`pip install pkg❮1.999` ? (intermediate) anthony explains #414

today I show an oddity of a requirements file due to an old behaviour of pip (and a rather surprising behaviour of `packaging`!)

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[marcinbazydlo]

Hi Anthony, not related to current video - could you make a video about why you're using exit() ? ;) I've noticed that on the end of file you always call exit with results of main function as an argument. I know how exit, quit, sys.exit etc works, but WHY to use it if it's end of script anyway ? :)

[_baco]

I wonder if the bug also happened declaring the dependency as:

refactorlib[cheetah]~=0.15.0

[andrewrosss]

it seems like having wat 2.0a1 installed by running `pip install --pre 'wat>=1, <2'` is the expected behaviour.

The `--pre` flag is set indicating that pre-releases and development versions are to be included, and 2.0a1 seems to satisfy the constraint: 1.0 <= x < 2.0.

Did this get changed because it was too much of foot gun or is it actually _not_ the expected behaviour (and I'm just missing something)?

[RoelAdriaans]

As someone who's working with python 2.6 and 2.7 on a daily basis: Yes, I've got bigger problems then an outdated pip.. :D