From f99743c5494692cf14ac7400b4d8fbd8cec8e8f8 Mon Sep 17 00:00:00 2001
From: Matte <mattias.johansson@ivbar.com>
Date: Mon, 24 Sep 2018 14:59:17 +0200
Subject: [PATCH] Replaced noqa-comments by using Axes3D.name instead of '3d'
 for projection parameters.

---
 examples/frontpage/3D.py                     | 5 ++---
 examples/mplot3d/2dcollections3d.py          | 5 ++---
 examples/mplot3d/3d_bars.py                  | 7 +++----
 examples/mplot3d/bars3d.py                   | 5 ++---
 examples/mplot3d/custom_shaded_3d_surface.py | 5 ++---
 examples/mplot3d/hist3d.py                   | 5 ++---
 examples/mplot3d/lines3d.py                  | 5 ++---
 examples/mplot3d/lorenz_attractor.py         | 5 ++---
 examples/mplot3d/mixed_subplots.py           | 5 ++---
 examples/mplot3d/offset.py                   | 5 ++---
 examples/mplot3d/pathpatch3d.py              | 5 ++---
 examples/mplot3d/polys3d.py                  | 5 ++---
 examples/mplot3d/quiver3d.py                 | 5 ++---
 examples/mplot3d/scatter3d.py                | 5 ++---
 examples/mplot3d/subplot3d.py                | 7 +++----
 examples/mplot3d/surface3d.py                | 5 ++---
 examples/mplot3d/surface3d_2.py              | 5 ++---
 examples/mplot3d/surface3d_3.py              | 5 ++---
 examples/mplot3d/surface3d_radial.py         | 5 ++---
 examples/mplot3d/text3d.py                   | 5 ++---
 examples/mplot3d/tricontour3d.py             | 5 ++---
 examples/mplot3d/tricontourf3d.py            | 5 ++---
 examples/mplot3d/trisurf3d.py                | 5 ++---
 examples/mplot3d/trisurf3d_2.py              | 7 +++----
 examples/mplot3d/voxels.py                   | 5 ++---
 examples/mplot3d/voxels_numpy_logo.py        | 5 ++---
 examples/mplot3d/voxels_rgb.py               | 5 ++---
 examples/mplot3d/voxels_torus.py             | 5 ++---
 examples/mplot3d/wire3d_animation_sgskip.py  | 5 ++---
 examples/pyplots/whats_new_1_subplot3d.py    | 7 +++----
 30 files changed, 64 insertions(+), 94 deletions(-)

diff --git a/examples/frontpage/3D.py b/examples/frontpage/3D.py
index ee93026ed06e..7829e0561912 100644
--- a/examples/frontpage/3D.py
+++ b/examples/frontpage/3D.py
@@ -6,8 +6,7 @@
 This example reproduces the frontpage 3D example.
 
 """
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 from matplotlib import cbook
 from matplotlib import cm
@@ -26,7 +25,7 @@
 region = np.s_[5:50, 5:50]
 x, y, z = x[region], y[region], z[region]
 
-fig, ax = plt.subplots(subplot_kw=dict(projection='3d'))
+fig, ax = plt.subplots(subplot_kw=dict(projection=Axes3D.name))
 
 ls = LightSource(270, 45)
 # To use a custom hillshading mode, override the built-in shading and pass
diff --git a/examples/mplot3d/2dcollections3d.py b/examples/mplot3d/2dcollections3d.py
index 589e1083f7f5..78ef0d003332 100644
--- a/examples/mplot3d/2dcollections3d.py
+++ b/examples/mplot3d/2dcollections3d.py
@@ -7,14 +7,13 @@
 selective axes of a 3D plot.
 """
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import numpy as np
 import matplotlib.pyplot as plt
 
