[Tutor] Installing python and numpy on the Mac (OSX)

[giacomo.boffi at gmail.com]

Peter Hodges <designx1000 at gmail.com> writes:

> Hi. I downloaded Python 3.6 from the python site, then followed online
> directions for pip to install numpy (in users? —user was in the
> example).
> When I start IDLE in the Python 3.6 in Applications and then type
> import numpy as np I get the following:
> import numpy as np
> Traceback (most recent call last):
>   File "<pyshell#0>", line 1, in <module>
>     import numpy as np
> ModuleNotFoundError: No module named ‘numpy'
>
> Does this mean I need to set the $PATH with some new pathname?

no

> Or move the numpy directory into the python 3.6 directory?

no

> Or?

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first, (optional but I'd reccommend to) disinstall numpy using the same
pip script that you used to install it, something like

$ pip uninstall numpy # possibly using sudo
----
next, you must be sure that Python 3.6 has pip, either

$ /path/to/python3.6 -m ensurepip --user

or (if you are installing in a virtual environment)

$ /path/to/python3.6 -m ensurepip

the above is going to install pip if it is not already present in the
environment of Python 3.6 --- please see
    https://docs.python.org/3/library/ensurepip.html
for the gory details
----
finally, install numpy for 3.6

$ /path/to/python3.6 -m pip install --user numpy
----

The command "/path/to/python3.6 -m modulename ..." ensures that the
module and the Python version are matching one with the other.