comefrom: <qiyuangong>367_Valid_Perfect_Square_1.py
code: def isPerfectSquare( num):
      i = 1
      while num > 0:
          num -= i
          i += 2
      return num == 0
masked: def sample_funcname ( var_0 ) :
      var_2 = 1
      while var_0 > 0 :
          var_0 -= var_2
          var_2 += 2
      return var_0 == 0
  