Summary  
This chapter explains the string.index() method to find the first occurrence of a substring in a string—returning its index and raising an exception if the substring isn’t found.

General domain of usage  
text processing

Hi there, it should be mentioned that there is another function that does the same action as `find()`, which is called `index()`.

Like the very similar function `find()`, it finds the first appearance of the word. Look at the example to clarify its usage:

string = "I can manage everything"

manage = string.index('manage')
everything = string.index('everything')

print("The index of the word manage is", manage)
print("The index of the word everything is", everything)

As you may have recognized, the `index()` function has the following syntax:
```python
string.index('word')
```

import unittest
import sys
from io import StringIO


class TestUserCode(unittest.TestCase):
    def _test_variable_equals_string(self, var_name, expected):
        import user_code
        if not hasattr(user_code, var_name):
            return (False, f"Expected '{var_name}' variable to be defined.")
        var = getattr(user_code, var_name)
        if var != expected:
            return (False, f"Expected '{var_name}' to equal '{expected}', but got '{var}'.")
        return (True, f'The variable {var_name} equals "{expected}"')

    def test_burning(self):
        passed, result_text = self._test_variable_equals_string(
            'burning', 21)
        self._testMethodName = result_text
        self.assertTrue(passed, result_text)

    def test_desire(self):
        passed, result_text = self._test_variable_equals_string(
            'desire', 29)
        self._testMethodName = result_text
        self.assertTrue(passed, result_text)

    def test_studying(self):
        passed, result_text = self._test_variable_equals_string(
            'studying', 40)
        self._testMethodName = result_text
        self.assertTrue(passed, result_text)


if __name__ == '__main__':
    unittest.main()


test_main.py

This course is going to help you dive deeper into data types and try to work with them. Here you will learn basic operations and all ins and outs of numbers, boolean data type, and strings. This course consists of a lot of practical tasks after which you will become a skillful programmer.

Numeric data types are crucial in Python, so it is important to start with them. Here you will work with simple math operations and find out the purposes of learning different types of numerical data.

Mastering boolean data types and logical operations in Python. You'll learn how to work with True and False, apply logical operators like and, or, and not, and understand how operator precedence works in complex expressions.

Strings are an essential part of Python programming, allowing you to work with text data. In this section, you'll learn how to manipulate strings, extract characters, slice words, and search for specific phrases.

This chapter consists of practical tasks that combine all the examined topics together with a bit of theory.

Find the Word Index

Solution

Awesome!

Find the Word Index

Solution

Awesome!