理解prod agg in Python

• prod

  numpy.prod(a, axis=None, dtype=None, out=None, keepdims=)
  

  Params	type	mean
  a	array_like	input data
  axis	None or int or tuple of ints, its optional	It’s the Axis along which a product is performed.
  dtype	dtype	type of the returned array
  out	nadarray	Alternative output array in chich to place the result
  keepdims	bool

  numpy.prod() returns the product of array elements over a given axis.