[issue41626] port shebang of tools from python2 to python3

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

To address some of the concerns:

- The shebang line in Mac/BuildScript/build-installer.py can be safely removed.

- "Lib/idlelib/pyshell.py for example, maybe the IDLE entry point is just a symlink to that file"
It's not, at least for unix-y builds. In [install-prefix], an "idle*" script is installed of the form:

#![install-prefix]/bin/python3.10

from idlelib.pyshell import main
if __name__ == '__main__':
    main()

So there is an abolute link to the correct interpreter and shebang is not used.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue41626>
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