Python - temporarily modify the current process's environment

Question

I use the following code to temporarily modify environment variables.

@contextmanager
def _setenv(**mapping):
    \"\"\"``with`` context to temporarily modi         


        

Answer 1

Using the gist here, you can save/restore local, global scope variable and environment variables: https://gist.github.com/earonesty/ac0617a5672ae1a41be1eaf316dd63e4

import os
from varlib import vartemp, envtemp

x = 3
y = 4

with vartemp({'x':93,'y':94}):
   print(x)
   print(y)
print(x)
print(y)

with envtemp({'foo':'bar'}):
    print(os.getenv('foo'))

print(os.getenv('foo'))

This outputs:

93
94
3
4
bar
None