In the following Python snippet, why do arguments -h and –commandfile work but -c does not and further when I use -c, the error does not like sys.ext(2)

Here is the code:

    #!/bin/python
    import sys, getopt
    try:
        opts, args = getopt.getopt(sys.argv[1:],"hn:p:",["commandfile=","pkeyname="])
    except getopt.GetoptError:
        print('Error')
        sys.ext(2)
    
    #   parse the args
    for opt, arg in opts:
        if opt == '-h':
            print('endorse.py [-c,--commandfile] <parent commandfile> <parent keyname> [-k --pkeyname]')
            sys.exit()
        elif opt in ("-c", "--commandfile"):
            print (arg)
        elif opt in ("-k", "--pkeyname"):
            pkeyname = arg