comefrom: <doocs>0231.Power of Two_1.py
code: def isPowerOfTwo( n: int) -> bool:
      return n > 0 and (n & (n - 1)) == 0
masked: def sample_funcname ( var_0 : int ) -> bool :
      return var_0 > 0 and ( var_0 & ( var_0 - 1 ) ) == 0
  