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Commit877cfe5

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Deprecation warning for cmap_d.
1 parent4915f44 commit877cfe5

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7 files changed

+90
-33
lines changed

7 files changed

+90
-33
lines changed

‎examples/images_contours_and_fields/demo_bboximage.py‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -38,7 +38,7 @@
3838
a=np.vstack((a,a))
3939

4040
# List of all colormaps; skip reversed colormaps.
41-
maps=sorted(mforminplt.cm.cmap_difnotm.endswith("_r"))
41+
maps=sorted(mforminplt.colormaps()ifnotm.endswith("_r"))
4242

4343
ncol=2
4444
nrow=len(maps)//ncol+1

‎lib/matplotlib/backends/qt_editor/figureoptions.py‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -140,11 +140,11 @@ def prepare_data(d, init):
140140
mappabledict[label]=mappable
141141
mappablelabels=sorted(mappabledict,key=cmp_key)
142142
mappables= []
143-
cmaps= [(cmap,name)forname,cmapinsorted(cm.cmap_d.items())]
143+
cmaps= [(cmap,name)forname,cmapinsorted(cm._cmap_registry.items())]
144144
forlabelinmappablelabels:
145145
mappable=mappabledict[label]
146146
cmap=mappable.get_cmap()
147-
ifcmapnotincm.cmap_d.values():
147+
ifcmapnotincm._cmap_registry.values():
148148
cmaps= [(cmap,cmap.name),*cmaps]
149149
low,high=mappable.get_clim()
150150
mappabledata= [

‎lib/matplotlib/cm.py‎

Lines changed: 64 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -15,6 +15,7 @@
1515
normalization.
1616
"""
1717

18+
fromcollections.abcimportMutableMapping
1819
importfunctools
1920

2021
importnumpyasnp
@@ -49,7 +50,7 @@ def revcmap(data):
4950
LUTSIZE=mpl.rcParams['image.lut']
5051

5152

52-
def_gen_cmap_d():
53+
def_gen_cmap_registry():
5354
"""
5455
Generate a dict mapping standard colormap names to standard colormaps, as
5556
well as the reversed colormaps.
@@ -71,10 +72,48 @@ def _gen_cmap_d():
7172
returncmap_d
7273

7374

74-
_cmap_d=_gen_cmap_d()
75-
locals().update(_cmap_d)
75+
class_DeprecatedCmapDictWrapper(MutableMapping):
76+
"""Dictionary mapping for deprecated _cmap_d access."""
77+
78+
def__init__(self,cmap_registry):
79+
self._cmap_registry=cmap_registry
80+
81+
def__delitem__(self,key):
82+
self._warn_deprecated()
83+
self._cmap_registry.__delitem__(key)
84+
85+
def__getitem__(self,key):
86+
self._warn_deprecated()
87+
returnself._cmap_registry.__getitem__(key)
88+
89+
def__iter__(self):
90+
returnself._cmap_registry.__iter__()
91+
92+
def__len__(self):
93+
returnself._cmap_registry.__len__()
94+
95+
def__setitem__(self,key,val):
96+
self._warn_deprecated()
97+
self._cmap_registry.__setitem__(key,val)
98+
99+
defget(self,key,default=None):
100+
self._warn_deprecated()
101+
returnself._cmap_registry.get(key,default)
102+
103+
def_warn_deprecated(self):
104+
cbook.warn_deprecated(
105+
"3.3",
106+
message="The global colormaps dictionary is no longer "
107+
"considered public API.",
108+
alternative="Please use register_cmap() and get_cmap() to "
109+
"access the contents of the dictionary."
110+
)
111+
112+
113+
_cmap_registry=_gen_cmap_registry()
114+
locals().update(_cmap_registry)
76115
# This is no longer considered public API
77-
cmap_d=_cmap_d
116+
cmap_d=_DeprecatedCmapDictWrapper(_cmap_registry)
78117

