For example, I could set a breakpoint ... Well, it turns out that Python offers a way to create an anonymous function using this lambda thing. In line 34, lambda a: not a.known() means we have a ...

Here’s a simple example: In this example ... The ‘type’ metaclass The built-in metaclass in Python is type. Surprisingly, type is not only a metaclass but also a class and a function!

Usually, inner scopes — for example functions within functions — would be able to see and change outer scopes. In Python, inner scopes can only see outer scopes, but not change them.

Example: Pyglet, a handy library for ... won’t work. Finally, Python apps that use ctypes may not always behave as expected. If you’re writing something that might run on both PyPy and CPython ...