cannot import name _preprocess_data

[engr-Eghbali]

Hi guys I have problem with importing packages,some of them figured out but this one is still remaining:

/usr/lib64/python2.7/site-packages/matplotlib/colors.py:345: MatplotlibDeprecationWarning: The is_string_like function was deprecated in version 2.1.
  if not cbook.is_string_like(arg) and cbook.iterable(arg):
/usr/lib64/python2.7/site-packages/matplotlib/colors.py:737: MatplotlibDeprecationWarning: The is_string_like function was deprecated in version 2.1.
  not cbook.is_string_like(colors[0]):
Traceback (most recent call last):
  File "sm.py", line 39, in <module>
    import matplotlib.pyplot as plt  # to plot
  File "/usr/lib64/python2.7/site-packages/matplotlib/pyplot.py", line 26, in <module>
    from matplotlib.figure import Figure, figaspect
  File "/usr/lib64/python2.7/site-packages/matplotlib/figure.py", line 36, in <module>
    from matplotlib.axes import Axes, SubplotBase, subplot_class_factory
  File "/usr/lib64/python2.7/site-packages/matplotlib/axes/__init__.py", line 4, in <module>
    from ._subplots import *
  File "/usr/lib64/python2.7/site-packages/matplotlib/axes/_subplots.py", line 10, in <module>
    from matplotlib.axes._axes import Axes
  File "/usr/lib64/python2.7/site-packages/matplotlib/axes/_axes.py", line 17, in <module>
    from matplotlib import _preprocess_data
ImportError: cannot import name _preprocess_data

• Operating system:centos7x64
• Matplotlib version: 2.2.3
• Python version:2.7.5
• Jupyter version :4.4.0
  installed matplotlib and ipython from pip.

[WeatherGod]

If you are having difficulty importing packages, especially submodules like this, then chances are your environment is somehow corrupt overall. I also find it odd that you are getting those warnings upon import...

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On Wed, Dec 12, 2018 at 3:50 PM reza-eghbali ***@***.***> wrote: Hi guys I have problem with importing packages,some of them figured out but this one is still remaining: /usr/lib64/python2.7/site-packages/matplotlib/colors.py:345: MatplotlibDeprecationWarning: The is_string_like function was deprecated in version 2.1. if not cbook.is_string_like(arg) and cbook.iterable(arg): /usr/lib64/python2.7/site-packages/matplotlib/colors.py:737: MatplotlibDeprecationWarning: The is_string_like function was deprecated in version 2.1. not cbook.is_string_like(colors[0]): Traceback (most recent call last): File "sm.py", line 39, in <module> import matplotlib.pyplot as plt # to plot File "/usr/lib64/python2.7/site-packages/matplotlib/pyplot.py", line 26, in <module> from matplotlib.figure import Figure, figaspect File "/usr/lib64/python2.7/site-packages/matplotlib/figure.py", line 36, in <module> from matplotlib.axes import Axes, SubplotBase, subplot_class_factory File "/usr/lib64/python2.7/site-packages/matplotlib/axes/__init__.py", line 4, in <module> from ._subplots import * File "/usr/lib64/python2.7/site-packages/matplotlib/axes/_subplots.py", line 10, in <module> from matplotlib.axes._axes import Axes File "/usr/lib64/python2.7/site-packages/matplotlib/axes/_axes.py", line 17, in <module> from matplotlib import _preprocess_data ImportError: cannot import name _preprocess_data - Operating system:centos7x64 - Matplotlib version: 2.2.3 - Python version:2.7.5 - Jupyter version :4.4.0 installed matplotlib and ipython from pip. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#12981>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AARy-OkWYRZ43INCgxNqw6OSudQlRK1rks5u4WwwgaJpZM4ZQbIv> .

[tacaswell]

How exactly did you install things?

You said you used pip, but the imports are coming from system owned paths. My guess is you had the centos python-matplotlib package installed and then sudo pip install matplotlib on top of that?

[engr-Eghbali]

@tacaswell Thanks for your replay,
in fact,I'm using centos with developer packages which is containing py and some other things by default.
and yes...I had not pip and installed it by yum and then matplotlib by pip.
Do you suggest I remove/reinstall all py and its dependencies ?

[WeatherGod]

As a general rule, you should not mix packages from your distro's repository and from pip. The packages you get from yum have all been tested and verified against each other, not against packages from pip. Also, pip may end up mangling the system python environment, which would not be good for your OS. The recommended approaches are: 1) exclusively use packages from yum/apt/homebrew, 2) use virtualenvs (which create user-space python environments so you don't need to do "sudo pip install", 3) use a user-space package manager like miniconda/anaconda or canopy. Never, never, never do `sudo pip install ...`. I learned this the hard way several years ago and completely borked my OS at one point.

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On Thu, Dec 13, 2018 at 3:31 AM reza-eghbali ***@***.***> wrote: @tacaswell <https://github.com/tacaswell> Thanks for your replay, in fact,I'm using centos with developer packages which is containing py and some other things by default. and yes...I had not pip and installed it by yum and then matplotlib by pip . Do you suggest I remove/reinstall all py and its dependencies ? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#12981 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AARy-POfUht8GcCkH8dKZHLvOSvFZV6Iks5u4hBggaJpZM4ZQbIv> .

[timhoffm]

Appears to be caused by mixing conda system packaging and pip.

[TAC edited to replace conda -> system]

[simonhou]

Hi @engr-Eghbali ,
I also met this problem. Have you already fixed this problem?

[engr-Eghbali]

Hi @engr-Eghbali ,
I also met this problem. Have you already fixed this problem?

Hi, No I didn't ... finally used online interpreters.
I never told that I mixed conda and pip, they closed this issue on their own!

[tacaswell]

This is definitely an installation issue. I suggest removing everything and re-installing either via the system package manager or by creating a user-space enviroment and using pip. You should almost never do sudo pip install ....