A protocol is a way to define structural typing or "duck typing" in Python. It defines a set of attributes and/or methods that an object must have in order to be considered compatible with that protocol. Below is a protocol defined as an Activity class which must have name and duration attributes along with a get_message method.
from typing import Protocol
class Activity(Protocol):
name: str
duration: int
def get_message(self, x: str) -> str: ...
Below is a ShellActivity class that conforms to the Activity protocol because it has name and duration attributes and a get_message method.
class ShellActivity:
name: str
age: int
duration: int
def get_message(self, x: str):
return f"hello {x}"
# Create an instance of a ShellActivity object
shell: Activity = ShellActivity()
