python 2.7 functools_lru_cache does not import although installed

Question

When I try to import matplotlib I get an error

Traceback (most recent call last):
  File \"\", line 1, in 
  File \"/usr/local/lib         


        

Answer 1

The pip command was actually the pip3, and the "ImportError" was happening when I used python (2.7).

pip2 uninstall backports.functools_lru_cache

then,

pip2 install backports.functools_lru_cache

fixed my problem.