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/pandas 0.22

pandas.Series.str.swapcase

Series.str.swapcase() [source]

Convert strings in the Series/Index to be swapcased. Equivalent to str.swapcase().

Returns: converted : Series/Index of objects

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http://pandas.pydata.org/pandas-docs/version/0.22.0/generated/pandas.Series.str.swapcase.html