Python Classes Quick Reference

Simple Class
Member Variables
Constructor
String Representation

1. Simple Class



In [2]:

    
# simple definition.  All member functions must take parameter self (this in c++)

class Car:
    def drive(self):
        print('vroom vroom...')
        
miata = Car()
miata.drive()









    



vroom vroom...

2. Member Variables



In [3]:

    
# declare variable

class Car:
    make = 'unknown car type'
    def drive(self):
        print('driving my %s vroom vroom...' % self.make)

miata = Car()
miata.make = 'miata'
miata.drive()









    



driving my miata vroom vroom...

3. Constructor



In [4]:

    
# constructor syntax

class Car:
    make = 'unknown car type'
    def __init__(self,make):
        self.make=make
    def drive(self):
        print('driving my %s vroom vroom...' % self.make)

maiata=Car('miata')
miata.drive()
miata.make









    



driving my miata vroom vroom...






    Out[4]:





'miata'

4. String Representation



In [5]:

    
#used to sort objects that dont natively support comparison
class User:
    def __init__(self, user_id):
        self.user_id = user_id
    def __repr__(self):
        return 'User({})'.format(self.user_id)
        
User(23)









    Out[5]:





User(23)



In [ ]:

Python Classes Quick Reference

Table Of Contents

1. Simple Class

2. Member Variables

3. Constructor

4. String Representation