Substitute environment variables in a string
Project description
Substitute environment variables in a string:
>>> import os
>>> from envsubst import envsubst
>>> del os.environ['PS1']
>>> print(envsubst('$USER@$HOST ${PS1:-$}:'))
ashafer01@github.com $:
>>> os.environ['PS1'] = ''
>>> print(envsubst('$USER@$HOST ${PS1:-$}:'))
ashafer01@github.com $:
>>> print(envsubst('$USER@$HOST ${PS1-foo}:'))
ashafer01@github.com :
>>> os.environ['DEFAULT_PROMPT'] = '$'
>>> print(envsubst('$USER@$HOST ${PS1:-$DEFAULT_PROMPT}:'))
Also supports $0, $1, etc. from argv.
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