deque:popleft是其独有,但它的pop不能从指定的位置删 list:list/dict都可以从指定位置删,list简单直接给pop(index)即可 set:set其实有pop,但它既不能指定,且没有所谓最后一个,也是随机,其他得用remove或者discard(区别在于如果元素不存在,前者会报错而后者不会) dict: 根据官网来看,dict的复杂度平均是O(1),最...
[2] = Popping the intermediate element at indexkfrom a list of sizenshifts all elementsafterkby one slot to the left using memmove.n - kelements have to be moved, so the operation isO(n - k). The best case is popping the second to last element, which necessitates one move, the wo...
The order in which you specify the elements when you define a list is an innate characteristic of that list and is maintained for that list’s lifetime. (You will see a Python data type that is not ordered in the next tutorial on dictionaries.)...
To remove duplicates from a Python list while preserving order, create a dictionary from the list and then extract its keys as a new list: list(dict.fromkeys(my_list)).
# 重构前的“坏味道”代码片段defprocess_orders(order_list):total=0fororderinorder_list:total+=order['amount']payment_system.process_payment(order)shipping_service.ship_products(order)notification_service.send_confirmation(order)returntotal# 重构后,识别并拆分职责defcalculate_total(order_list):returnsum...
classSolution:defmoveZeroes(self,nums:List[int])->None:""" Do notreturnanything,modify numsin-place instead.""" # 因为删除元素会改变数组,这里采用while循环来控制遍历 i=0# count 用来记录检测到0的个数,也用来控制while的过程 count=0# 当删除0时,数组的坐标会前移,最末位坐标为原坐标减去已检测0...
其次还有其他坏味道:过长函数 (Long Method)、过大的类 (Large Class)、过长参数列表 (Long Parameter List)、冗余类(Lazy Class)、冗余函数(Lazy Function)无用函数参数(Unused Function Parameter)、函数圈复杂度超过 10(The Complexity is over 10)、依恋情结(Feature Envy)、Switch 过多使用(Switch Abuse)、...
class FakeRepository(AbstractRepository): def __init__(self, batches): self._batches = set(batches) def add(self, batch): self._batches.add(batch) def get(self, reference): return next(b for b in self._batches if b.reference == reference) def list(self): return list(self._batches...
根据目标元素所在位置的索引进行删除,可以使用del关键字或者pop()方法; 根据元素本身的值进行删除,可使用列表(list类型)提供的remove()方法; 将列表中所有元素全部删除,可使用列表(list类型)提供的clear()方法。 1. del() del是Python中的关键字,专门用来执行删除操作,它不仅可以删除整个列表,还可以删除列表中的某...
next return string + 'end' 调用链表 if __name__ == '__main__': a = LinkList() a.insert(0, 0) a.insert(1, 1) a.insert(2, 2) a.insert(3, 3) print(a) a.remove(1) a.remove(3) print(a) a.reserve() print(a) 栈(stack) 属于先进后出,先放进的数据在最下,新数据压...