BUG: Pip 20.3 is causing Linux py38 np dev pipeline to fail
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The first pipeline to fail was 2a115d5 which also was the first pipeline using pip 20.3
This seems to be a problem with scipy version.
@jreback @jbrockmendel @jorisvandenbossche
Last pipeline to work:
https://dev.azure.com/pandas-dev/pandas/_build/results?buildId=49130&view=logs&j=eab14f69-13b6-5db7-daeb-7b778629410b&t=71ac627c-7b38-59b1-014b-81753001ec5e
See pypa/pip#9186
So once this is fixed upstream, we should revert the pin.
Noting that, from my PoV, the underlying issue here is that pip's getting wheels with versions that are not valid (see pypa/pip#9186 (comment)) and this is the first version of pip where it rejects such wheels by default. The fix probably needs to happen wherever the wheels are being generated.