A-24-魔法方法定制序列
#coding = UTF-8#编写一个不可改变的自定义列表，要求记录列表中每个元素被访问的次数
#用字典实现，每个key对应value值
class Mycountlist:
def __init__(self,*args):
self.values =
self.count = dict.fromkeys(range(len(self.values)),0)
def __getitem__(self,key):
self.values+=1
return self.values
def __len__(self):
return len(self.values)
#1.实现获取、设置和删除一个元素的行为（元素删除的同时对应的计数器也会被删除）
#2.增加counter(index)方法，返回index参数所指定的元素访问次数
#3.实现append()、pop()、remove()、clear()、insert()和reverse()方法
#注意计数器的对应改变
class CountList(list):
def __init__(self, *args):
super().__init__(args)
self.count = []
for i in args:
self.count.append(0)
def __len__(self):
return len(self.count)
def __getitem__(self, key):
self.count += 1
return super().__getitem__(key)
def __setitem__(self, key, value):
self.count += 1
super().__setitem__(key, value)
def __delitem__(self, key):
del self.count
super().__delitem__(key)
def counter(self, key):
return self.count
def append(self, value):
self.count.append(0)
super().append(value)
def pop(self, key=-1):
del self.count
return super().pop(key)
def remove(self, value):
key = super().index(value)
del self.count
super().remove(value)
def insert(self, key, value):
self.count.insert(key, 0)
super().insert(key, value)
def clear(self):
self.count.clear()
super().clear()
def reverse(self):
self.count.reverse()
super().reverse()
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