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[Tutor] SyntaxError: can't assign to literal while using ""blkid -o export %s | grep 'TYPE' | cut -d"=" -f3" % (fs)" using subprocess module in Python

Chris Angelico <rosuav at gmail.com> writes:

> No helper needed. Safe against command injection. Uses the known
> format of the command's output; if you want other information as well
> as the type, you could get that too.

Can someone let me in on this secret helper module? Doesn't seem to
match the helper module in PyPI at least.