CLN: PEP8 cleanup of holiday.py
Merge pull request #8085 from mortada/pep8_cleanup

CLN: PEP8 cleanup of holiday.py
BUG: fix iat and at for Float64Index
Merge pull request #8094 from cpcloud/float64index-iat-at

BUG: fix iat and at for Float64Index
Merge remote-tracking branch 'upstream/master'