#!/usr/bin/env python

# import required modules
#
import os
import sys

# main: this is the main function of this Python
#
def main(argv):

    # let's add some command line argument processing
    #


    # first method
    #
    with open(sys.argv[1]) as f:
        for line in f:
            if (line[0] != '#'):
                print("1st method: ", line)
    f.close()

    # second method
    #
    for line in open(sys.argv[1],'r').readlines():
        print("2nd method: ", line)

    # third method
    #
    lines = [line.rstrip('\n') for line in open(sys.argv[1])]
    print("3rd method: ", lines)

# begin gracefully
#
if __name__ == "__main__":
    main(sys.argv)

#
# end of file