Should I Use a Shebang in My Python Scripts, and If So, Which One?

Should I Include the Shebang in Python Scripts?

A shebang line in a script allows it to be executed directly from the terminal or through file managers without having to specify the python command explicitly. While its inclusion is optional, it's generally considered a convenient practice.

Choosing the Correct Shebang Form

The form of the shebang line is crucial for ensuring script portability. The correct syntax for:

Python 3 Scripts:

#!/usr/bin/env python3

Python 2 Scripts:

#!/usr/bin/env python2

Avoid the Generic Shebang:

#!/usr/bin/env python

This should not be used unless the script is compatible with both Python 2 and 3.

Why These Specific Forms?

As per PEP 394, python can refer to either python2 or python3 on different systems. Using specific versions in the shebang ensures the expected interpreter is used.

Recommendations:

Avoid using

#!/usr/local/bin/python

because python may be installed at different locations, rendering the shebang ineffective.

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