On Sun, Nov 12, 2017 at 3:18 PM, Nick Coghlan <ncoghlan@gmail.com> wrote:
P.S. As a user, it's also genuinely irritating to have to always type
the "python -m " prefix when inside an active virtual environment, as
in that case, there isn't any ambiguity about which environment pip
should be manipulating or which version of Python it should be using.

and not just there :-)

I decided a year or two ago to recommend "python -m pip install" to my beginning students, and put it all my course documentation. I've done this for a while now.

but last week, when I introduced pytest -- I said, if you haven't' installed pytest yet, do it now -- and then proceeded to type:

pip install pytest

In my terminal, projecting in a huge font  for all the class to see.

It's just too ingrained and easy.

And the truth is, it actually works MOST of the time.

And if it doesn't work right, you are either a semi-sophisticated user that needs multiple pythons accessible from your shell, or your system is mis-configured.

Pain though it is, it's probably better to help newbies configure their systems correctly than to try to get everyone to invoke pip differently.

In fact, I have a little excercise that my students do as teh very first thing in class:


If you don't want to go read that:

I give them this code:

(not as a downloadable python file)

#!/usr/bin/env python

import sys
print("This is my first python program")

version = sys.version_info

if version.major == 3:
    if version.minor != 6:
        print("You should be running version 3.6")
        print("You are running python3.6 -- all good!")
    print("You need to run Python 3!")
    print("This is version: {}.{}".format(version.major, version.minor))

And I have them put it in a file, save it and run it however they want to run it.

I then know that they:

Know how to create a new python file, put some code in it and run that code.


They are running the version of Python I want them to run.

(though to be fair, I had one student struggling for weeks with "strange" errors, because his PyCharm was setup to run python2. He probably started using PyCharm after he ran that script some other way...)

I suppose I should do something similar to check that they have pip properly configured also, but to some extent, that comes up the first time I have them pip install something -- which is in the first class anyway :-)



Christopher Barker, Ph.D.

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