'What does sys.path.append("..") do?

I bumped into this statement in a python script : sys.path.append("..") I did some research, but I could not find what does it do.

I know sys.path.append() function appends a path at the end of the PYTHONPATH list. But what does ".." stand for?

Needless to say that this python scripts does not work if I comment the line.



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