python 2.7 functools_lru_cache虽然已安装但未导入

问题描述

当我尝试导入matplotlib时出现错误

When I try to import matplotlib I get an error

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/__init__.py", line 128, in <module>
  from matplotlib.rcsetup import defaultParams, validate_backend, cycler
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/rcsetup.py", line 29, in <module>
    from matplotlib.fontconfig_pattern import parse_fontconfig_pattern
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/fontconfig_pattern.py", line 32, in <module>
    from backports.functools_lru_cache import lru_cache
ImportError: No module named functools_lru_cache

本身可以正确地反向导入.当我尝试通过以下方式手动安装functools时

backports itself imports properly. When I try to install functools manually via

sudo pip install backports.functools_lru_cache

我得到的信息

Requirement already satisfied: backports.functools_lru_cache in /usr/local/lib/python2.7/dist-packages

尽管如此，当我尝试

import backports.functools_lru_cache

我得到的信息

ImportError: No module named functools_lru_cache

系统信息Ubuntu 16Python 2.7.12点9.0.1

System infoUbuntu 16Python 2.7.12Pip 9.0.1

推荐答案

如果仍然存在该问题并重新安装backports.functools_lru_cache，则在我的情况下无法正常工作，则可能是安装了较旧版本的matplotlib会工作.例如:

If someone is still having that problem and reinstalling backports.functools_lru_cache do not work in his case, as it was in my case, then probably installing older version of matplotlib would work. For example:

pip install matplotlib==2.0.2

版本2.2.0出现问题，我切换到2.0.2，现在可以正常工作了.我没有检查其他版本.

Problem occurred for version 2.2.0, I switched to 2.0.2 and it is working now. I did not check other versions.

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