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Backport PR #23232 on branch v3.5.x (Fix passing stem markerfmt positionally when locs are not given) #23292

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Merged
merged 1 commit into from
Jun 21, 2022
Merged

Backport PR #23232 on branch v3.5.x (Fix passing stem markerfmt positionally when locs are not given) #23292

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6 changes: 6 additions & 0 deletions doc/api/next_api_changes/deprecations/23232-TH.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
Passing *linefmt* positionally is undeprecated
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Positional use of all formatting parameters in `~.Axes.stem` has been
deprecated since Matplotlib 3.5. This deprecation is relaxed so that one can
still pass *linefmt* positionally, i.e. ``stem(x, y, 'r')``.
7 changes: 5 additions & 2 deletions lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2853,12 +2853,15 @@ def stem(self, *args, linefmt=None, markerfmt=None, basefmt=None, bottom=0,
heads, = args
locs = np.arange(len(heads))
args = ()
elif isinstance(args[1], str):
heads, *args = args
locs = np.arange(len(heads))
else:
locs, heads, *args = args
if args:
if len(args) > 1:
_api.warn_deprecated(
"3.5",
message="Passing the linefmt parameter positionally is "
message="Passing the markerfmt parameter positionally is "
"deprecated since Matplotlib %(since)s; the "
"parameter will become keyword-only %(removal)s.")

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20 changes: 14 additions & 6 deletions lib/matplotlib/tests/test_axes.py
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Expand Up @@ -3703,16 +3703,24 @@ def test_stem(use_line_collection):


def test_stem_args():
def _assert_equal(stem_container, expected):
x, y = map(list, stem_container.markerline.get_data())
assert x == expected[0]
assert y == expected[1]

fig, ax = plt.subplots()

x = list(range(10))
y = list(range(10))
x = [1, 3, 5]
y = [9, 8, 7]

# Test the call signatures
ax.stem(y)
ax.stem(x, y)
ax.stem(x, y, linefmt='r--')
ax.stem(x, y, linefmt='r--', basefmt='b--')
_assert_equal(ax.stem(y), expected=([0, 1, 2], y))
_assert_equal(ax.stem(x, y), expected=(x, y))
_assert_equal(ax.stem(x, y, linefmt='r--'), expected=(x, y))
_assert_equal(ax.stem(x, y, 'r--'), expected=(x, y))
_assert_equal(ax.stem(x, y, linefmt='r--', basefmt='b--'), expected=(x, y))
_assert_equal(ax.stem(y, linefmt='r--'), expected=([0, 1, 2], y))
_assert_equal(ax.stem(y, 'r--'), expected=([0, 1, 2], y))


def test_stem_dates():
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