[CLN] resolve circular Period dependency, prepare setup.py#21854

Merged

jreback merged 4 commits intopandas-dev:masterfrom

jbrockmendel:reso

Jul 12, 2018

Commits on Jul 11, 2018

Commits on Jul 12, 2018

remove shim for old cython, move dict up, add reference
jbrockmendel
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Merge branch 'master' of https://github.com/pandas-dev/pandas into reso
jbrockmendel
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