deffind_index(lst,target):forindex,iteminenumerate(lst):ifitem==target:returnindexreturn-1fruits=['apple','banana','orange','grape']index=find_index(fruits,'orange')print(f"Index of 'orange':{index}") 1. 2. 3. 4. 5. 6. 7. 8. 9. 运行以上代码,将输出如下结果: Index of 'orange...
Theindex()method is used to find the index of the first occurrence of a specified element in a list. This method is particularly useful when you need to know the position of a specific element within a list. Here’s an example of how to use theindex()method to find the index of the...
In this last example, we will use the index() method to get the search string in the list:try: my_list.index(search_string) print(True) except ValueError: print(False) # TrueThis example attempts to find the index of search_string within my_list using the index() method. The try ...
通过索引获取当前元素,并删除 del list1[2] # IndexError: list assignment index out of range # 使用下标查找数据时,下标索引不能不存在 # del list1[9] print(list1) # [1, 2, 4] # 如果要是循环中能够删除么? # 此处并没有删除,因为i是临时变量,我们使用del是在讲i和2的引用关系删除,但是list...
blog_titles=soup.findAll('h2',attrs={"class":"blog-card__content-title"})fortitleinblog_titles:print(title.text)# Output:# Prints all blog tiles on the page BeautifulSoup还可以轻松使用CSSselectors。如果开发人员知道CSS selector,则无需学习find()或find_all()方法。以下是相同的示例,但使用的是...
python: find the index of a given value in a list ["foo","bar","baz"].index("bar")
# for循环和while循环将打印 my_list 中的所有元素 for item in my_list: print(item) # while 循环 i = 0 while i < len(my_list): print(my_list[i]) i += 1 注意事项 列表操作可能改变列表本身而非返回新列表。 避免频繁修改列表结构可能导致性能问题。 方法语法 列表对象的所有方法: list.append...
*Numbers(数字)*String(字符串)*List(列表)*Tuple(元组)*Dictionary(字典) 三、 Python数字(Number) Python数字类型用于存储数值数值类型是不允许改变的,这就意味着如果改变数字类型的值,将重新分配内存空间 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ...
foreach (string str in lists) { Console.WriteLine("Result: ---FindAll--- " + str + " ---"); } Console.WriteLine("Result: ---FindLast--- " + strlist.FindLast(FindValues) + " ---"); Console.WriteLine("Result: ---FindLastIndex-- " + strlist.FindLastIndex(FindValues) +...
Get Next Element in List in Python Get Index of Item in 2D List in Python Find Index of List Element Conditionally in Python Print Shortest & Longest String in List in Python Python OverviewThis post has shown how to get the first index of a list in Python. If you have further ...