Hello again, I found the solution : in file transforms.py I
> changed the lines 181-183 by replacing :
> from _transforms import ...
It looks like your matplotlib directory is out of whack. You should
remove the entire build tree and start over. In matplotlib-0.63,
_transforms.so does not exist; it is replaced by
_lib/matplotlib/_transforms.py, which imports either the _na or _nc
So even though you got it to work, that you had a problem at all
indicates your src directory is messed up, and so I advise you to get
a clean start.