mystery 2

main.py

def mystery2(lst, n):
  if n == 0:
    return lst
  elif lst == []:
    return lst
  else:
    a = mystery2(lst[1:], n-1)
    b = a[0:n-1]
    c = a[n-1:]
    return b + [lst[0]] + c

ans = mystery2([1,3,4,7,9], 3)

# 3. What does mystery([1,3,4,7,9], 3) return?

# 4. How many times is mystery2 called during 
#    the execution of mystery2([1,3,4,7,9], 3), 
#    including the first call to mystery2?