feat: guess python package name by replacing dash to underscore

[goatwu1993]

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Fixes #1229 🦕

[chingor13]

Thanks for this.

Can we add a test for this?

[bcoe]

@goatwu1993 just a friendly nudge, looks like @chingor13 has a couple outstanding questions.

[goatwu1993]

I had updated with the set/iteration.

Test is lacking still. I checked the test and seems difficult to use sinom to stub a directory with name with dash replaced with underscore😖.

Any hint?