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/pandas 0.23

pandas.Series.is_monotonic_increasing

Series.is_monotonic_increasing

Return boolean if values in the object are monotonic_increasing

New in version 0.19.0.

Returns:
is_monotonic : boolean

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Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.23.4/generated/pandas.Series.is_monotonic_increasing.html