python - Calling the shell commands from os.system not working -


i'm new python , have code this:

os.system(''' prompt_command="printf '%*s\n' "${columns:-$(tput cols)}" '' | tr ' ' -" ''')

the part:

prompt_command="printf '%*s\n' "${columns:-$(tput cols)}" '' | tr ' ' -"

does print - fill shell width. above command working expected in command prompt. when did in python. i'm getting no output @ all.

there no point of issuing command @ all.

as understand it, setting environment variable prompt_command in order make shell execute on every prompt.

but setting environment variable has impact of called shell, not caller. cannot change environment of parent process.


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