<p>当我尝试导入matplotlib时，我得到一个错误</p>
<pre><code>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
</code></pre>
<p>后端口本身正确导入。当我尝试通过</p>
<pre><code>sudo pip install backports.functools_lru_cache
</code></pre>
<p>我得到消息说</p>
<pre><code>Requirement already satisfied: backports.functools_lru_cache in /usr/local/lib/python2.7/dist-packages
</code></pre>
<p>不过，当我试图</p>
<pre><code>import backports.functools_lru_cache
</code></pre>
<p>我得到消息说</p>
<pre><code>ImportError: No module named functools_lru_cache
</code></pre>
<p>系统信息
乌班图16
Python2.7.12
Pip 9.0.1点</p>
