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Commit4776e50

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improve legend docstring
1 parent2132073 commit4776e50

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5 files changed

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-22
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5 files changed

+97
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lines changed

‎lib/matplotlib/axes/_axes.py‎

Lines changed: 57 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -283,38 +283,83 @@ def legend(self, *args, **kwargs):
283283
"""
284284
Places a legend on the axes.
285285
286-
To make a legend for lines which already exist on the axes
287-
(via plot for instance), simply call this function with an iterable
288-
of strings, one for each legend item. For example::
286+
Call signatures::
289287
290-
ax.plot([1, 2, 3])
291-
ax.legend(['A simple line'])
288+
legend()
289+
legend(labels)
290+
legend(handles, labels)
291+
292+
The call signatures correspond to three different ways how to use
293+
this method.
292294
293-
However, in order to keep the "label" and the legend element
294-
instance together, it is preferable to specify the label either at
295-
artist creation, or by calling the
296-
:meth:`~matplotlib.artist.Artist.set_label` method on the artist::
295+
**1. Automatic detection of elements to be shown in the legend**
296+
297+
The elements to be added to the legend are automatically determined,
298+
when you do not pass in any extra arguments.
299+
300+
In this case, the labels are taken from the artist. You can specify
301+
them either at artist creation or by calling the
302+
:meth:`~.Artist.set_label` method on the artist::
297303
298304
line, = ax.plot([1, 2, 3], label='Inline label')
299-
# Overwrite the label by calling the method.
305+
ax.legend()
306+
307+
or::
308+
300309
line.set_label('Label via method')
310+
line, = ax.plot([1, 2, 3])
301311
ax.legend()
302312
303313
Specific lines can be excluded from the automatic legend element
304314
selection by defining a label starting with an underscore.
305-
This is default for all artists, so calling:meth:`legend` without
315+
This is default for all artists, so calling`Axes.legend` without
306316
any arguments and without setting the labels manually will result in
307317
no legend being drawn.
308318
319+
320+
**2. Labeling existing plot elements**
321+
322+
To make a legend for lines which already exist on the axes
323+
(via plot for instance), simply call this function with an iterable
324+
of strings, one for each legend item. For example::
325+
326+
ax.plot([1, 2, 3])
327+
ax.legend(['A simple line'])
328+
329+
Note: This way of using is discouraged, because the relation between
330+
plot elements and labels is only implicit by their order and can
331+
easily be mixed up.
332+
333+
334+
**3. Explicitly defining the elements in the legend**
335+
309336
For full control of which artists have a legend entry, it is possible
310337
to pass an iterable of legend artists followed by an iterable of
311338
legend labels respectively::
312339
313-
legend((line1, line2, line3), ('label1', 'label2', 'label3'))
340+
legend((line1, line2, line3), ('label1', 'label2', 'label3'))
314341
315342
Parameters
316343
----------
317344
345+
handles : sequence of `~.Artist`, optional
346+
A list of Artists (lines, patches) to be added to the legend.
347+
Use this together with *labels*, if you need full control on what
348+
is shown in the legend and the automatic mechanism described above
349+
is not sufficient.
350+
351+
The length of handles and labels should be the same in this
352+
case. If they are not, they are truncated to the smaller length.
353+
354+
labels : sequence of strings, optional
355+
A list of labels to show next to the artists.
356+
Use this together with *handles*, if you need full control on what
357+
is shown in the legend and the automatic mechanism described above
358+
is not sufficient.
359+
360+
Other Parameters
361+
----------------
362+
318363
loc : int or string or pair of floats, default: 'upper right'
319364
The location of the legend. Possible codes are:
320365

‎lib/matplotlib/figure.py‎

Lines changed: 18 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1373,6 +1373,24 @@ def legend(self, *args, **kwargs):
13731373
Parameters
13741374
----------
13751375
1376+
handles : sequence of `~.Artist`, optional
1377+
A list of Artists (lines, patches) to be added to the legend.
1378+
Use this together with *labels*, if you need full control on what
1379+
is shown in the legend and the automatic mechanism described above
1380+
is not sufficient.
1381+
1382+
The length of handles and labels should be the same in this
1383+
case. If they are not, they are truncated to the smaller length.
1384+
1385+
labels : sequence of strings, optional
1386+
A list of labels to show next to the artists.
1387+
Use this together with *handles*, if you need full control on what
1388+
is shown in the legend and the automatic mechanism described above
1389+
is not sufficient.
1390+
1391+
Other Parameters
1392+
----------------
1393+
13761394
loc : int or string or pair of floats, default: 'upper right'
13771395
The location of the legend. Possible codes are:
13781396

‎lib/matplotlib/legend.py‎

Lines changed: 14 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -286,9 +286,7 @@ def _update_bbox_to_anchor(self, loc_in_canvas):
286286

287287
classLegend(Artist):
288288
"""
289-
Place a legend on the axes at location loc. Labels are a
290-
sequence of strings and loc can be a string or an integer
291-
specifying the legend location
289+
Place a legend on the axes at location loc.
292290
293291
"""
294292
codes= {'best':0,# only implemented for axes legends
@@ -353,13 +351,22 @@ def __init__(self, parent, handles, labels,
353351
handler_map=None,
354352
):
355353
"""
356-
- *parent*: the artist that contains the legend
357-
- *handles*: a list of artists (lines, patches) to be added to the
358-
legend
359-
- *labels*: a list of strings to label the legend
360354
361355
Parameters
362356
----------
357+
parent : `.Axes` or `.Figure`
358+
The artist that contains the legend.
359+
360+
handles : sequence of `.Artist`
361+
A list of Artists (lines, patches) to be added to the legend.
362+
363+
labels : sequence of strings
364+
A list of labels to show next to the artists. The length of handles
365+
and labels should be the same. If they are not, they are truncated
366+
to the smaller of both lengths.
367+
368+
Other Parameters
369+
----------------
363370
364371
loc : int or string or pair of floats, default: 'upper right'
365372
The location of the legend. Possible codes are:

‎lib/matplotlib/pyplot.py‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -283,8 +283,8 @@ def pause(interval):
283283
This can be used for crude animation. For more complex animation, see
284284
:mod:`matplotlib.animation`.
285285
286-
Note
287-
----
286+
Notes
287+
-----
288288
This function is experimental; its behavior may be changed or extended in a
289289
future release.
290290
"""

‎lib/matplotlib/tests/test_legend.py‎

Lines changed: 6 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -40,9 +40,14 @@ def get_docstring_section(func, section):
4040

4141

4242
deftest_legend_kwdocstrings():
43-
stleg=get_docstring_section(mpl.legend.Legend.__init__,'Parameters')
4443
stax=get_docstring_section(mpl.axes.Axes.legend,'Parameters')
4544
stfig=get_docstring_section(mpl.figure.Figure.legend,'Parameters')
45+
assertstfig==stax
46+
47+
stleg=get_docstring_section(mpl.legend.Legend.__init__,
48+
'Other Parameters')
49+
stax=get_docstring_section(mpl.axes.Axes.legend,'Other Parameters')
50+
stfig=get_docstring_section(mpl.figure.Figure.legend,'Other Parameters')
4651
assertstleg==stax
4752
assertstfig==stax
4853
assertstleg==stfig

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