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DOC: add note to how pandas deduplicate header when read from file #57874

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Apr 1, 2024
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DOC: add note to how pandas deduplicate header when read from file #57874

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6 changes: 6 additions & 0 deletions pandas/io/parsers/readers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -195,6 +195,12 @@ class _read_shared(TypedDict, Generic[HashableT], total=False):
parameter ignores commented lines and empty lines if
``skip_blank_lines=True``, so ``header=0`` denotes the first line of
data rather than the first line of the file.

When inferred from the file contents, headers are kept distinct from
each other by renaming duplicate names with a numeric suffix of the form
``".{{count}}"`` starting from 1, e.g. ``"foo"`` and ``"foo.1"``.
Empty headers are named ``"Unnamed: {{i}}"`` or ``"Unnamed: {{i}}_level_{{level}}"``
in the case of MultiIndex columns.
names : Sequence of Hashable, optional
Sequence of column labels to apply. If the file contains a header row,
then you should explicitly pass ``header=0`` to override the column names.
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