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pythonpathenvironmentshebang
Ken
Ken

Reputation: 4163

What's the difference between python shebangs with /usr/bin/env rather than hard-path?

I used to use the shebang 

#!/usr/bin/env python

When is it better to use

#!/usr/bin/python

What is the exact difference between them?

Upvotes: 77

Views: 26128

Answers (1)

vartec
vartec

Reputation: 134691

#!/usr/bin/python is hardcoded to always run /usr/bin/python, while #!/usr/bin/env python will run whichever python would be default in your current environment (it will take in account for example $PATH, you can check which python interpreter will be used with which python).

The second way ( #!/usr/bin/env python ) is preferred , as it's not dependent on particular installation. It will work for example with virtualenv setups or systems where there is no /usr/bin/python, but only e.g. /usr/local/bin/python.

Upvotes: 97

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