def find_substring_in(s, sub):""" 使用in关键字查找子字符串 """if sub in s:return Trueelse:return False# 定义一个字符串string = 'A New String Hello, World!'sub_string = "Hello"print('例1，源字符串为：', string, ' 待查找字符串
在Python中,in操作符用于判断一个字符串是否包含某个子字符串。其使用方式为:substring in string,其中substring是要判断的子字符串,string是要搜索的字符串。 下面是一个简单的示例代码: string="Hello, World!"substring="World"ifsubstringinstring:print("Substring found!")else:print("Substring not found!")...
count() functionto find the number of occurrences of a substring in the string. s = 'My Name is Pankaj' print('Substring count =', s.count('a')) s = 'This Is The Best Theorem' print('Substring count =', s.count('Th')) Find all indexes of substring There is no built-in func...
substring="python"string="welcome to pythontip"print(substringinstring) 如果存在,则返回True,否则返回False。此处,输出为True。 如何检查子字符串是否存在-另一种方法 你也可以使用find()方法检查字符串中是否存在子字符串。 如下示例: substring="zz"string="hello world"print(string.find(substring)) 如果存在...
“He” in str “she” not in str string模块,还提供了很多方法,如 S.find(substring, [start [,end]]) #可指范围查找子串,返回索引值,否则返回-1 S.rfind(substring,[start [,end]]) #反向查找 S.index(substring,[start [,end]]) #同find,只是找不到产生ValueError异常 ...
substring in string2 (4)索引(Indexing) 使用方括号和索引可以获取字符串中特定位置的字符。索引从 0 开始。 char_at_index_2 = string1[2] # 结果为 'l' (5)切片(Slicing) 使用方括号和切片语法可以获取字符串的子串。 substring = string1[0:5] # 结果为 'Hello' ...
The index method can’t return a number because the substring isn’t there, so we get a value error instead: In order to avoid thisTraceback Error, we can use the keywordinto check if a substring is contained in a string. In the case of Loops, it was used for iteration, whereas in...
Python 字符串直接在方括号([])中使用索引即可获取对应的字符,其基本语法格式为:string[index] 这里的 string 表示要截取的字符串,index 表示索引值。 【例1】s = 'crazyit.org is very good' # 获取s中索引2处的字符 print(s[2]) # 输出a
下面是使用contains方法的示例代码: ```python string = "Hello, world!" substring = "world" if substring in string: print("Substring is present in the string.") else: print("Substring is not present in the string.") ``` 输出结果是:"Substring is present in the string."©...
substring2 =string[:-3] print(substring2) # Print"The quick brown " 获取字符串中的一个字符 这个很简单,如果切片中没有:字符,只包含数字,它将返回该索引处的字符。 例子: string='0123456789' substring =string[4] print(substring) # Print "4" ...