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 
 # Plot a sin curve using the x and y axes.
 x = np.linspace(0, 1, 100)
diff --git a/examples/mplot3d/3d_bars.py b/examples/mplot3d/3d_bars.py
index 483dbcc4fb71..04225f085fa0 100644
--- a/examples/mplot3d/3d_bars.py
+++ b/examples/mplot3d/3d_bars.py
@@ -10,14 +10,13 @@
 
 import numpy as np
 import matplotlib.pyplot as plt
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 
 # setup the figure and axes
 fig = plt.figure(figsize=(8, 3))
-ax1 = fig.add_subplot(121, projection='3d')
-ax2 = fig.add_subplot(122, projection='3d')
+ax1 = fig.add_subplot(121, projection=Axes3D.name)
+ax2 = fig.add_subplot(122, projection=Axes3D.name)
 
 # fake data
 _x = np.arange(4)
diff --git a/examples/mplot3d/bars3d.py b/examples/mplot3d/bars3d.py
index e30175ffac41..d2ff269c840b 100644
--- a/examples/mplot3d/bars3d.py
+++ b/examples/mplot3d/bars3d.py
@@ -7,8 +7,7 @@
 planes y=0, y=1, etc.
 """
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 import numpy as np
@@ -18,7 +17,7 @@
 
 
 fig = plt.figure()
-ax = fig.add_subplot(111, projection='3d')
+ax = fig.add_subplot(111, projection=Axes3D.name)
 
 colors = ['r', 'g', 'b', 'y']
 yticks = [3, 2, 1, 0]
diff --git a/examples/mplot3d/custom_shaded_3d_surface.py b/examples/mplot3d/custom_shaded_3d_surface.py
index 366658856470..4d94dc6e5028 100644
--- a/examples/mplot3d/custom_shaded_3d_surface.py
+++ b/examples/mplot3d/custom_shaded_3d_surface.py
@@ -6,8 +6,7 @@
 Demonstrates using custom hillshading in a 3D surface plot.
 """
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 from matplotlib import cbook
 from matplotlib import cm
@@ -28,7 +27,7 @@
 x, y, z = x[region], y[region], z[region]
 
 # Set up plot
-fig, ax = plt.subplots(subplot_kw=dict(projection='3d'))
+fig, ax = plt.subplots(subplot_kw=dict(projection=Axes3D.name))
 
 ls = LightSource(270, 45)
 # To use a custom hillshading mode, override the built-in shading and pass
diff --git a/examples/mplot3d/hist3d.py b/examples/mplot3d/hist3d.py
index 4cab341a64a2..8201a0265a7e 100644
--- a/examples/mplot3d/hist3d.py
+++ b/examples/mplot3d/hist3d.py
@@ -6,8 +6,7 @@
 Demo of a histogram for 2 dimensional data as a bar graph in 3D.
 """
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 import numpy as np
@@ -17,7 +16,7 @@
 
 
 fig = plt.figure()
-ax = fig.add_subplot(111, projection='3d')
+ax = fig.add_subplot(111, projection=Axes3D.name)
 x, y = np.random.rand(2, 100) * 4
 hist, xedges, yedges = np.histogram2d(x, y, bins=4, range=[[0, 4], [0, 4]])
 
diff --git a/examples/mplot3d/lines3d.py b/examples/mplot3d/lines3d.py
index e0e45b1c051c..b308bfd69f95 100644
--- a/examples/mplot3d/lines3d.py
+++ b/examples/mplot3d/lines3d.py
@@ -6,8 +6,7 @@
 This example demonstrates plotting a parametric curve in 3D.
 '''
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import numpy as np
 import matplotlib.pyplot as plt
@@ -16,7 +15,7 @@
 plt.rcParams['legend.fontsize'] = 10
 
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 
 # Prepare arrays x, y, z
 theta = np.linspace(-4 * np.pi, 4 * np.pi, 100)
diff --git a/examples/mplot3d/lorenz_attractor.py b/examples/mplot3d/lorenz_attractor.py
index 5a1328a769d3..0fc30307ad0e 100644
--- a/examples/mplot3d/lorenz_attractor.py
+++ b/examples/mplot3d/lorenz_attractor.py
@@ -15,8 +15,7 @@
 
 import numpy as np
 import matplotlib.pyplot as plt
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 
 def lorenz(x, y, z, s=10, r=28, b=2.667):
@@ -56,7 +55,7 @@ def lorenz(x, y, z, s=10, r=28, b=2.667):
 
