魔术方法

Python还提供了比较的神奇方法。
__lt__ 为 <
__le__ 为 <=
__eq__ 为 ==
__ne__ 为 !=
__gt__ 为 >
__ge__ 为 >=

class SpecialString:
  def __init__(self, cont):
    self.cont = cont

  def __gt__(self, other):
    for index in range(len(other.cont)+1):
      result = other.cont[:index] + ">" + self.cont
      result += ">" + other.cont[index:]
      print(result)

spam = SpecialString("spam")
eggs = SpecialString("eggs")
spam > eggs

结果：

>>>
>spam>eggs
e>spam>ggs
eg>spam>gs
egg>spam>s
eggs>spam>
>>>