code:

>>> from functools import reduce
>>> def arr_prod(arr):
...     prod_arr = []
...     for i in range(0, len(arr)):
...             if i == 0:
...                     val = reduce(lambda x, y: x * y, arr[i + 1:])
...             elif 0 < i < len(arr):
...                     val = reduce(lambda x, y: x * y, arr[:i] + arr[i + 1:])
...             else:
...                     val = reduce(lambda x, y: x * y, arr[:len(arr) - 1])
...             prod_arr.append(val)
...     return prod_arr
... 
>>> for thing in arr_prod([3,4,7,1]):
...     print(thing)
... 
28
21
12
84