 # Plot
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 
 ax.plot(xs, ys, zs, lw=0.5)
 ax.set_xlabel("X Axis")
diff --git a/examples/mplot3d/mixed_subplots.py b/examples/mplot3d/mixed_subplots.py
index 0a13715aad1b..86b28e1fd846 100644
--- a/examples/mplot3d/mixed_subplots.py
+++ b/examples/mplot3d/mixed_subplots.py
@@ -5,8 +5,7 @@
 
 This example shows a how to plot a 2D and 3D plot on the same figure.
 """
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 import numpy as np
@@ -35,7 +34,7 @@ def f(t):
 ax.set_ylabel('Damped oscillation')
 
 # Second subplot
-ax = fig.add_subplot(2, 1, 2, projection='3d')
+ax = fig.add_subplot(2, 1, 2, projection=Axes3D.name)
 
 X = np.arange(-5, 5, 0.25)
 Y = np.arange(-5, 5, 0.25)
diff --git a/examples/mplot3d/offset.py b/examples/mplot3d/offset.py
index 04c56ed2066e..5f3f156c7896 100644
--- a/examples/mplot3d/offset.py
+++ b/examples/mplot3d/offset.py
@@ -13,15 +13,14 @@
 automatically trigger it.
 '''
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 import numpy as np
 
 
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 
 X, Y = np.mgrid[0:6*np.pi:0.25, 0:4*np.pi:0.25]
 Z = np.sqrt(np.abs(np.cos(X) + np.cos(Y)))
diff --git a/examples/mplot3d/pathpatch3d.py b/examples/mplot3d/pathpatch3d.py
index 5976adf728a5..2b0137261317 100644
--- a/examples/mplot3d/pathpatch3d.py
+++ b/examples/mplot3d/pathpatch3d.py
@@ -11,8 +11,7 @@
 from matplotlib.patches import Circle, PathPatch
 from matplotlib.text import TextPath
 from matplotlib.transforms import Affine2D
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 import mpl_toolkits.mplot3d.art3d as art3d
 
 
@@ -43,7 +42,7 @@ def text3d(ax, xyz, s, zdir="z", size=None, angle=0, usetex=False, **kwargs):
 
 
 fig = plt.figure()
-ax = fig.add_subplot(111, projection='3d')
+ax = fig.add_subplot(111, projection=Axes3D.name)
 
 # Draw a circle on the x=0 'wall'
 p = Circle((5, 5), 3)
diff --git a/examples/mplot3d/polys3d.py b/examples/mplot3d/polys3d.py
index 2f7769bb784c..93c49b839478 100644
--- a/examples/mplot3d/polys3d.py
+++ b/examples/mplot3d/polys3d.py
@@ -8,8 +8,7 @@
 of 'jagged stained glass' effect.
 """
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 from matplotlib.collections import PolyCollection
 import matplotlib.pyplot as plt
@@ -36,7 +35,7 @@ def polygon_under_graph(xlist, ylist):
 
 
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 
 # Make verts a list, verts[i] will be a list of (x,y) pairs defining polygon i
 verts = []
diff --git a/examples/mplot3d/quiver3d.py b/examples/mplot3d/quiver3d.py
index 6921b4a1d26c..9c11e828b698 100644
--- a/examples/mplot3d/quiver3d.py
+++ b/examples/mplot3d/quiver3d.py
@@ -6,14 +6,13 @@
 Demonstrates plotting directional arrows at points on a 3d meshgrid.
 '''
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 import numpy as np
 
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 
 # Make the grid
 x, y, z = np.meshgrid(np.arange(-0.8, 1, 0.2),
diff --git a/examples/mplot3d/scatter3d.py b/examples/mplot3d/scatter3d.py
index d8c6a05606cd..d07c7e058928 100644
--- a/examples/mplot3d/scatter3d.py
+++ b/examples/mplot3d/scatter3d.py
@@ -6,8 +6,7 @@
 Demonstration of a basic scatterplot in 3D.
 '''
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 import numpy as np
@@ -24,7 +23,7 @@ def randrange(n, vmin, vmax):
     return (vmax - vmin)*np.random.rand(n) + vmin
 
