Python - String Method - index() Tutorial

It will return the index of the first occurrence of the specified value in the given string. If not found it will raise an exception. It is similar to find(), the only difference is find() method will return -1 if the specified value is not found.

Syntax-

String.index(value, start, end)

#value - It is a specified value that
 needs to be searched in the given String.
#start - (Optional) It is a position to start
 the search, by default, it is 0
#end   - (Optional) It is a position to end search, 
by default is the end of the string

Example-  

str1 = "Hello Welcome to python Tutorial"
print(str1.index("python"))
print(str1.index("to",10,30))
print(str1.index("to",10,13))
print(str1.index("Python"))#case sensitive

Output-

17
14
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
~\AppData\Local\Temp/ipykernel_6136/1803055335.py in <module>
      2 print(str1.index("python"))
      3 print(str1.index("to",10,30))
----> 4 print(str1.index("to",10,13))
      5 print(str1.index("Python"))#case sensitive

ValueError: substring not found