matplotlibrc prop_cycle error

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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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
_______________________________________________
Matplotlib-users mailing list
Matplotlib-users at python.org
https://mail.python.org/mailman/listinfo/matplotlib-users

Emlyn,

The matplotlibrc parser is not very smart; it is parsing each line
independently, but our matplotlibrc.template is giving a commented-out
example like what you show--with multiple lines to the entry. This is a
bug. The workaround is to concatenate the lines so that the
axes.prop_cycle entry is a single line.

Thank you for the report, which I have copied to the issue tracker:
https://github.com/matplotlib/matplotlib/issues/9184

Eric

···

On 2017/09/13 12:17 PM, Emlyn Price 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