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DOC: Clarify index_col behavior for read_csv #39006

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Jan 6, 2021
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DOC: Clarify index_col behavior for read_csv #39006

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5 changes: 3 additions & 2 deletions doc/source/user_guide/io.rst
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Expand Up @@ -112,8 +112,9 @@ index_col : int, str, sequence of int / str, or False, default ``None``

The default value of ``None`` instructs pandas to guess. If the number of
fields in the column header row is equal to the number of fields in the body
of the data file, then a default index is used. If it is one larger, then
the first field is used as an index.
of the data file, then a default index is used. If it is larger, then
the first columns are used as index so that the remaining number of fields in
the body are equal to the number of fields in the header.
usecols : list-like or callable, default ``None``
Return a subset of the columns. If list-like, all elements must either
be positional (i.e. integer indices into the document columns) or strings
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