[docs] [issue37726] Tutorial should not recommend getopt

mental m3nta1@yahoo.com added the comment:

It's nice to see the newcomer friendly tag being encouraged :thumbsup:

I'm submitting a PR for a doc change (I'd appreciate a review :D).

I've replaced any mention of getopt in the tutorial section with the argparse module. Additionally I have added several small examples of usage promoting its usability.

Should the section recommend using other dedicated packages for parsing: fire, click, docopt? urllib.request does this for the requests package.

---------- nosy: +mental

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