         with self.fbo:
-            ClearColor(0,0,0,0)
+            ClearColor(0, 0, 0, 0)
             ClearBuffers()
 
         # wait that all the instructions are in the canvas to set texture
@@ -79,7 +79,7 @@ def build(self):
 
         def anim_btn(*args):
             if b.pos[0] == 0:
-                Animation(x=f.width-b.width).start(b)
+                Animation(x=f.width - b.width).start(b)
             else:
                 Animation(x=0).start(b)
         b.bind(on_press=anim_btn)

examples/canvas/lines.py

@@ -3,11 +3,11 @@
 ============================
 
 This demonstrates the experimental and unfinished SmoothLine feature
-for fast line drawing.  You should see a multi-segment
+for fast line drawing. You should see a multi-segment
 path at the top of the screen, and sliders and buttons along the bottom.
 You can click to add new points to the segment, change the transparency
 and width of the line, or hit 'Animate' to see a set of sine and cosine
-animations.   The Cap and Joint buttons don't work:  SmoothLine has not
+animations. The Cap and Joint buttons don't work: SmoothLine has not
 implemented these features yet.
 '''