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Raise exception in read_csv when prefix is set, but not used because a header exists #27998

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Raise exception in read_csv when prefix is set, but not used because a header exists #27998

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ae942f3
GH27394
PraneethKhanna Aug 18, 2019
2a1173c
GH27998
PraneethKhanna Aug 20, 2019
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2 changes: 2 additions & 0 deletions pandas/io/parsers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1930,6 +1930,8 @@ def __init__(self, src, **kwds):
]
else:
self.names = list(range(self._reader.table_width))
elif self.prefix:
raise ValueError("argument prefix must be None if no headers provided")

# gh-9755
#
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