79118

80119
# Continue with definitions ...
@@ -99,6 +138,13 @@ def register_cmap(name=None, cmap=None, data=None, lut=None):
99138
and the resulting colormap is registered. Instead of this implicit
100139
colormap creation, create a `.LinearSegmentedColormap` and use the first
101140
case: ``register_cmap(cmap=LinearSegmentedColormap(name, data, lut))``.
141+
142+
Notes
143+
-----
144+
Registering a colormap stores a reference to the colormap object
145+
which can currently be modified and inadvertantly change the global
146+
colormap state. This behavior is deprecated and in Matplotlib 3.5
147+
the registered colormap will be immutable.
102148
"""
103149
cbook._check_isinstance((str,None),name=name)
104150
ifnameisNone:
@@ -109,7 +155,7 @@ def register_cmap(name=None, cmap=None, data=None, lut=None):
109155
"Colormap")fromerr
110156
ifisinstance(cmap,colors.Colormap):
111157
cmap._global=True
112-
_cmap_d[name]=cmap
158+
_cmap_registry[name]=cmap
113159
return
114160
iflutisnotNoneordataisnotNone:
115161
cbook.warn_deprecated(
@@ -123,7 +169,7 @@ def register_cmap(name=None, cmap=None, data=None, lut=None):
123169
lut=mpl.rcParams['image.lut']
124170
cmap=colors.LinearSegmentedColormap(name,data,lut)
125171
cmap._global=True
126-
_cmap_d[name]=cmap
172+
_cmap_registry[name]=cmap
127173

128174

129175
defget_cmap(name=None,lut=None):
@@ -133,15 +179,18 @@ def get_cmap(name=None, lut=None):
133179
Colormaps added with :func:`register_cmap` take precedence over
134180
built-in colormaps.
135181
182+
Notes
183+
-----
184+
Currently, this returns the global colormap object, which is deprecated.
185+
In Matplotlib 3.5, you will no longer be able to modify the global
186+
colormaps in-place.
187+
136188
Parameters
137189
----------
138190
name : `matplotlib.colors.Colormap` or str or None, default: None
139-
If a `.Colormap` instance, it will be returned.
140-
Otherwise, the name of a colormap known to Matplotlib, which will
141-
be resampled by *lut*. Currently, this returns the global colormap
142-
object, which is deprecated. In Matplotlib 3.5, you will no longer be
143-
able to modify the global colormaps in-place.
144-
The default, None, means :rc:`image.cmap`.
191+
If a `.Colormap` instance, it will be returned. Otherwise, the name of
192+
a colormap known to Matplotlib, which will be resampled by *lut*. The
193+
default, None, means :rc:`image.cmap`.
145194
lut : int or None, default: None
146195
If *name* is not already a Colormap instance and *lut* is not None, the
147196
colormap will be resampled to have *lut* entries in the lookup table.
@@ -150,11 +199,11 @@ def get_cmap(name=None, lut=None):
150199
name=mpl.rcParams['image.cmap']
151200
ifisinstance(name,colors.Colormap):
152201
returnname
153-
cbook._check_in_list(sorted(_cmap_d),name=name)
202+
cbook._check_in_list(sorted(_cmap_registry),name=name)
154203
iflutisNone:
155-
return_cmap_d[name]
204+
return_cmap_registry[name]
156205
else:
157-
return_cmap_d[name]._resample(lut)
206+
return_cmap_registry[name]._resample(lut)
158207

159208

160209
classScalarMappable:

‎lib/matplotlib/colors.py‎

Lines changed: 9 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -484,18 +484,15 @@ def makeMappingArray(N, data, gamma=1.0):
484484
return_create_lookup_table(N,data,gamma)
485485

