Make margins error as claimed in doc-string

Author: oscargus

lib/matplotlib/axes/_base.py

@@ -2705,7 +2705,7 @@ def margins(self, *margins, x=None, y=None, tight=True):
         before calling :meth:`margins`.
         """
 
-        if margins and x is not None and y is not None:
+        if margins and (x is not None or y is not None):
             raise TypeError('Cannot pass both positional and keyword '
                             'arguments for x and/or y.')
         elif len(margins) == 1:

lib/matplotlib/tests/test_axes.py

@@ -5734,21 +5734,17 @@ def test_set_margin_updates_limits():
     assert ax.get_xlim() == (1, 2)
 
 
-@pytest.mark.parametrize('err, args, kwargs, match',
-                         ((ValueError, (-1,), {},
-                           'margin must be greater than -0.5'),
-                          (ValueError, (1, -1), {},
-                           'margin must be greater than -0.5'),
-                          (ValueError, tuple(), {'x': -1},
-                           'margin must be greater than -0.5'),
-                          (ValueError, tuple(), {'y': -1},
-                           'margin must be greater than -0.5'),
-                          (TypeError, (1, ), {'x': 1, 'y': 1},
-                           'Cannot pass both positional and keyword '
-                           'arguments for x and/or y.'),
-                          (TypeError, (1, 1, 1), {},
-                           'Must pass a single positional argument for all*'),
-                          ))
+@pytest.mark.parametrize('err, args, kwargs, match', (
+        (ValueError, (-1,), {}, r'margin must be greater than -0\.5'),
+        (ValueError, (1, -1), {}, r'margin must be greater than -0\.5'),
+        (ValueError, tuple(), {'x': -1}, r'margin must be greater than -0\.5'),
+        (ValueError, tuple(), {'y': -1}, r'margin must be greater than -0\.5'),
+        (TypeError, (1, ), {'x': 1, 'y': 1},
+         'Cannot pass both positional and keyword arguments for x and/or y'),
+        (TypeError, (1, ), {'x': 1},
+         'Cannot pass both positional and keyword arguments for x and/or y'),
+        (TypeError, (1, 1, 1), {}, 'Must pass a single positional argument'),
+))
 def test_margins_errors(err, args, kwargs, match):
     with pytest.raises(err, match=match):
         fig = plt.figure()

lib/mpl_toolkits/mplot3d/axes3d.py

@@ -489,7 +489,7 @@ def margins(self, *margins, x=None, y=None, z=None, tight=True):
         applies to 3D Axes, it also takes a *z* argument, and returns
         ``(xmargin, ymargin, zmargin)``.
         """
-        if margins and x is not None and y is not None and z is not None:
+        if margins and (x is not None or y is not None or z is not None):
             raise TypeError('Cannot pass both positional and keyword '
                             'arguments for x, y, and/or z.')
         elif len(margins) == 1:

lib/mpl_toolkits/tests/test_mplot3d.py

@@ -1713,13 +1713,26 @@ def test_margins():
     assert ax.margins() == (0, 0.1, 0)
 
 
-def test_margins_errors():
-    fig = plt.figure()
-    ax = fig.add_subplot(projection='3d')
-    with pytest.raises(TypeError, match="Cannot pass"):
-        ax.margins(0.2, x=0.4, y=0.4, z=0.4)
-    with pytest.raises(TypeError, match="Must pass"):
-        ax.margins(0.2, 0.4)
+@pytest.mark.parametrize('err, args, kwargs, match', (
+        (ValueError, (-1,), {}, r'margin must be greater than -0\.5'),
+        (ValueError, (1, -1, 1), {}, r'margin must be greater than -0\.5'),
+        (ValueError, (1, 1, -1), {}, r'margin must be greater than -0\.5'),
+        (ValueError, tuple(), {'x': -1}, r'margin must be greater than -0\.5'),
+        (ValueError, tuple(), {'y': -1}, r'margin must be greater than -0\.5'),
+        (ValueError, tuple(), {'z': -1}, r'margin must be greater than -0\.5'),
+        (TypeError, (1, ), {'x': 1},
+         'Cannot pass both positional and keyword'),
+        (TypeError, (1, ), {'x': 1, 'y': 1, 'z': 1},
+         'Cannot pass both positional and keyword'),
+        (TypeError, (1, ), {'x': 1, 'y': 1},
+         'Cannot pass both positional and keyword'),
+        (TypeError, (1, 1), {}, 'Must pass a single positional argument for'),
+))
+def test_margins_errors(err, args, kwargs, match):
+    with pytest.raises(err, match=match):
+        fig = plt.figure()
+        ax = fig.add_subplot(projection='3d')
+        ax.margins(*args, **kwargs)
 
 
 @check_figures_equal(extensions=["png"])