Backport PR #27878 on branch 0.25.x (TST: Raise ValueError and suggestion to use header=None if header=-1 is pa…)#27938

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gfyoung merged 1 commit intopandas-dev:0.25.xfrom

meeseeksmachine:auto-backport-of-pr-27878-on-0.25.x

Aug 16, 2019

Commits on Aug 15, 2019

Backport PR #27878: TST: Raise ValueError and suggestion to use header=None if header=-1 is pa…

MarcoGorelli
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