This Python Classes/Objects lesson is for a beginner. Read the short notes, run each example, then change one name or number and run it again.
class starts the template. Calling the class like a function builds an object. Each object has its own attributes.
Methods are functions defined inside the class. The first parameter is the object itself, by convention named self.
Example 1: Start here
Two Learner objects do not share a name unless you set one on the class itself.
class Learner: # a template for objects
def __init__(self, name): # runs when you create the object
self.name = name # store this on the object
def label(self): # define the function; it runs when you call it
return self.name.upper() # send this value back to the caller
print(Learner("Meera").label())
Example 2: Create and print
Student(\"Asha\") calls __init__ and returns the new object.
class Student: # a template for objects
def __init__(self, name): # runs when you create the object
self.name = name # store this on the object
print(Student("Asha").name)
Example 3: Add a method
greet reads the name that belongs to that student.
class Student: # a template for objects
def __init__(self, name): # runs when you create the object
self.name = name # store this on the object
def greet(self): # define the function; it runs when you call it
return "Hello " + self.name # send this value back to the caller
print(Student("Asha").greet())
Example 4: Change an attribute
Attributes can be updated after the object is created.
class Student: # a template for objects
def __init__(self, score): # runs when you create the object
self.score = score # store this on the object
asha = Student(70) # one object
asha.score = 82 # a whole number
print(asha.score)
Two Learner objects do not share a name unless you set one on the class itself.
