Removing matplotlib as a dependency in setup.py.

As a result, most tox environments no longer have it present,
so added a lot of try/except to allow that code to run
smoothly when plotting isn't needed or installed.

docs/make_images.py

@@ -23,14 +23,19 @@
 import fractions
 import os
 
-from matplotlib import patches
-from matplotlib import path as _path_mod
-import matplotlib.pyplot as plt
+try:
+    from matplotlib import patches
+    from matplotlib import path as _path_mod
+    import matplotlib.pyplot as plt
+except ImportError:
+    patches = None
+    _path_mod = None
+    plt = None
 import numpy as np
 try:
     import seaborn
 except ImportError:
-    pass
+    seaborn = None
 
 import bezier
 from bezier import _intersection_helpers

functional_tests/runtime_utils.py

@@ -17,12 +17,15 @@
 import os
 import types
 
-import matplotlib.pyplot as plt
+try:
+    import matplotlib.pyplot as plt
+except ImportError:
+    plt = None
 import numpy as np
 try:
     import seaborn  # pylint: disable=unused-import
 except ImportError:
-    pass
+    seaborn = None
 import six
 
 from bezier import _helpers

functional_tests/test_curve_curve.py

@@ -8,7 +8,10 @@
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 
-import matplotlib.pyplot as plt
+try:
+    import matplotlib.pyplot as plt
+except ImportError:
+    plt = None
 import numpy as np
 import pytest
 import six

functional_tests/test_segment_box.py

@@ -8,7 +8,10 @@
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 
-import matplotlib.pyplot as plt
+try:
+    import matplotlib.pyplot as plt
+except ImportError:
+    plt = None
 import numpy as np
 
 from bezier import _intersection_helpers

functional_tests/test_surface_locate.py

@@ -8,7 +8,10 @@
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 
-import matplotlib.pyplot as plt
+try:
+    import matplotlib.pyplot as plt
+except ImportError:
+    plt = None
 import numpy as np
 
 import bezier

functional_tests/test_surface_surface.py

@@ -10,7 +10,10 @@
 
 import collections
 
-import matplotlib.pyplot as plt
+try:
+    import matplotlib.pyplot as plt
+except ImportError:
+    plt = None
 import numpy as np
 import pytest
 import six

setup.py

@@ -46,7 +46,6 @@
 
 REQUIREMENTS = (
     'enum34',
-    'matplotlib >= 1.5.3',
     'numpy >= 1.11.2',
     'six >= 1.9.0',
 )

tests/conftest.py

@@ -18,13 +18,6 @@
 """
 
 
-# pylint: disable=unused-import
-from matplotlib import patches  # noqa: F401
-from matplotlib import path as _path_mod  # noqa: F401
-import matplotlib.pyplot as plt  # noqa: F401
-# pylint: enable=unused-import
-
-
 def pytest_addoption(parser):
     parser.addoption(
         '--ignore-slow',

tox.ini

@@ -106,6 +106,7 @@ deps =
     docutils
     flake8
     flake8-import-order
+    matplotlib
     mock >= 1.3.0
     numpy
     Pygments