[Python] Verbose level with argparse and multiple -v options

I'd like to be able to specify different verbose level, by adding more -v options to the command line. For example:

$ myprogram.py
$ myprogram.py -v
$ myprogram.py -vv
$ myprogram.py -v -v -v


would lead to verbose=0, verbose=1, verbose=2, and verbose=3 respectively. How can I achieve that using argparse?

Optionally, it could be great to also be able to specify it like

$ myprogram -v 2

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