Answer to Question #103970 in Python for nagaratna

Question

def mystery(l,v):
if len(l) == 0:
return (v)
else:
return (mystery(l[:-1],l[-1]+v))
What does mystery([22,14,19,65,82,55],1) return?

Answer 1

program code:

def mystery(l,v):

  if len(l) == 0:

    return (v)

  else:

    return (mystery(l[:-1],l[-1]+v))

   

print(mystery([22,14,19,65,82,55],1))

__________________________________

The mystery (l, v) function is recursive.

 Adds the last item to the list and removes it from the list.

The function works until the list is empty.

The function returns a value equal to the sum of:

1+55+82+65+19+14+22 = 258

Step by step function execution:

[22, 14, 19, 65, 82, 55] 1 (The initial value of the amount is set to 1)

[22, 14, 19, 65, 82] 56

[22, 14, 19, 65] 138

[22, 14, 19] 203

[22, 14] 222

[22] 236

[ ] 258 (The list is empty).

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The function will return the number 258.