How to Use Pytest for Debugging Your Python Apps

Debugging your Python apps with Pytest can make solving problems easier. Here are some simple ways to use Pytest for debugging.

1. Use Assertions Carefully

Assertions help check if your code works like it should. Instead of just saying something like assert x == 5, you can add helpful messages to find problems more easily:

def test_addition():
    x = add(2, 3)
    assert x == 5, f"Expected 5, but got {x}"

2. Use the --pdb Option

If a test fails, you can enter the Python debugger by using the --pdb option with Pytest:

pytest --pdb

This lets you look at your variables and see what’s happening right where the test failed.

3. Use Fixtures for Preparation

Fixtures help set up what you need for your tests. They make sure that every test starts the same way, which helps you spot problems:

import pytest

@pytest.fixture
def sample_data():
    return [1, 2, 3]

def test_data_processing(sample_data):
    assert process_data(sample_data) == expected_result

4. Run Specific Tests

You can choose to run only certain tests or test files. This makes it easier to find where the issues are:

pytest tests/test_file.py

By using these tips, you can successfully debug your Python applications with Pytest. This will help you develop faster and write stronger code!