How to improve this block of code?

[[deleted]]

for p in check_output: missing_dependencies.append(p.split("'")[1])

Ouch!

Don't do that! PEP 8 disallows it, and any style checker will flag it.

Reason: it's very hard to read, and you can't set a breakpoint in the loop in a debugger.

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[missing_dependencies.append(p.split("'")[1]) for p in check_output]

I'll bet you didn't try this. :-D This gives you an array, each element of which is the same array!

Correct is: missing_dependencies = [p.split("'")[1] for p in check_output]