Everything in Python is an object, or so the saying goes. If you want to create your own custom objects, with their own properties and methods, you use Python’s class object to make that happen.

In Python, the mere act of making a function call incurs a relatively large amount of overhead. If some function is called repeatedly in a tight loop, even if it isn’t a long-running function ...

return bar b = foo(10) print(b(2)) Generators With all this talk of callables, you also should consider what happens with generator functions. Python loves iteration and encourages you to use for ...