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1.PYTHONSTARTUP: It contains the way of an instatement record containing Python source code. It is named as .pythonrc.py in unix and it contains directions that heap utilities or alter PYTHONPATH 2.PYTHONCASEOK: It is utilized in Windows to train Python to locate the primary case-obtuse match in an import articulation. Set this variable to any an incentive to enact it 3.PYTHONHOME: It is an elective module seek way. It is typically implanted in the PYTHONSTARTUP or PYTHONPATH registries to make exchanging module libraries simple

PYTHONSTARTUP is a situation variable you will characterize indicating the area of the way to a python document. This python content will be controlled by python before beginning the python intuitive mode. Where as PYTHONHOME is the standard condition variable used to follow the base of the present python establishment. It is set/unset also by virtualenv itself.

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