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_3 , var_5 = 0 , 1
      for var_7 in range ( var_0 ) :
          var_3 , var_5 = var_5 , var_3 + var_5
      return var_3
  