MAINT: Drop Python 3.7 from the wheel builds.

[charris]

No description provided.

[simonjayhawkins]

@charris for pandas we are still planning a couple of releases on 1.3.x before we drop Python 3.7 support according to NEP 29 pandas-dev/pandas#41678. I am curious as to why numpy has stopped building the wheels now and should we do the same?

[rgommers]

This PR drops them in master, which is for the next minor release (1.22.0, planned for December). This repo also has a v1.21.x branch, so we can still make 3.7 releases there. I imagine you can do the same, assuming you want to drop 3.7 for pandas 1.4.0 (depends on NEP 29 timing)?

[simonjayhawkins]

Thanks @rgommers I didn't release this repo used more than one branch. In https://github.com/MacPython/pandas-wheels we only have the one branch.

yes for https://github.com/pandas-dev/pandas we have already dropped 3.7 from master. the next pandas release from master will be 1.4 at the end of the year.