Summary  
This chapter covers using the string method index() to locate the first occurrence of a substring and notes that it raises 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

A focused, beginner-friendly course on working with numbers in Python. Learn about integers, floats, arithmetic operations, type conversion, and how to avoid common pitfalls when handling numerical data.

Find the Word Index

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