Fix Path deepcopy signature

has2k1 · has2k1 · commit 026fe3f030c2 · 2016-08-01T13:34:11.000-05:00
**Problem**

Path.__deepcopy__ does not accept a second(`memo`) parameter,
so the common usage of the `deepcopy` function fails.

**Solution**

Add second parameter.
diff --git a/lib/matplotlib/path.py b/lib/matplotlib/path.py
@@ -297,7 +297,7 @@ def __copy__(self):
 
     copy = __copy__
 
-    def __deepcopy__(self):
+    def __deepcopy__(self, memo=None):
         """
         Returns a deepcopy of the `Path`.  The `Path` will not be
         readonly, even if the source `Path` is.
diff --git a/lib/matplotlib/tests/test_path.py b/lib/matplotlib/tests/test_path.py
@@ -1,5 +1,6 @@
 from __future__ import (absolute_import, division, print_function,
                         unicode_literals)
+import copy
 
 import six
 
@@ -172,6 +173,13 @@ def test_path_to_polygons():
     assert_array_equal(p.to_polygons(closed_only=False), [data])
 
 
+def test_path_deepcopy():
+    # Should not raise any error
+    verts = [[0, 0], [1, 1]]
+    path = Path(verts)
+    copy.deepcopy(path)
+
+
 if __name__ == '__main__':
     import nose
     nose.runmodule(argv=['-s', '--with-doctest'], exit=False)
