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ValueError exception added to handle mix of {} and % string in colorbar format #27015

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Merged
rcomer merged 1 commit into from
Oct 8, 2023
Merged

ValueError exception added to handle mix of {} and % string in colorbar format #27015

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2 changes: 1 addition & 1 deletion lib/matplotlib/colorbar.py
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Original file line number Diff line number Diff line change
Expand Up @@ -404,7 +404,7 @@ def __init__(self, ax, mappable=None, *, cmap=None,
try:
self._formatter = ticker.FormatStrFormatter(format)
_ = self._formatter(0)
except TypeError:
except (TypeError, ValueError):
self._formatter = ticker.StrMethodFormatter(format)
else:
self._formatter = format # Assume it is a Formatter or None
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8 changes: 7 additions & 1 deletion lib/matplotlib/tests/test_colorbar.py
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Expand Up @@ -15,7 +15,7 @@
BoundaryNorm, LogNorm, PowerNorm, Normalize, NoNorm
)
from matplotlib.colorbar import Colorbar
from matplotlib.ticker import FixedLocator, LogFormatter
from matplotlib.ticker import FixedLocator, LogFormatter, StrMethodFormatter
from matplotlib.testing.decorators import check_figures_equal


Expand Down Expand Up @@ -1230,3 +1230,9 @@ def test_colorbar_wrong_figure():
fig_tl.colorbar(im)
fig_tl.draw_without_rendering()
fig_cl.draw_without_rendering()


def test_colorbar_format_string_and_old():
plt.imshow([[0, 1]])
cb = plt.colorbar(format="{x}%")
assert isinstance(cb._formatter, StrMethodFormatter)