[Matplotlib-users] matplotlibrc prop_cycle error

[Scott Lasley]

It works if you remove the line breaks and have the axes.prop_cycle on one line instead of multiple lines.  

axes.prop_cycle    : cycler('color', ['1f77b4', 'ff7f0e', '2ca02c', 'd62728', '9467bd', '8c564b', 'e377c2', '7f7f7f', 'bcbd22', '17becf'])
                                            # color cycle for plot lines
                                            # as list of string colorspecs:
                                            # single letter, long name, or
                                            # web-style hex


> On Sep 13, 2017, at 6:17 PM, Emlyn Price <emlyn.je.price at gmail.com> wrote:
> 
> Hi,
> 
> I have been trying to set up a custom color cycle in matplotlib using the matplotlibrc file. I have encountered a problem with the default matplotlibrc file provided with the installation from Arch llinux's package manager and the example provided in the online documentation at: https://matplotlib.org/users/customizing.html
> 
> When the lines controlling the axes.prop_cycle are uncommented:
> 
> axes.prop_cycle    : cycler('color',
>                             ['1f77b4', 'ff7f0e', '2ca02c', 'd62728',
>                               '9467bd', '8c564b', 'e377c2', '7f7f7f',
>                               'bcbd22', '17becf'])
> 
> 
> the following message is generated when I import matplotlib:
> 
> /usr/lib/python3.6/site-packages/matplotlib/__init__.py:1078: UserWarning: Illegal line #338
>     "                            ['1f77b4', 'ff7f0e', '2ca02c', 'd62728',
> "
>     in file "/home/ejp/mpl_test/matplotlibrc"
>   warnings.warn('Illegal %s' % error_details)
> /usr/lib/python3.6/site-packages/matplotlib/__init__.py:1078: UserWarning: Illegal line #339
>     "                              '9467bd', '8c564b', 'e377c2', '7f7f7f',
> "
>     in file "/home/ejp/mpl_test/matplotlibrc"
>   warnings.warn('Illegal %s' % error_details)
> /usr/lib/python3.6/site-packages/matplotlib/__init__.py:1078: UserWarning: Illegal line #340
>     "                              'bcbd22', '17becf'])
> "
>     in file "/home/ejp/mpl_test/matplotlibrc"
>   warnings.warn('Illegal %s' % error_details)
> /usr/lib/python3.6/site-packages/matplotlib/__init__.py:1120: UserWarning: Bad val "cycler('color'," on line #337
>     "axes.prop_cycle    : cycler('color',
> "
>     in file "/home/ejp/mpl_test/matplotlibrc"
>     Key axes.prop_cycle: 'cycler('color',' is not a valid cycler construction: unexpected EOF while parsing (<string>, line 1)
>   (val, error_details, msg))
> 
> The same error is generated if I import cycler using 
> 
> import cycler
> 
> or 
> 
> from cycler import cycler
> 
> I am using matplotlib 2.0.2 in python version 3.6.2 installed from the Arch Linux repositories. 
> The ouput of uname -a is :Linux tinker 4.12.12-1-ARCH #1 SMP PREEMPT Sun Sep 10 09:41:14 CEST 2017 x86_64 GNU/Linux
> 
> To reproduce:
> 
> Copy the default matplotlibrc
> Uncomment the lines containing
> axes.prop_cycle    : cycler('color',
>                             ['1f77b4', 'ff7f0e', '2ca02c', 'd62728',
>                               '9467bd', '8c564b', 'e377c2', '7f7f7f',
>                               'bcbd22', '17becf'])
> Run python in the directory containing the matplotlibrc file
> Import matplotlib
> 
> Am I missing something obvious?
> Thanks,
> Emlyn
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