1 method1 全列表查询元素位置列表元素位置查找最基础的方式就是全列表查询，在python中使用index可对列表进行对应的操作，指定查找的元素内容即可。但注意返回的是查找到的首个元素索引指令形式index = namelist.index(索引内容)2 method2 指定列表起始位置查询元素位置除了全列表查询我们还可以指定列表的起始位置查询，...
除了线性查找外,Python还提供了列表的index()方法来查找特定元素的位置。index()方法会返回列表中第一个匹配元素的索引值,如果没有找到,则会抛出ValueError异常。 # 使用index()方法查找元素位置arr=[1,2,3,4,5]target=3try:idx=arr.index(target)print(idx)# 输出:2exceptValueError:print("元素不存在") 1....
In this tutorial, we will learn about the Python List index() method with the help of examples. Theindex()method returns the index of the specified element in the list. Example animals = ['cat','dog','rabbit','horse'] # get the index of 'dog' index = animals.index('dog') print(...
Python List pop() Python List Python String rindex() Python List index()The index() method returns the index of the specified element in the list. Example animals = ['cat', 'dog', 'rabbit', 'horse'] # get the index of 'dog' index = animals.index('dog') print(index) # Outp...
Remove the item at the given position in the list, and return it. If no index is specified,a.pop()removes and returns the last item in the list. (The square brackets around theiin the method signature denote that the parameter is optional, not that you should type square brackets at th...
importtimeit# 测试方法一:使用enumerate()函数deftest_method1():input_list=[iforiinrange(10000)]sorted_index=sort_list_with_index(input_list)# 测试方法二:使用zip()函数和sorted()函数deftest_method2():input_list=[iforiinrange(10000)]sorted ...
Python Index Examples The method index() returns the lowest index in the list where the element searched for appears. If any element which is not present is searched, it returns a ValueError. Lets try this: list_numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] element = 3 list_num...
Python has a set of built-in methods that you can use on lists.MethodDescription append() Adds an element at the end of the list clear() Removes all the elements from the list copy() Returns a copy of the list count() Returns the number of elements with the specified value extend()...
| Data and other attributes defined here: | | 34.__hash__ = None | | 35.__new__ = <built-in method __new__ of type object> | T.__new__(S, ...) -> a new object with type S, a subtype of T
Theindex()method returns the index of the first matching item in a list (if the item is present): Python groupMembers.index('Quinn') The output is: Output 2 Thecount()method returns the number of items in a list that match objects that you pass in: ...