Python Learning OOPs Part -2

 

class Dog:
    
    # Class Object Attribute
    species = 'mammal'
    
    def __init__(self,breed,name):
        self.breed = breed
        self.name = name 

Lets break down what we have above.The special method

__init__()

is called automatically right after the object has been created, similer to construct() in php

self argument is necessary in python, php has default so no need to pass in php

sam = Dog('Lab','Sam')
//here creating the instance of the class, no need to pass new keyword in python

Inheritance:

class Animal:
    def __init__(self):
        print("Animal created")

    def whoAmI(self):
        print("Animal")


class Dog(Animal): // Inherating the Animal Class
    def __init__(self):
        Animal.__init__(self)
        print("Dog created") 

Error Handling & Exception :  

 

try:
    f = open('testfile','r')
    f.write('Test write this')
except IOError:
    # This will only check for an IOError exception and then execute this print statement
    print("Error: Could not find file or read data")
else:
    print("Content written successfully")
    f.close()

 Here first try to run the code in try block if any error related to IOerror then it will log otherwise else will run

 so either except or else will run , 

def askint():
    try:
        val = int(input("Please enter an integer: "))
    except:
        print("Looks like you did not enter an integer!")

    finally:
        print("Finally, I executed!")
    print(val)
Here Finally Block will execute everytime either it pass or fail. 

pylint Library: its similar to coder module in drupal. to check the error and formats.