fibonacci
# Easy fibonacci exercise # Method #1 def fibonacci(n): # 1th: 0 # 2th: 1 # 3th: 1 ... if n == 1: return 0 elif n == 2: return 1 else: return fibonacci(n - 1) + fibonacci(n - 2) # Method #2 def fibonacci2(n): if n == 0: return 0 n1 = 1 n2 = 1 # (1, n - 2) because start by 1, 2, 3... not 0, 1, 1, 2, 3.... for i in range(1, n - 2): n1 += n2 n2 = n1 - n2 return n1 print(fibonacci(13)) # return the nth element in the fibonacci sequence
