Fastai v0.7 - python version dependency?

I’m struggling to find confirmation on which version of python is needed to run fastai v0.7 as needed in the course.

I’m running python 3.6.6 in virtual conda environment.

I think this is why I get the following error, when running - conda env update in Windows 10:
Command “python egg_info” failed with error code 1 in C:\Users\Chris\AppData\Local\Temp\pip-install-2i51a3yj\shapely\