comefrom: <qiyuangong>367_Valid_Perfect_Square_3.py
code: def isPerfectSquare( num):
      x = num
      while x * x > num:
          x = (x + num / x) / 2
      return x * x == num
masked: def sample_funcname ( var_0 ) :
      var_1 = var_0
      while var_1 * var_1 > var_0 :
          var_1 = ( var_1 + var_0 / var_1 ) / 2
      return var_1 * var_1 == var_0
  