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See my quick python2 edit at https://gist.github.com/junkblocker/c4b7f2417e62f0893021 . It needed os.path.expanduser(...) since my editor was set to ~/bin/vim and ~ is only expanded by shell without that.

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Shouldn't it be expanded by the shell when it is first set?

FOO=~/bin/vim export FOO env | grep FOO shows it as expanded.

You are running that in shell by hand. The python program running here is not shell. If you do a print(os.environ["GIT_EDITOR"]) in the python3 program you'll still see ~/bin/vim .

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