Raise error in usecols when column doesn't exist but length matches#16460

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TomAugspurger merged 3 commits intopandas-dev:masterfrom

bpraggastis:gh-14671

Jun 4, 2017

Commits on Jun 4, 2017

gh-14671 Check if usecols with type string contains a subset of names, if not throws an error

brendapraggastis
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TomAugspurger
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tests added for gh-14671, expected behavior of simultaneous use of usecols and names unclear so these tests are commented out

brendapraggastis
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TomAugspurger
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TomAugspurger
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