 fig = plt.figure()
-ax = fig.add_subplot(111, projection='3d')
+ax = fig.add_subplot(111, projection=Axes3D.name)
 
 n = 100
 
diff --git a/examples/mplot3d/subplot3d.py b/examples/mplot3d/subplot3d.py
index e9c1c3f2d712..806c6aef1ea1 100644
--- a/examples/mplot3d/subplot3d.py
+++ b/examples/mplot3d/subplot3d.py
@@ -11,8 +11,7 @@
 import numpy as np
 
 from mpl_toolkits.mplot3d.axes3d import get_test_data
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 
 # set up a figure twice as wide as it is tall
@@ -22,7 +21,7 @@
 #  First subplot
 #===============
 # set up the axes for the first plot
-ax = fig.add_subplot(1, 2, 1, projection='3d')
+ax = fig.add_subplot(1, 2, 1, projection=Axes3D.name)
 
 # plot a 3D surface like in the example mplot3d/surface3d_demo
 X = np.arange(-5, 5, 0.25)
@@ -39,7 +38,7 @@
 # Second subplot
 #===============
 # set up the axes for the second plot
-ax = fig.add_subplot(1, 2, 2, projection='3d')
+ax = fig.add_subplot(1, 2, 2, projection=Axes3D.name)
 
 # plot a 3D wireframe like in the example mplot3d/wire3d_demo
 X, Y, Z = get_test_data(0.05)
diff --git a/examples/mplot3d/surface3d.py b/examples/mplot3d/surface3d.py
index eac122b6aa13..38e12e1620a8 100644
--- a/examples/mplot3d/surface3d.py
+++ b/examples/mplot3d/surface3d.py
@@ -10,8 +10,7 @@
 z axis tick labels.
 '''
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 from matplotlib import cm
@@ -20,7 +19,7 @@
 
 
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 
 # Make data.
 X = np.arange(-5, 5, 0.25)
diff --git a/examples/mplot3d/surface3d_2.py b/examples/mplot3d/surface3d_2.py
index fe3c2fe476ea..e8156b6301ee 100644
--- a/examples/mplot3d/surface3d_2.py
+++ b/examples/mplot3d/surface3d_2.py
@@ -6,15 +6,14 @@
 Demonstrates a very basic plot of a 3D surface using a solid color.
 '''
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 import numpy as np
 
 
 fig = plt.figure()
-ax = fig.add_subplot(111, projection='3d')
+ax = fig.add_subplot(111, projection=Axes3D.name)
 
 # Make data
 u = np.linspace(0, 2 * np.pi, 100)
diff --git a/examples/mplot3d/surface3d_3.py b/examples/mplot3d/surface3d_3.py
index d75dc6680152..ec639dd7daf8 100644
--- a/examples/mplot3d/surface3d_3.py
+++ b/examples/mplot3d/surface3d_3.py
@@ -6,8 +6,7 @@
 Demonstrates plotting a 3D surface colored in a checkerboard pattern.
 '''
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 from matplotlib.ticker import LinearLocator
@@ -15,7 +14,7 @@
 
 
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 
 # Make data.
 X = np.arange(-5, 5, 0.25)
diff --git a/examples/mplot3d/surface3d_radial.py b/examples/mplot3d/surface3d_radial.py
index 521f6195330d..9043f5048337 100644
--- a/examples/mplot3d/surface3d_radial.py
+++ b/examples/mplot3d/surface3d_radial.py
@@ -10,15 +10,14 @@
 Example contributed by Armin Moser.
 '''
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 import numpy as np
 
 
 fig = plt.figure()
-ax = fig.add_subplot(111, projection='3d')
+ax = fig.add_subplot(111, projection=Axes3D.name)
 
 # Create the mesh in polar coordinates and compute corresponding Z.
 r = np.linspace(0, 1.25, 50)
diff --git a/examples/mplot3d/text3d.py b/examples/mplot3d/text3d.py
index ed4934faf5a1..2b141c72e820 100644
--- a/examples/mplot3d/text3d.py
+++ b/examples/mplot3d/text3d.py
@@ -16,14 +16,13 @@
 
