comefrom: <qiyuangong>231_Power_of_Two_1.py
code: def isPowerOfTwo( n):
      if n < 0:
          return False
      bin_str = bin(n)
      return sum(map(lambda x: int(x), list(bin_str[2:]))) == 1
masked: def sample_funcname ( var_0 ) :
      if var_0 < 0 :
          return False
      var_4 = bin ( var_0 )
      return sum ( map ( lambda var_7 : int ( var_7 ) , list ( var_4 [ 2 : ] ) ) ) == 1
  