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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?
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If you have installed many versions of Python, then #!/usr/bin/env ensures that the interpreter will use the first installed version on your environment's $PATH. If you are using Unix, an executable file that is meant to be interpreted can indicate what interpreter to use by having a #!
If the shell scripts start with #!/bin/bash , they will always run with bash from /bin . If they however start with #!/usr/bin/env bash , they will search for bash in $PATH and then start with the first one they can find.
#!/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.
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