2. list.index() – Multiple occurrences of element in the list When the element, whose index we are trying to find, occurs multiple times in the list,index()method returns the index of first match and ignores th
We can get the index of the first element in our list using the index() function.first_index = my_list.index('a') print(first_index) # 0As you can see, my_list.index('a') returns the index of the first element ‘a’ in my_list, which is 0....
可以看到,当索引在列表范围内时,get方法返回对应的元素值;当索引超出范围时,get方法返回None。 列表list的get方法流程图 下面是列表list的get方法的流程图示意图: Index in rangeIndex out of rangeStartGetElementReturnElementReturnNoneOutputElementOutputNoneEnd 总结 通过本文的介绍,我们了解了Python中列表list的get...
In general,append()is the most efficient method for adding a single element to the end of a list.extend()is suitable for adding multiple elements from an iterable.insert()is the least efficient due to the need to shift elements to make space for the new element. The+operator creates a n...
target_element=2 Example 1: Determine Index of All Matching Elements in List Using for Loop & enumerate() Function In this first example, we will use afor loopalong with theenumerate() functionto get the index of all the matching elements in the list: ...
Accessing Elements by Index The most straightforward way to retrieve an element from a list is by its index. In Python, list indexes start at 0, so the first element in a list has an index of 0, the second element has an index of 1, and so on. ...
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') ...
Python sort list by element index A Python list can have nested iterables. In such cases, we can choose the elements which should be sorted. sort_elem_idx.py #!/usr/bin/python vals = [(4, 0), (0, -2), (3, 5), (1, 1), (-1, 3)] ...
In Python, indexing refers to the process of accessing a specific element in a sequence, such as a string or list, using its position or index number. Indexing in Python starts at 0, which means that the first element in a sequence has an index of 0, the second element has an index ...
ellipsis-1 """ # 职位 title = div.find_element_by_css_selector('.job-title-box div.ellipsis-1').text # 城市 city = div.find_element_by_css_selector('.job-title-box span.ellipsis-1').text salary = div.find_element_by_css_selector('.job-salary').text # 列表推导式 info_list ...