 '''
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 
 
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 
 # Demo 1: zdir
 zdirs = (None, 'x', 'y', 'z', (1, 1, 0), (1, 1, 1))
diff --git a/examples/mplot3d/tricontour3d.py b/examples/mplot3d/tricontour3d.py
index feb187cbaa16..634855ba0409 100644
--- a/examples/mplot3d/tricontour3d.py
+++ b/examples/mplot3d/tricontour3d.py
@@ -9,8 +9,7 @@
 tricontourf3d_demo shows the filled version of this example.
 """
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 import matplotlib.tri as tri
@@ -39,7 +38,7 @@
                 < min_radius)
 
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 ax.tricontour(triang, z, cmap=plt.cm.CMRmap)
 
 # Customize the view angle so it's easier to understand the plot.
diff --git a/examples/mplot3d/tricontourf3d.py b/examples/mplot3d/tricontourf3d.py
index d25b2dbd1ea5..a7a8492d0349 100644
--- a/examples/mplot3d/tricontourf3d.py
+++ b/examples/mplot3d/tricontourf3d.py
@@ -9,8 +9,7 @@
 tricontour3d_demo shows the unfilled version of this example.
 """
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 import matplotlib.tri as tri
@@ -40,7 +39,7 @@
                 < min_radius)
 
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 ax.tricontourf(triang, z, cmap=plt.cm.CMRmap)
 
 # Customize the view angle so it's easier to understand the plot.
diff --git a/examples/mplot3d/trisurf3d.py b/examples/mplot3d/trisurf3d.py
index 070a3154f2cb..4bf56fd930fd 100644
--- a/examples/mplot3d/trisurf3d.py
+++ b/examples/mplot3d/trisurf3d.py
@@ -6,8 +6,7 @@
 Plot a 3D surface with a triangular mesh.
 '''
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 import numpy as np
@@ -30,7 +29,7 @@
 z = np.sin(-x*y)
 
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 
 ax.plot_trisurf(x, y, z, linewidth=0.2, antialiased=True)
 
diff --git a/examples/mplot3d/trisurf3d_2.py b/examples/mplot3d/trisurf3d_2.py
index b948c1b14b5d..33090fb2021d 100644
--- a/examples/mplot3d/trisurf3d_2.py
+++ b/examples/mplot3d/trisurf3d_2.py
@@ -14,8 +14,7 @@
 import matplotlib.pyplot as plt
 import matplotlib.tri as mtri
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 
 fig = plt.figure(figsize=plt.figaspect(0.5))
@@ -41,7 +40,7 @@
 
 # Plot the surface.  The triangles in parameter space determine which x, y, z
 # points are connected by an edge.
-ax = fig.add_subplot(1, 2, 1, projection='3d')
+ax = fig.add_subplot(1, 2, 1, projection=Axes3D.name)
 ax.plot_trisurf(x, y, z, triangles=tri.triangles, cmap=plt.cm.Spectral)
 ax.set_zlim(-1, 1)
 
@@ -75,7 +74,7 @@
 triang.set_mask(mask)
 
 # Plot the surface.
-ax = fig.add_subplot(1, 2, 2, projection='3d')
+ax = fig.add_subplot(1, 2, 2, projection=Axes3D.name)
 ax.plot_trisurf(triang, z, cmap=plt.cm.CMRmap)
 
 
diff --git a/examples/mplot3d/voxels.py b/examples/mplot3d/voxels.py
index 4ba96fff6c65..a1e10d928893 100644
--- a/examples/mplot3d/voxels.py
+++ b/examples/mplot3d/voxels.py
@@ -9,8 +9,7 @@
 import matplotlib.pyplot as plt
 import numpy as np
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 
 # prepare some coordinates
@@ -32,7 +31,7 @@
 
 # and plot everything
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 ax.voxels(voxels, facecolors=colors, edgecolor='k')
 
 plt.show()
diff --git a/examples/mplot3d/voxels_numpy_logo.py b/examples/mplot3d/voxels_numpy_logo.py
index 38b00b49f4de..2a403e076f49 100644
--- a/examples/mplot3d/voxels_numpy_logo.py
+++ b/examples/mplot3d/voxels_numpy_logo.py
@@ -8,8 +8,7 @@
 import matplotlib.pyplot as plt
 import numpy as np
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 
 def explode(data):
@@ -43,7 +42,7 @@ def explode(data):
 z[:, :, 1::2] += 0.95
 
