Lesson 3: Two Dogs - Your First Class

Two Dogs Build two objects from one blueprint.

1class Dog:

2 def __init__(self, name):

3 self.name = name

5rex = Dog("Rex")

6bella = Dog("Bella")

7print(rex.name)

8print(bella.name)

Terminal

$ python3 main.py

Rex

Bella

Every line, explained

class Dog:: class Dog: defines a class: a blueprint describing what every Dog can do. Like if and def, the line ends with a colon and everything belonging to the class is indented underneath.
def __init__(self, name):: The __init__ method (two underscores each side, "dunder init") is special: Python runs it AUTOMATICALLY whenever a new object is built. It is where you fill in the object's starting values.
self.name = name: Each new dog gets its OWN name box.
rex = Dog("Rex"): One blueprint...
bella = Dog("Bella"): ...as many objects as you like. Think of one house plan and a whole street of houses. bella's name box is completely separate from rex's.
print(rex.name): print(...) works exactly as in Intro to Python.
print(bella.name): print(...) works exactly as in Intro to Python. Two objects, two different names.