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python string index itsmycode skip to content itsmycode home courses full stack web development front end web development ux ui immersive course digital marketing corporate training faqs blog contact us python string index october 19 2024 categories python string methods the python string index method is a built in function that returns the substring s lowest index first occurrence in a given string if not found it raises valueerror substring not found exception in this article we will learn about the python string index method with the help of examples index syntax the syntax of index method is str index sub start end index parameters the index method can take three parameters sub substring that needs to be searched in the given string start optional starting position where the substring needs to be searched within the string end optional ending position where the substring needs to be searched within the string note if the start and end indexes are not provided by default it takes 0 as the starting index and str length 1 as the end index index return value the index method returns an integer value an index of a substring if the substring is found in the given string the index method will return the index of the first occurrence of the substring if the substring is not found in the given string it throws valueerror substring not found exception difference between index method and find method the index method is similar to find method the only major difference is that the find method returns 1 if the substring is not found in a given string whereas the index method will raise the valueerror substring not found exception example 1 find the index of a string in python the index in python starts from 0 and not from 1 hence in the below example the first occurence of the substring code is found at index position 5 text itsmycode learn how to code in python find the index of first occurence of substring output text index code print the index of first occurrence of code is output find the index of character output text index print the index of first occurrence of is output output the index of first occurrence of code is 5 the index of first occurrence of is 10 example 2 if string is not found valueerror substring not found exception here the substring hello is not found in the given string and hence python interpreter raises valueerror substring not found exception text itsmycode learn how to code in python find the index of first occurence of substring output text index hello print the index of first occurrence of hello is output output traceback most recent call last file c personal ijs code main py line 4 in module output text index hello valueerror substring not found example 3 python string index using start and end arguments text itsmycode learn how to code in python find the index of first occurence of substring code output text index code 18 print the index of first occurrence of hello is output find the index of character output text index 8 12 print the index of first occurrence of is output find the index of substring to output text index to 18 6 print the index of first occurrence of to is output output the index of first occurrence of hello is 25 the index of first occurrence of is 10 the index of first occurrence of to is 22 related posts python string rindex python string rfind how to check if string contains substring in python python list index python typeerror str object is not callable solution python valueerror could not convert string to float search search popular post what it s like to be black in tech who learns to code part time at itsmycode what is conversational ux categories basics built in methods business c c career clojure date and time django erlang errors and exception files and folders git haskell health how to java javascript leadership list methods node js numpy pandas powershell python r ruby on rails rust scipy seaborn sitecore start up string methods technology tutorials ui ux design itsmycode start your career with premier training in programming software development web development ux ui digital marketing and more apply today quick links homepage job support careers blog about us contact us privacy policy cookie policy programs digital marketing course ux ui immersive course full stack web development course front end web development course corporate training contact us monday friday 8 00 a m 5 00 p m admin itsmycode com 2026 itsmycode all rights reserved