In Python, is there a better way to deal with command line options when each option could have several arguments?

If you found argparse to be too hard to get started with because of the complexity, then you would probably like plac which is available on PyPi. It is a wrapper around argparse which hides the complexity, and it takes care of a lot of boilerplate argument checking for you.

I think that argparse is the way to go. It does a great job, it is easy to use and in the standard library since 2.7. Take a look a the nargs argument. From the docs.

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