Finding the index of the string in the text file using readline() In this method, we are using the readline() function, and checking with the find() function, this method returns -1 if the value is not found and if found it returns 0.
By using python I need to know how to find a substring in a text file.
I tried using in and not in function in python to find a substring from a text file but i am not clear about it
How to find a substring in a text file using python?