pandas.DataFrame.set_value
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DataFrame.set_value(index, col, value, takeable=False)
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Put single value at passed column and index Parameters: index : row label col : column label value : scalar value takeable : interpret the index/col as indexers, default False Returns: frame : DataFrame If label pair is contained, will be reference to calling DataFrame, otherwise a new object 
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Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.DataFrame.set_value.html