python - How to check if an argument from commandline has been set? -

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i can call script this:

python d:\myscript.py 60

and in script can do:

arg = sys.argv[1] foo(arg)

but how test if argument has been entered in command line call? need this:

if isset(sys.argv[1]):     foo(sys.argv[1]) else:     print "you must set argument!!!"

don't use sys.argv handling command-line interface; there's module that: argparse.

you can mark argument required passing required=true add_argument.

import argparse parser = argparse.argumentparser(description='process integers.') parser.add_argument("foo", ..., required=true) parser.parse_args()

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