Series.str.islower()
pandas.Series.str.islower
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Series.str.islower()
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Check whether all characters in each string in the Series/Index are lowercase. Equivalent to
str.islower()
.Returns: is : Series/array of boolean values
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Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.Series.str.islower.html