CLN: Avoiding casting

[ShaharNaveh]

• closes #xxxx
• tests added / passed
• passes black pandas
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

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Follow up to #32794 (comment)

[WillAyd]

Looks good. Could reduce the number of comments but not a blocker for me

@jbrockmendel were there any reasons to use shape instead of len with memory views? I think I remember you mentioning something about that.

[jbrockmendel]

were there any reasons to use shape instead of len with memory views? I think I remember you mentioning something about that.

Yah, for nearly the exact same reason its being done here: the .shape lookup happens in c-space while the __len__ call goes into pyspace. IIRC thats unintentional and expected to be changed in cython 0.30

LGTM; agreed that the comments can be less verbose, just one-liners TODO(cython0.30): use len instead of shape[0]

[WillAyd]

LGTM; agreed that the comments can be less verbose, just one-liners TODO(cython0.30): use len instead of shape[0]

@MomIsBestFriend can you do this?

[jreback]

thanks @MomIsBestFriend

should make an issue to change this once cython 0.30 is out