fix flake8 warnings, mirror naming/docstring style of other examples

Vlas Sokolov · Vlas Sokolov · commit c3fa54282c71 · 2020-04-22T16:24:12.000+02:00
diff --git a/examples/mplot3d/errorbar3d.py b/examples/mplot3d/errorbar3d.py
@@ -1,8 +1,11 @@
-'''
-An example of using errorbars in mplot3d
-'''
+"""
+============
+3D errorbars
+============
+
+An example of using errorbars with upper and lower limits in mplot3d.
+"""
 
-from mpl_toolkits.mplot3d import Axes3D
 import matplotlib.pyplot as plt
 import numpy as np
 
diff --git a/lib/mpl_toolkits/mplot3d/axes3d.py b/lib/mpl_toolkits/mplot3d/axes3d.py
@@ -2944,7 +2944,7 @@ def errorbar(self, x, y, z, zerr=None, yerr=None, xerr=None, fmt='',
         everymask[offset::errorevery] = True
 
         def _mask_lists(xs, ys, zs, mask=None):
-            """ Applies a mask to three lists. """
+            """Applies a mask to three lists."""
             xs = [l for l, m in zip(xs, mask) if m]
             ys = [l for l, m in zip(ys, mask) if m]
             zs = [l for l, m in zip(zs, mask) if m]
