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- #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 = [x for x in args]
- self.count = dict.fromkeys(range(len(self.values)),0)
-
- def __getitem__(self,key):
- self.values[key]+=1
- return self.values[key]
-
- 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[key] += 1
- return super().__getitem__(key)
- def __setitem__(self, key, value):
- self.count[key] += 1
- super().__setitem__(key, value)
- def __delitem__(self, key):
- del self.count[key]
- super().__delitem__(key)
- def counter(self, key):
- return self.count[key]
- def append(self, value):
- self.count.append(0)
- super().append(value)
- def pop(self, key=-1):
- del self.count[key]
- return super().pop(key)
- def remove(self, value):
- key = super().index(value)
- del self.count[key]
- 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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