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Commitdd2e6f8

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committed
WARN: fix warning for set_ticklabels
1 parent8c58e42 commitdd2e6f8

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2 files changed

+35
-9
lines changed

2 files changed

+35
-9
lines changed

‎lib/matplotlib/axis.py

Lines changed: 20 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -6,6 +6,7 @@
66
importfunctools
77
importlogging
88
fromnumbersimportReal
9+
importwarnings
910

1011
importnumpyasnp
1112

@@ -1965,7 +1966,10 @@ def set_ticklabels(self, labels, *, minor=False, fontdict=None, **kwargs):
19651966
raiseTypeError(f"{labels:=} must be a sequence")fromNone
19661967
locator= (self.get_minor_locator()ifminor
19671968
elseself.get_major_locator())
1968-
ifisinstance(locator,mticker.FixedLocator):
1969+
ifnotlabels:
1970+
# eg labels=[]:
1971+
formatter=mticker.NullFormatter()
1972+
elifisinstance(locator,mticker.FixedLocator):
19691973
# Passing [] as a list of labels is often used as a way to
19701974
# remove all tick labels, so only error for > 0 labels
19711975
iflen(locator.locs)!=len(labels)andlen(labels)!=0:
@@ -1978,16 +1982,23 @@ def set_ticklabels(self, labels, *, minor=False, fontdict=None, **kwargs):
19781982
func=functools.partial(self._format_with_dict,tickd)
19791983
formatter=mticker.FuncFormatter(func)
19801984
else:
1985+
_api.warn_external(
1986+
"set_ticklabels() should only be used with a fixed number of "
1987+
"ticks, i.e. after set_ticks() or using a FixedLocator.")
19811988
formatter=mticker.FixedFormatter(labels)
19821989

1983-
ifminor:
1984-
self.set_minor_formatter(formatter)
1985-
locs=self.get_minorticklocs()
1986-
ticks=self.get_minor_ticks(len(locs))
1987-
else:
1988-
self.set_major_formatter(formatter)
1989-
locs=self.get_majorticklocs()
1990-
ticks=self.get_major_ticks(len(locs))
1990+
withwarnings.catch_warnings():
1991+
warnings.filterwarnings(
1992+
"ignore",
1993+
message="FixedFormatter should only be used together with FixedLocator")
1994+
ifminor:
1995+
self.set_minor_formatter(formatter)
1996+
locs=self.get_minorticklocs()
1997+
ticks=self.get_minor_ticks(len(locs))
1998+
else:
1999+
self.set_major_formatter(formatter)
2000+
locs=self.get_majorticklocs()
2001+
ticks=self.get_major_ticks(len(locs))
19912002

19922003
ret= []
19932004
iffontdictisnotNone:

‎lib/matplotlib/tests/test_axes.py

Lines changed: 15 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -6063,6 +6063,21 @@ def test_retain_tick_visibility():
60636063
ax.tick_params(axis="y",which="both",length=0)
60646064

60656065

6066+
deftest_warn_too_few_labels():
6067+
# note that the axis is still using an AutoLocator:
6068+
fig,ax=plt.subplots()
6069+
withpytest.warns(
6070+
UserWarning,
6071+
match=r'set_ticklabels\(\) should only be used with a fixed number'):
6072+
ax.set_xticklabels(['0','0.1'])
6073+
# note that the axis is still using a FixedLocator:
6074+
fig,ax=plt.subplots()
6075+
ax.set_xticks([0,0.5,1])
6076+
withpytest.raises(ValueError,
6077+
match='The number of FixedLocator locations'):
6078+
ax.set_xticklabels(['0','0.1'])
6079+
6080+
60666081
deftest_tick_label_update():
60676082
# test issue 9397
60686083

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