In Python, run a version of a script by specifying its git commit hash

Question

Let's say I have a Python script called example.py which I've committed to git several times. Now what I want is to have a different script called run_example.py which relies on the first script and takes as a command-line (or configurable) argument the commit SHA hash of example.py it should use, e.g.

python run_example.py <desired SHA of example.py>

and thus by specifying a different commit hash, a different version of example.py would be referenced and run.

What's the cleanest way to achieve this?

You'd need to call a subprocess to check out a version of the file, or have a native python interface to git. Either way, you are likely looking for a third party tool. — Mad Physicist
– Mad Physicist, Commented Jul 18, 2019 at 19:29

Jake Worth · Accepted Answer · 2019-07-18 20:03:34Z

1

One option: make a temporary version of your script at the desired revision, then delete it when finished:

$ git show <desired SHA>:example.py > tmp-example.py
$ python run_example.py tmp-example.py
$ rm tmp-example.py

answered Jul 18, 2019 at 20:03

Jake Worth

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2 Comments

ElpieKay Over a year ago

I wrote a demo and tried git show <desired SHA>:example.py | python, and it worked. But not sure if it's okay for all cases.

Jake Worth Over a year ago

Cool! I guess that could be a little risky in some cases. If it works for you, let me know and I’ll update the answer.

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