get directory name of file being executed

[David N. Welton]

In Tcl, you do this with 'info script'.

I'm doing this:

/usr/bin/python2 /some/script/in/a/dir/foo.py

I want to get "/some/script/in/a/dir/", not the cwd of where I
launched the script from.

Is that possible?

Thankyou,
-- 
David N. Welton
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