RECURSIONS

Question

can someone please explain this particular code in a less advanced way for me, especially this one ---------> return list[0]**2 + calc(list[1:])

def calc(list):
if len(list)==0:
return 0
else:
return list[0]**2 + calc(list[1:])

list = [1, 3, 4, 2, 5]
x = calc(list)
print(x)

Answer 1

list[0]**2 + calc(list[1:])

Calculating list[0] power 2 + (again calling function remaining list with [3, 4,2,5] so now list[0] for new function is 3
Finally returning like

1**2 + ( 3**2 + ( 4**2 + (2**2 + (5**2 +( 0 ) ))))
= 1 + (9 + ( 16 + ( 4 + ( 25 + 0) ) ) ) = 55