In Python, finding the first occurrence is the process of locating the first occurrence of a substring within a given or specified larger string. This is often necessary for “data analysis” and “web scraping”, as well as other applications. Python provides several ways to find the first ...
Thefind()method returns the index of first occurrence of the substring (if found). If not found, it returns-1. Example message ='Python is a fun programming language' # check the index of 'fun'print(message.find('fun')) # Output: 12 Run Code find() Syntax The syntax of thefind()me...
find('AM') Python Copy returns 4 as the first occurrence of “AM” is at 4. rfind The rfind function returns the last occurrence of the substring if found, -1 if not found. s = "MY NAME IS MARK" s.rfind("A") Python Copy returns 12 as the last occurrence of “A” is the ...
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. He...
There is another method in the string type called find which is more convenient to use than the index(), because there is no need to worry about handling any exceptions. Its function is to return the index of the first occurrence of substring which is found in the string. ...
The last occurrence of 'o' is at index 8 1. 上述代码中,我们定义了一个字符串input_str,并将要查找的字符赋值给search_str。然后使用rfind()方法查找字符串中最后一次出现的字符'o',并将结果赋值给index。最后,使用print()函数输出结果。 3. 应用场景 ...
print('\'spring\' location -> {}'.format(s.find('spring'))) 'string' location -> 10 'spring' location -> -1 find()returns the index of the first character of the first occurrence of the substring by default, and returns-1if the substring is not found. Check the documentation for...
= None and substring in fullstring: print("Found!") else: print("Not found!") The String.index() Method The String type in Python has a method called index() that can be used to find the starting index of the first occurrence of a substring in a string. If the substring is not...
The re.search() function takes the pattern and the input string as arguments and searches for the first occurrence of the pattern in the string. In this case, it will find the digit '1' at the beginning of the string. Since a match is found, the function returns a match object contain...
The index of word ‘method’: 21 You saw that the source string contains the word ‘method’ twice and the find method returned the index of the first occurrence. An example if a substring does not exist See the return value if the given search substring is not found in the source strin...