Python Lab - Day 2

Python Labs  2^nd   Day

1. Class Demo in Python
2. Constructor and Destructors in Python
3. Data Hiding in Class in Python
4. Inheritance in Python
5. Self Keyword in python
6. Exception Handling in Python
7. Documentation functions
8. Consume User Module in Python
9. OS import module demo in python Lab
10. Time and calendar import demo in python

Lab 1

Class Demo

class Car:     "my class contains method"     price = 0     year = 0     rateofintrenet = 0     def getmodelandyear(self,year,model):         print("Your Model {0} and  price is {1}".format(year,model))     def getpriceofcar(self,val):         s = val.price * val.year * val.rateofintrenet / 100         return s c = Car() c.getmodelandyear(2,"honda") c.price = 2000000 c.year = 5 c.rateofintrenet = 5 result = c.getpriceofcar(c) print("price : ", result) #print("price : ", Car.getmodelandyear(34,23)) print(c.__doc__)

Lab 2

Constructor and Destructors in Python

# construtor and destrctor import math class Demo :     count = 0     def __init__(self):         print("Object loaded",Demo.count)        # self.count + 1         Demo.count += 1     def func(self):         print("Constructor demo")     def __del__(self):         print("Object Gone") #print(math.factorial(100000)) d1 = Demo() del d1 d2 = Demo() d2.func()

Lab 3 :

Data Hiding in Class in Python

# data hiding class Demo:     __id =  1234     emp = 1111     def show(self):         print(self.__id)     def __str__(self):         return "From str method of Test: a is %s," \                "b is %s" % (self.__id, self.emp) d1 = Demo() #print(Demo.__id) print(d1.emp) print(d1._Demo__id) d1.show() print(d1)

Lab 4

Inheritance in Python

#Inheritence class A:     def __f1(self):   # defining private method         print("i am class A") class C:     def f1(self):         print("i am Virtual class")     def f2(self):         print("i am class C") class B(A,C):     def f1(self):         super(B,self).f1()     def f3(self):         print("i am class B")

Lab 5

Self Keyword in python

# class sample and having self heyword class Bike :     count =0     def __init__(self,noofbike):         self.count = noofbike     def typeofbike(self, bikename):         print("you have selected bike {1} of {0} type".format(bikename,self.count)) h1 =  Bike(2) h1.typeofbike("honda")

Lab 6

Exception Handling in Python

a = [1,2,3] try:     print(a[2])     raise NameError("This is an error") except NameError as err:     print("named error",err.args) except IndexError as err:     print("Having Index error",err.args) except ZeroDivisionError as err:     print("Error in code", err) except Exception as err:     print("Error in code", err) finally:     print("will definitely execute")

Lab 7

Documentation functions

def demo():     '''     i don't know why i am using this function.     '''     print("Documentaion") demo() help(demo) class MyClass:     a= 10     def func(self):         print("hello") print(MyClass.a) print(MyClass.func)

Lab  8

Consume User Module in Python

from modules_demo import * testmodule() print(MyCalculation(1,2))

Lab 9

OS import module demo in python Lab

import os import  math print(os.getcwd()) print(math.factorial(12)) ''' a= 45.7878787878 print(math.ceil(a)) print(math.floor(a)) print("{0:.2f}".format(a)) print(round(a,2)) print("{0:.2}".format(a)) ''' #os.chdir()

Lab 10

Time and calendar import demo in python

import time import calendar print(time.localtime()) print(calendar.calendar(2018))