PyPy is a fast, compliant alternative implementation of Python.
 cPython is implemented in C.

 PyPy is implemented in Python.
 What does that mean?

 And how do you test something as huge as an alternative implementation of Python?

Special Guest: Carl Friedrich Bolz-Tereick.

Links:

• PyPy
• How is PyPy Tested? 
• PyPy Speed
• Python Speed Center

 Learn pytest

• pytest is the number one test framework for Python.
• Learn the basics super fast with Hello, pytest!
• Then later you can become a pytest expert with The Complete pytest Course
• Both courses are at courses.pythontest.com