486486

487-
def_deprecate_global_cmap(cmap):
488-
ifhasattr(cmap,'_global')andcmap._global:
487+
def_warn_if_global_cmap_modified(cmap):
488+
ifgetattr(cmap,'_global',False):
489489
cbook.warn_deprecated(
490490
"3.3",
491491
message="You are modifying the state of a globally registered "
492-
"colormap. In future versions, you will not be able "
493-
"to modify a globally registered colormap directly. "
494-
"To eliminate this warning until then, you can make "
495-
"a copy of the requested colormap before modifying it. ",
496-
alternative="To modify a colormap without overwriting the "
497-
"global state, you can make a copy of the colormap "
498-
f"first. cmap = copy.copy(mpl.cm.get_cmap({cmap.name})"
492+
"colormap. In future versions, you will not be able to "
493+
"modify a registered colormap in-place. To remove this "
494+
"warning, you can make a copy of the colormap first. "
495+
f"cmap = mpl.cm.get_cmap({cmap.name}).copy()"
499496
)
500497

501498

@@ -619,28 +616,28 @@ def __copy__(self):
619616

620617
defset_bad(self,color='k',alpha=None):
621618
"""Set the color for masked values."""
619+
_warn_if_global_cmap_modified(self)
622620
self._rgba_bad=to_rgba(color,alpha)
623621
ifself._isinit:
624622
self._set_extremes()
625-
_deprecate_global_cmap(self)
626623

627624
defset_under(self,color='k',alpha=None):
628625
"""
629626
Set the color for low out-of-range values when ``norm.clip = False``.
630627
"""
628+
_warn_if_global_cmap_modified(self)
631629
self._rgba_under=to_rgba(color,alpha)
632630
ifself._isinit:
633631
self._set_extremes()
634-
_deprecate_global_cmap(self)
635632

636633
defset_over(self,color='k',alpha=None):
637634
"""
638635
Set the color for high out-of-range values when ``norm.clip = False``.
639636
"""
637+
_warn_if_global_cmap_modified(self)
640638
self._rgba_over=to_rgba(color,alpha)
641639
ifself._isinit:
642640
self._set_extremes()
643-
_deprecate_global_cmap(self)
644641

645642
def_set_extremes(self):
646643
ifself._rgba_under:

‎lib/matplotlib/pyplot.py‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1948,7 +1948,7 @@ def colormaps():
19481948
<https://www.mathworks.com/matlabcentral/fileexchange/2662-cmrmap-m>`_
19491949
by Carey Rappaport
19501950
"""
1951-
returnsorted(cm.cmap_d)
1951+
returnsorted(cm._cmap_registry)
19521952

19531953

19541954
def_setup_pyplot_info_docstrings():

‎lib/matplotlib/tests/test_colors.py‎

Lines changed: 12 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -126,6 +126,17 @@ def test_colormap_global_set_warn():
126126
plt.register_cmap(cmap=orig_cmap)
127127

128128

129+
deftest_colormap_dict_deprecate():
130+
# Make sure we warn on get and set access into cmap_d
131+
withpytest.warns(cbook.MatplotlibDeprecationWarning,
132+
match="The global colormaps dictionary is no longer"):
133+
cm=plt.cm.cmap_d['viridis']
134+
135+
withpytest.warns(cbook.MatplotlibDeprecationWarning,
136+
match="The global colormaps dictionary is no longer"):
137+
plt.cm.cmap_d['test']=cm
138+
139+
129140
deftest_colormap_copy():
130141
cm=plt.cm.Reds
131142
cm_copy=copy.copy(cm)
@@ -874,7 +885,7 @@ def test_pandas_iterable(pd):
874885
assert_array_equal(cm1.colors,cm2.colors)
875886

876887

877-
@pytest.mark.parametrize('name',sorted(cm.cmap_d))
888+
@pytest.mark.parametrize('name',sorted(plt.colormaps()))
878889
deftest_colormap_reversing(name):
879890
"""
880891
Check the generated _lut data of a colormap and corresponding reversed

‎lib/matplotlib/tests/test_pickle.py‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -190,7 +190,7 @@ def test_shared():
190190
assertfig.axes[1].get_xlim()== (10,20)
191191

192192

193-
@pytest.mark.parametrize("cmap",cm.cmap_d.values())
193+
@pytest.mark.parametrize("cmap",cm._cmap_registry.values())
194194
deftest_cmap(cmap):
195195
pickle.dumps(cmap)
196196

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