comefrom: <doocs>0509.Fibonacci Number_1.py
code: def fib( n: int) -> int:
      a, b = 0, 1
      for _ in range(n):
          a, b = b, a + b
      return a
masked: def sample_funcname ( var_0 : int ) -> int :
      var_1 , var_2 = 0 , 1
      for var_3 in range ( var_0 ) :
          var_1 , var_2 = var_2 , var_1 + var_2
      return var_1
  