8000 Use `repr` in error message Addresses #21959 by jefromyers · Pull Request #24403 · matplotlib/matplotlib · GitHub
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Use repr in error message Addresses #21959 #24403

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Merged
merged 6 commits into from
Nov 10, 2022
Merged

Use repr in error message Addresses #21959 #24403

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ffb91b3
use repr in error message closes #21959
jefromyers Nov 8, 2022
60c3aa9
add test for repr error message
jefromyers Nov 8, 2022
d42182e
fix formatting
jefromyers Nov 8, 2022
81cf684
clean up formatting and naming
jefromyers Nov 8, 2022
2b3aa5e
add `pragma: no cover`
jefromyers Nov 9, 2022
4b1fe89
remove import and function name a bit more explicit
jefromyers Nov 10, 2022
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2 changes: 1 addition & 1 deletion lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4416,7 +4416,7 @@ def invalid_shape_exception(csize, xsize):
# severe failure => one may appreciate a verbose feedback.
raise ValueError(
f"'c' argument must be a color, a sequence of colors, "
f"or a sequence of numbers, not {c}") from err
f"or a sequence of numbers, not {c!r}") from err
else:
if len(colors) not in (0, 1, xsize):
# NB: remember that a single color is also acceptable.
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15 changes: 15 additions & 0 deletions lib/matplotlib/tests/test_axes.py
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Expand Up @@ -8290,3 +8290,18 @@ def test_extent_units():
with pytest.raises(ValueError,
match="set_extent did not consume all of the kwargs"):
im.set_extent([2, 12, date_first, date_last], clip=False)


def test_repr_error_message():

def get_next_color():
return 'blue' # currently unused
import re
msg = re.escape(
"'c' argument must be a color, a sequence of colors"
", or a sequence of numbers, not 'red\\n'"
)
with pytest.raises(ValueError, match=msg):
c = 'red\n'
mpl.axes.Axes._parse_scatter_color_args(
c, None, kwargs={}, xsize=2, get_next_color_func=get_next_color)
0