def find_substring(main_str, sub_str): if sub_str.lower() in main_str.lower(): return f"'{sub_str}' (ignoring case) found in '{main_str}'" else: return f"'{sub_str}' (ignoring case) not found in '{main_str}'" # 示例使用 main_string = "Hello, Python World!" sub_strin...
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…
在使用python编写代码时，有时会遇到字符串方法index()抛出ValueError: substring not found错误的情况。这提示我们试图查找的子串并未出现在目标字符串中。为避免程序因这个错误而中断，可以采用if判断语句或try...except语句来实现更健壮的错误处理。采用if判断语句，可以先检查子串是否存在于字符串中，避免...
ValueError: substring not found 还以为是代码出了问题,最后查阅文档: “Python index() rindex() 方法检测字符串中是否包含子字符串 str,如果指定 beg(开始) 和 end(结束) 范围,则检查是否包含在指定范围内,该方法与 python find()方法一样,只不过如果str不在 string中会报一个异常。” str.rindex(str, be...
Thefind()andindex()methods are used to find the first occurrence of a substring within a string. Both methods return the starting index of the substring if found, and -1 if the substring is not present. However, theindex()method raises aValueErrorexception if the substring is not found. ...
Python Code: # Function to find index of substring def find_Index(str1, pos): # Check if pos longer than str1 if len(pos) > len(str1): return 'Not found' # Iterate through str1 for i in range(len(str1)): # Iterate through pos ...
Note that find() function returns the index position of the substring if it’s found, otherwise it returns -1. count() functionto find the number of occurrences of a substring in the string. s = 'My Name is Pankaj' print('Substring count =', s.count('a')) ...
In the case the substring is not found in the string then it will raise the error which needs to be handled with the help of the try-exception statement. Syntax: In Python, the Index function, used on a string, is used to find the index of the character present in the string. It ...
foriinrange(len(actual_str) - len(pattern_str) + 1): ifpattern_str[0]==actual_str[i]and\ pattern_str[len(pattern_str)-1]==actual_str[i+len(pattern_str)-1]: indexes.append(i) iflen(indexes)==0: print'substring could not be found' ...
Check outConcatenate String and Float in Python Using the find() Method Another way to check if a string contains a substring in Python is by using thefind()method. It returns the index of the first occurrence of the substring within the string. If the substring is not found, it returns ...