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 ax.voxels(x, y, z, filled_2, facecolors=fcolors_2, edgecolors=ecolors_2)
 
 plt.show()
diff --git a/examples/mplot3d/voxels_rgb.py b/examples/mplot3d/voxels_rgb.py
index 7b012b2a61f8..f7f899ae0e93 100644
--- a/examples/mplot3d/voxels_rgb.py
+++ b/examples/mplot3d/voxels_rgb.py
@@ -9,8 +9,7 @@
 import matplotlib.pyplot as plt
 import numpy as np
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 
 def midpoints(x):
@@ -37,7 +36,7 @@ def midpoints(x):
 
 # and plot everything
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 ax.voxels(r, g, b, sphere,
           facecolors=colors,
           edgecolors=np.clip(2*colors - 0.5, 0, 1),  # brighter
diff --git a/examples/mplot3d/voxels_torus.py b/examples/mplot3d/voxels_torus.py
index 3112f82792da..6483ec146ea4 100644
--- a/examples/mplot3d/voxels_torus.py
+++ b/examples/mplot3d/voxels_torus.py
@@ -10,8 +10,7 @@
 import matplotlib.colors
 import numpy as np
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 
 def midpoints(x):
@@ -40,7 +39,7 @@ def midpoints(x):
 
 # and plot everything
 fig = plt.figure()
-ax = fig.gca(projection='3d')
+ax = fig.gca(projection=Axes3D.name)
 ax.voxels(x, y, z, sphere,
           facecolors=colors,
           edgecolors=np.clip(2*colors - 0.5, 0, 1),  # brighter
diff --git a/examples/mplot3d/wire3d_animation_sgskip.py b/examples/mplot3d/wire3d_animation_sgskip.py
index 4e727817264c..144cb4dffd36 100644
--- a/examples/mplot3d/wire3d_animation_sgskip.py
+++ b/examples/mplot3d/wire3d_animation_sgskip.py
@@ -10,8 +10,7 @@
 """
 
 
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 import matplotlib.pyplot as plt
 import numpy as np
@@ -27,7 +26,7 @@ def generate(X, Y, phi):
 
 
 fig = plt.figure()
-ax = fig.add_subplot(111, projection='3d')
+ax = fig.add_subplot(111, projection=Axes3D.name)
 
 # Make the X, Y meshgrid.
 xs = np.linspace(-1, 1, 50)
diff --git a/examples/pyplots/whats_new_1_subplot3d.py b/examples/pyplots/whats_new_1_subplot3d.py
index 96886b0e1f8c..afaa44632438 100644
--- a/examples/pyplots/whats_new_1_subplot3d.py
+++ b/examples/pyplots/whats_new_1_subplot3d.py
@@ -5,8 +5,7 @@
 
 Create two three-dimensional plots in the same figure.
 """
-# This import registers the 3D projection, but is otherwise unused.
-from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+from mpl_toolkits.mplot3d import Axes3D
 
 from matplotlib import cm
 #from matplotlib.ticker import LinearLocator, FixedLocator, FormatStrFormatter
@@ -15,7 +14,7 @@
 
 fig = plt.figure()
 
-ax = fig.add_subplot(1, 2, 1, projection='3d')
+ax = fig.add_subplot(1, 2, 1, projection=Axes3D.name)
 X = np.arange(-5, 5, 0.25)
 Y = np.arange(-5, 5, 0.25)
 X, Y = np.meshgrid(X, Y)
@@ -31,7 +30,7 @@
 fig.colorbar(surf, shrink=0.5, aspect=5)
 
 from mpl_toolkits.mplot3d.axes3d import get_test_data
-ax = fig.add_subplot(1, 2, 2, projection='3d')
+ax = fig.add_subplot(1, 2, 2, projection=Axes3D.name)
 X, Y, Z = get_test_data(0.05)
 ax.plot_wireframe(X, Y, Z, rstride=10, cstride=10)