The percentile rank of a score relative to a list of scores.
A percentileofscore of, for example, 80% means that 80% of the scores in a are below the given score. In the case of gaps or ties, the exact definition depends on the optional keyword, kind.
Parameters:  a: array like :
score: int or float :
kind: {‘rank’, ‘weak’, ‘strict’, ‘mean’}, optional :


Returns:  pcos : float

Examples
Threequarters of the given values lie below a given score:
>>> percentileofscore([1, 2, 3, 4], 3)
75.0
With multiple matches, note how the scores of the two matches, 0.6 and 0.8 respectively, are averaged:
>>> percentileofscore([1, 2, 3, 3, 4], 3)
70.0
Only 2/5 values are strictly less than 3:
>>> percentileofscore([1, 2, 3, 3, 4], 3, kind='strict')
40.0
But 4/5 values are less than or equal to 3:
>>> percentileofscore([1, 2, 3, 3, 4], 3, kind='weak')
80.0
The average between the weak and the strict scores is
>>> percentileofscore([1, 2, 3, 3, 4], 3, kind='mean')
60.0