Installation Failed ( pyEDFlib requires a version of NumPy, even for setup ) about cardio

[Shlyankin]

@roman-kh ,
I already have numpy. I think problem in the python version. I installed python 3.6.1 (instead of 3.7.4) and downloaded cardio using pipenv. It seems to work.

From this post holgern/pyedflib#60, I think that pyEDFlib have not binaries files for python 3.7.

[roman-kh]

Apparently the problem has nothing to do with cardio on its own.
The thing is that you don't have numpy installed while it's required by pyedflib.
The question "why python tries to install pyedflib before numpy" is a notorious example of questions hardy ever answered as there is a long-existing problem with a weird install order (e.g. pypa/pip#24).

As a workaround, install numpy first, then install cardio.