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from agate.aggregations.percentiles import Percentiles
from agate.computations.rank import Rank
from agate.data_types import Number
from agate.exceptions import DataTypeError
class PercentileRank(Rank):
"""
Calculate the percentile into which each value falls.
See :class:`.Percentiles` for implementation details.
:param column_name:
The name of a column containing the :class:`.Number` values.
"""
def validate(self, table):
column = table.columns[self._column_name]
if not isinstance(column.data_type, Number):
raise DataTypeError('PercentileRank column must contain Number data.')
def run(self, table):
"""
:returns:
:class:`int`
"""
percentiles = Percentiles(self._column_name).run(table)
new_column = []
for row in table.rows:
new_column.append(percentiles.locate(row[self._column_name]))
return new_column
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