Perfomance reading

import pstats
import sys

def main():

    if len(sys.argv) > 1: file = sys.argv[1]
    else:
        if sys.version_info.major==3:
            file = input("Enter pathname:")
        else:
            file = raw_input("Enter pathname:")

        if file == "": file = r"C:\Users\User\Desktop\main.prof"

    p = pstats.Stats(file)
    p.strip_dirs().sort_stats(-1).print_stats()


if __name__ == '__main__':
    main()