PyTest is a mature, feature-rich Python testing framework that makes writing tests simple and scalable.

Key differences from unittest:

• Simpler syntax: Uses plain assert statements vs self.assertEqual()
• Automatic test discovery: No need for test suites
• Rich plugin ecosystem: Extensive third-party support
• Fixtures: Powerful dependency injection system
• Parametrized testing: Built-in multiple input support
• Better error reporting: More detailed failure messages

# PyTest style
def test_addition():
    assert 2 + 2 == 4

# unittest style
import unittest
class TestMath(unittest.TestCase):
    def test_addition(self):
        self.assertEqual(2 + 2, 4)