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Customised dashed linstyle in matplotlib.cycler throws ValueError when using in Axes.set_prop_cycle #15825

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sdschmidt opened this issue Dec 3, 2019 · 0 comments · Fixed by #15827
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Customised dashed linstyle in matplotlib.cycler throws ValueError when using in Axes.set_prop_cycle #15825

sdschmidt opened this issue Dec 3, 2019 · 0 comments · Fixed by #15827
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topic: rcparams
Milestone
v3.3.0

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@sdschmidt
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sdschmidt commented Dec 3, 2019 •
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Bug report

Bug summary

Using a cycler from matplotlib with a customised dashed linestyle for the property cycle in Axes.set_prop_cycle throws a ValueError (see below). Importing cycler from cycler works as expected.

Code for reproduction

import matplotlib.pyplot as plt
from matplotlib import rcParams
from matplotlib import cycler # from cycler import cycler works fine

cc = cycler('linestyle', [(0,(3,1)), '-'])

fig = plt.figure()
ax = fig.add_subplot(221)
ax.set_prop_cycle(cc)
ax.plot(range(10))

Actual outcome

Traceback (most recent call last):
  File "err.py", line 10, in <module>
    ax.plot(range(10))
  File "/usr/local/lib/python3.7/site-packages/matplotlib/axes/_axes.py", line 1665, in plot
    lines = [*self._get_lines(*args, data=data, **kwargs)]
  File "/usr/local/lib/python3.7/site-packages/matplotlib/axes/_base.py", line 225, in __call__
    yield from self._plot_args(this, kwargs)
  File "/usr/local/lib/python3.7/site-packages/matplotlib/axes/_base.py", line 405, in _plot_args
    seg = func(x[:, j % ncx], y[:, j % ncy], kw, kwargs)
  File "/usr/local/lib/python3.7/site-packages/matplotlib/axes/_base.py", line 312, in _makeline
    seg = mlines.Line2D(x, y, **kw)
  File "/usr/local/lib/python3.7/site-packages/matplotlib/lines.py", line 377, in __init__
    self.set_linestyle(linestyle)
  File "/usr/local/lib/python3.7/site-packages/matplotlib/lines.py", line 1186, in set_linestyle
    cbook._check_in_list([*self._lineStyles, *ls_mapper_r], ls=ls)
  File "/usr/local/lib/python3.7/site-packages/matplotlib/cbook/__init__.py", line 2170, in _check_in_list
    .format(v, k, ', '.join(map(repr, values))))
ValueError: '(0, (3, 1))' is not a valid value for ls; supported values are '-', '--', '-.', ':', 'None', ' ', '', 'solid', 'dashed', 'dashdot', 'dotted'

Expected outcome

I would expect matplotlib.cycler to work the same as cycler.cycler. However, in this case matplotlib.cycler throws a ValueError.

Matplotlib version

  • Operating system: macOS Mojave 10.14.6
  • Matplotlib version: 3.1.2
  • Matplotlib backend (print(matplotlib.get_backend())): MacOSX
  • Python version: 3.7.4
  • Jupyter version (if applicable): --
  • Other libraries: --

matplotlib installed via pip
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topic: rcparams
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Fix validation of linestyle in rcparams and cycler. anntzer/matplotlib
3 participants
@QuLogic @anntzer @sdschmidt