def STD_DEV_SAMP(*expression):
return {'<STR_LIT>': list(expression)} if len(expression) > <NUM_LIT:1> else {'<STR_LIT>': expression[<NUM_LIT:0>]} if expression else {}<EOL>
Calculates the sample standard deviation of the input values.
Use if the values encompass a sample of a population of data from which to generalize about the population.
See https://docs.mongodb.com/manual/reference/operator/aggregation/stdDevSamp/
for more details
:param expression: expression/expressions
:return: Aggregation operator