Difference Between Find And Index In Python
distinguishing find() and index() in Python
Difference Between Find And Index In Python
In Python, both `find()` and `index()` methods are used to search for a specific substring within a string. The key difference between the two is how they handle scenarios where the substring is not found. The `find()` method returns -1 if the substring is not found, whereas the `index()` method raises a ValueError exception. Therefore, if you are unsure whether the substring is present in the string or not, it is recommended to use `find()` and check for -1 as the return value, while `index()` can be used if you are confident that the substring will always be found.
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1 - Usage:
`find()` method is used to find the first occurrence of a substring within a string. It returns the lowest index of the substring if found, otherwise returns 1.
`index()` method is used to find the first occurrence of a substring within a string, similar to `find()`. However, if the substring is not found, it raises a ValueError.
2) Return Value:
`find()` returns an integer representing the index of the found substring or 1 if not found.
`index()` returns the index of the found substring. If substring is not found, it raises a ValueError.
3) Error Handling:
`find()` does not raise any exception if the substring is not found; it simply returns 1.
`index()` raises a ValueError when the substring is not found.
4) Performance:
`index()` is marginally slower than `find()` due to the added functionality of raising an exception when the substring is not found.
5) Compatibility:
Both `find()` and `index()` methods are available in Python 2 and Python 3.
6) Use Case:
Use `find()` when you want a method that returns 1 if substring is not found.
Use `index()` when you prefer to handle the ‘substring not found’ condition explicitly using try except blocks.
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