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Add warning when subplot kwargs are ignored #19436

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Add warning when subplot kwargs are ignored #19436

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4 changes: 4 additions & 0 deletions lib/matplotlib/pyplot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1232,6 +1232,10 @@ def subplot(*args, **kwargs):
# If no existing axes match, then create a new one.
if ax is None:
ax = fig.add_subplot(*args, **kwargs)
elif kwargs:
_api.warn_external(f"An Axes with subplot spec {args} already exists. "
"The existing Axes will be returned, with all "
"keyword arguments ignored.")

bbox = ax.bbox
axes_to_delete = []
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8 changes: 8 additions & 0 deletions lib/matplotlib/tests/test_pyplot.py
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Expand Up @@ -153,3 +153,11 @@ def test_nested_ion_ioff():
with plt.ioff():
plt.ion()
assert not mpl.is_interactive()


def test_subplot_warning():
ax1 = plt.subplot(2, 1, 1)
with pytest.warns(UserWarning, match='An Axes with subplot spec '
r'\(2, 1, 1\) already exists'):
ax2 = plt.subplot(2, 1, 1, polar=True)
assert ax1 is ax2