在这段代码中,我们定义了一个名为index_of_substring的函数,它接受两个参数:string和substring,分别表示待查找的字符串和子字符串。在函数体内,我们按照之前的步骤实现了查找子字符串的功能,并最终返回子字符串的位置。 结尾 通过以上的步骤和代码示例,我们可以实现在Python中查找子字符串的功能。希望本文能够帮助到刚...
deffind_substrings(string,substrings):positions=[]forsubstringinsubstrings:index=string.find(substring)positions.append(index)returnpositions# 示例用法string="This is a test string."substrings=["is","test","string"]positions=find_substrings(string,substrings)print(positions)# 输出:[2, 10, 17] ...
File "<string>", line 6, in result = sentence.index('Java') ValueError: substring not found Note:Index in Python starts from0and not1. So the occurrence is19and not20. Example 2: index() With start and end Arguments sentence ='Python programming is fun.'# Substring is searched in '...
substring : 用去提取字符串介于两个指定下标之间的字符 stringObject.substring(start,stop) start 必需。一个非负的整数,规定要提取的子串的第一个字符在 stringObject 中的位置。 stop 可选。一个非负的整数,比要提取的子串的最后一个字符在 stringObject 中的位置多 1。如果省略该参数,那么返回的子串会一直到...
When slicing strings, we are creating asubstring, which is essentially a string that exists within another string. When we callss[6:11], we are calling the substringSharkthat exists within the stringSammy Shark!. If we want to include either end of a string, we can omit one of the numb...
ValueError: substring not found在python的编程过程中,若是使用字符串内置的方法index()来查找子串第一次出现的索引位置时,python抛出ValueError,并提示substring not found,那么意思就是子串不在调用对象之…
python my_string = "Hello, world!"substring = "world"if substring in my_string:index = my_string.index(substring)print(f"子串'{substring}'在索引位置{index}首次出现。")else:print(f"子串'{substring}'不在字符串'{my_string}'中。")通过if语句判断子串是否存在，不存在时会输出相应的...
Write a Python program to determine the index of a given string at which a certain substring starts. If the substring is not found in the given string return 'Not found'. Sample Solution: Python Code: # Function to find index of substring ...
= my_string.index('world') print(f"The index of 'world' is: {index_of_world}") # 输出: The index of 'world' is: 7 # 如果子字符串不在字符串中,会抛出 ValueError 异常 try: index_of_python = my_string.index('python') except ValueError: print("Substring not found in the string"...
print(e) # 输出: substring not found 在Java中 在Java中,indexOf方法是List接口的一部分,它返回指定元素在列表中的第一个索引,如果不存在则返回-1。 import java.util.ArrayList; import java.util.List; public class Main { public static void main(String[] args) { ...