pandas.Index.is_monotonic_decreasing
- 
Index.is_monotonic_decreasing - 
Return if the index is monotonic decreasing (only equal or decreasing) values.
Examples
>>> Index([3, 2, 1]).is_monotonic_decreasing True >>> Index([3, 2, 2]).is_monotonic_decreasing True >>> Index([3, 1, 2]).is_monotonic_decreasing False
 
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    https://pandas.pydata.org/pandas-docs/version/0.24.2/reference/api/pandas.Index.is_monotonic_decreasing.html