[Python] How to require arguments in argparse and make them non-positional?

I have a Python script where I would like to force all required arguments to be named (non-positional).

So the following should work:

python myscript --arg1 arg1 --arg2 arg2
python myscript --arg2 arg2 --arg1 arg1


But the following should fail:

python myscript arg1 arg2
python myscript --madeUpArg arg1 --arg2 arg2


From what I can tell, in argparse if you make something required, it becomes a positional argument, so both of the second examples that I want to fail will succeed (even the second case, with the made up argument!). How do I get desired functionality?

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