It depends on what do you mean by "append", I guess. Append the search path (e.g. "try this one first"), then /path:$PYTHONPATH is correct. If you mean append t

It depends on what do you mean by "append", I guess. Append the search path (e.g. "try this one first"), then /path:$PYTHONPATH is correct. If you mean append the variable then your example is correct.