# 
## Overview

Python provides the following two built-in methods to find the first occurrence of a given substring in a string: 

- **`find()`**

- **`index()`**

Both methods have the same syntax. However, in the case where the required substring is *not* found in the target string, there is a significant difference in the output of both these methods:

- `find()` returns -1.

- `index()` raises an exception.

## `find()`

### Syntax
```
string_name.find(str, start, end)
```
### Code sample





string = 'Educative shot'

  
# starts search at index 1 and ends at index 7
print(string.find('ca ', 1, 7)) 

> Note: In the code above, the substring `ca ` has a space after the character `a`. That's why the method `find()` returns -1.

## `index()` 

### Syntax
```
string_name.find(str, start, end)
```

### Code sample


txt = "Hello, welcome to Educative."
# Substring to be search
x = txt.index("b")
# display the position
print(x)

> Note: In the code above, a `ValueError` is raised since substring `b` is not found in the string.

What is the difference between String find() and index() method?

find() returns -1 if the substring is not found, while index() raises a ValueError.