pandas.DataFrame.insert

DataFrame.insert(loc, column, value, allow_duplicates=False)

Insert column into DataFrame at specified location.

If allow_duplicates is False, raises Exception if column is already contained in the DataFrame.

Parameters:

loc : int

Must have 0 <= loc <= len(columns)

column : object

value : int, Series, or array-like

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Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.DataFrame.insert.html