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46 lines (34 loc) · 1.9 KB
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"""Class Definition Syntax.
@see: https://docs.python.org/3/tutorial/classes.html
Python is an object oriented programming language.
Almost everything in Python is an object, with its properties and methods.
A Class is like an object constructor, or a "blueprint" for creating objects.
"""
def test_class_definition():
"""Class definition."""
# Class definitions, like function definitions (def statements) must be executed before they
# have any effect. (You could conceivably place a class definition in a branch of an if
# statement, or inside a function.)
class GreetingClass:
"""Example of the class definition
This class contains two public methods and doesn't contain constructor.
"""
name = 'user'
def say_hello(self):
"""Class method."""
# The self parameter is a reference to the class itself, and is used to access variables
# that belongs to the class. It does not have to be named self , you can call it
# whatever you like, but it has to be the first parameter of any function in the class.
return 'Hello ' + self.name
def say_goodbye(self):
"""Class method."""
return 'Goodbye ' + self.name
# When a class definition is entered, a new namespace is created, and used as the local scope —
# thus, all assignments to local variables go into this new namespace. In particular, function
# definitions bind the name of the new function here.
# Class instantiation uses function notation. Just pretend that the class object is a
# parameterless function that returns a new instance of the class. For example the following
# code will creates a new instance of the class and assigns this object to the local variable.
greeter = GreetingClass()
assert greeter.say_hello() == 'Hello user'
assert greeter.say_goodbye() == 'Goodbye user'