pandas.DataFrame.set_value
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DataFrame.set_value(index, col, value, takeable=False)[source]
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Put single value at passed column and index Deprecated since version 0.21.0: Use .at[] or .iat[] accessors instead. Parameters: - 
index : row label
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col : column label
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value : scalar value
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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/0.23.4/generated/pandas.DataFrame.set_value.html