def POW(number, exponent):
return {'<STR_LIT>': [number, exponent]}<EOL>
Raises a number to the specified exponent and returns the result.
See https://docs.mongodb.com/manual/reference/operator/aggregation/pow/
for more details
:param number: The number or field that will be raised
:param exponent: The number or field that will be the exponent
:return: Aggregation operator