accessing environment variable in python script when called from a shell script differs from running it in the shell directly

Question

I have a shell script which is calling the python script

#!/bin/bash

sudo python test.py

test.py is accessing some environment variable

os.getenv('MYKEY')

I get None when python script is being called from shell script. However it works fine if test.py is executed directly from the shell.

Please help

Answer 1

几乎可以肯定的是，在调用shell脚本之前，没有export MYKEY ，因此shell脚本实际上无权访问MYKEY ，因此python脚本也无权访问它。

Answer 2

sudo does not keep environment variables by default.

See how to keep environment variables when using sudo .

Here is what I did to reproduce your result.

$ export MYKEY=5
$ python test.py
5
$ sudo python test.py
None

Your shell script should give the same result if you use python test.py rather than sudo python test.py . If you still want to use sudo , then you would need to use sudo -E bash -c 'python test.py' .