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DOC: Mention default behaviour of index_col in readcsv #32977

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DOC: Mention default behaviour of index_col in readcsv #32977

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5 changes: 5 additions & 0 deletions doc/source/user_guide/io.rst
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Expand Up @@ -109,6 +109,11 @@ index_col : int, str, sequence of int / str, or False, default ``None``
Note: ``index_col=False`` can be used to force pandas to *not* use the first
column as the index, e.g. when you have a malformed file with delimiters at
the end of each line.

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.
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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