Address flake8 requirement

Author: smartlixx

examples/shapes_and_collections/arrow_guide.py

@@ -9,9 +9,9 @@
 that behave differently when the data limits on a plot are changed. In general,
 points on a plot can either be fixed in "data space" or "display space".
 Something plotted in data space moves when the data limits are altered - an
-example would be the points in a scatter plot. Something plotted in display space
-stays static when data limits are altered - an example would be a figure title
-or the axis labels.
+example would be the points in a scatter plot. Something plotted in display
+space stays static when data limits are altered - an example would be a 
+figure title or the axis labels.
 
 Arrows consist of a head (and possibly a tail) and a stem drawn between a
 start point and end point, called 'anchor points' from now on.
@@ -39,9 +39,9 @@
 # -----------------------------------------------------------------------
 #
 # This is useful if you are annotating a plot, and don't want the arrow to
-# to change shape or position if you pan or scale the plot. 
+# to change shape or position if you pan or scale the plot.
 #
-# In this case we use `.patches.FancyArrowPatch`
+# In this case we use `.patches.FancyArrowPatch`.
 #
 # Note that when the axis limits are changed, the arrow shape stays the same,
 # but the anchor points move.
@@ -89,7 +89,7 @@
 # Head shape and anchor points fixed in data space
 # ------------------------------------------------
 #
-# In this case we use `.patches.Arrow`
+# In this case we use `.patches.Arrow`.
 #
 # Note that when the axis limits are changed, the arrow shape and location
 # change.