Finding the index of an item in a list: In this tutorial, we will learn how to find the index of a given item in a Python list. Learn with the help of examples.
1) Using index() MethodThe index() method is used to find the index value of the specific element.Syntax:list_name.index(item) It will print the index value of an item from the list_name.Example 1:# list list = ["Gwalior", "Bhopal", "Indore", "Noida", "Delhi", "Ajmer"] #...
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...
首先检查它item in my_list(干净,可读的方法),或 将index呼叫包裹在try/except捕获的块中ValueError(可能更快,至少当搜索列表很长时,该项通常存在。) 大多数答案解释了如何查找单个索引,但如果项目在列表中多次,则它们的方法不会返回多个索引。用途enumerate(): for i, j in enumerate(['foo', 'bar', 'baz...
In Python, list elements are arranged in sequence. We can access any element in the list using indexes. Python list index starts from 0. ADVERTISEMENT This article will discuss different methods to find the index of an item in the Python list. ...
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 ...
string.index(str, beg=0, end=len(string))跟find()方法一样,只不过如果str不在 string中会报一个异常. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 >>>mystr.index("how")12>>>mystr.index("how",20,30)Traceback(most recent call last):File"<stdin>",line1,in<module>ValueError:subst...
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#例子:target='www.163.com'print(target.find('163'))iftarget.find('263')==-1:print('263不存在于字符串'+target+'中') 运行: C:\Users\horn1\Desktop\python\7>python find.py4263不存在于字符串www.163.com中 当然,如果仅仅是字符串里是否存在子串的话,使用 in 和 not in 操作符更好。
#获取字所有的符串方法print(dir(str))[...,'capitalize','casefold','center','count','encode','endswith','expandtabs','find','format','format_map','index','isalnum','isalpha','isascii','isdecimal','isdigit','isidentifier','islower','isnumeric','isprintable','isspace','istitle','isupp...