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usage: a.py [-h] -f [F] -a [A] -o [O]

  -h, --help  show this help message and exit

test1
  -f [F]      create a file

test2
  -a [A]      load a file
  -o [O]      load a file

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a.py test1 -f t.txt
a.py test2 -f t.txt -o x.txt

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import argparse

if __name__ == '__main__':
     
    parser = argparse.ArgumentParser()
    #test1
    parser.add_argument('-f', nargs='?', required=True,
                       help='create a file')
    
    #test2    
    parser.add_argument('-f', nargs='?', required=True,
                       help='load a file')
    
    parser.add_argument('-o', nargs='?', required=True,
                       help='load a file')    
    args = parser.parse_args()