Backport PR #39023 on branch 1.2.x (Fix regression in setitem when expanding DataFrame with specific column name format)#39032

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jreback merged 1 commit intopandas-dev:1.2.xfrom

meeseeksmachine:auto-backport-of-pr-39023-on-1.2.x

Jan 8, 2021

Commits on Jan 8, 2021

Backport PR #39023: Fix regression in setitem when expanding DataFrame with specific column name format

phofl
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meeseeksmachine
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