- Series.has_validity() bool #
Return True if the Series has a validity bitmask.
If there is no mask, it means that there are no
While the absence of a validity bitmask guarantees that a Series does not have
nullvalues, the converse is not true, eg: the presence of a bitmask does not mean that there are null values, as every value of the bitmask could be
To confirm that a column has