Basically, we just get the length of the list and subtract that length by one. That gives us the index of the last item in the list. The main drawback with a solution like this is the time complexity. In order to access the last element, we have to compute some expression which ...
方法 1：使用 pop() 方法删除列表中最后一个元素的最简单的方法是使用 pop()。此方法删除并返回给定索引处的元素。如果未指定索引，它将删除并返回列表中的最后一个元素。lst = [1, 2, 3, 4, 5, 6]last_item = lst.pop()print("最后一个元素：", last_item)print("更新后的列表：", lst)方法 2...
last_item = inventory.pop()# 'scroll'inventory.pop(1)# 'longbow'• del关键字：直接通过索引或切片删除元素，如同撕下日志中的某一页。del inventory[]# ['longbow']del inventory[:]# 清空整个列表 2.3 遍历列表 for循环遍历 遍历列表就如同逐页翻阅探险日志，细细品味每一次冒险经历。使用Python的for...
Calling .pop() without arguments removes and returns the last item in the list: Python >>> a = ["a", "b", "c", "d", "e"] >>> a.pop() 'e' >>> a ['a', 'b', 'c', 'd'] >>> a.pop() 'd' >>> a ['a', 'b', 'c'] If you specify the optional index ...
Pop:返回最后一个元素,并从list中删除它。 代码语言:javascript 复制 >>>a['python','ab',2,3,4]>>>del a[0]>>>a['ab',2,3,4]>>>a.remove(2)#删除的是给定的value>>>a['ab',3,4]>>>a.remove(2)#如果没找到的话,会抛异常。Traceback(most recent call last):File"<stdin>",line1,...
Write a Python program to find the last occurrence of a specified item in a given list. Pictorial Presentation: Sample Solution: Python Code: # Define a function called 'last_occurrence' that finds the last occurrence of a character 'ch' in a list of characters 'l1'.deflast_occurrence(l1...
3. Iterate a list 我们可以使用来遍历列表项for loop。 charList = ["a", "b", "c"] for x in charList: print(x) # a # b # c 4. Check if a item exists in the list 使用'in'关键字确定列表中是否存在指定的项目。 charList = ["a", "b", "c"] ...
Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: 'a' is not in list >>> a.index('a', 1, 4) 3 >>> a.count('b') 2 >>> a.count('d') 0 1. 2. 3. 4. 5. 6. 7. 8. 9.
charList.pop() # removes 'd' - last item print (charList) # ['a', 'b', 'c'] charList.pop(1) # removes 'b' print (charList) # ['a', 'c'] 7.3. clear() 它清空列表。 charList = ["a", "b", "c", "d"] charList.clear() ...
ExampleGet your own Python Server Print the second item of the list: thislist = ["apple", "banana", "cherry"] print(thislist[1]) Try it Yourself » Negative IndexingNegative indexing means beginning from the end, -1 refers to the last item, -2 refers to the second last item etc...