Learning python -Day 8

Class is a collection of data members and member functions

Objects is an instance of the classs. Objects contains all the information of the class.

OOP:

1)      Encapsulation: wraping and binding of data

2)      Polymorphism: many forms

3)      Abstarction: hiding of details

4)      Inheritance: reusability of old. Types of inheritance:

a)      Single inheritance

b)      Multilevel inheritance

c)      Tree

d)      Multiple

e)      Hybrid

class Emp:
    comp="TCS"
    def disp(self):
        print("Hello",self.name)


ravi=Emp()
ravi.name="Ravi Kumar"
ravi.age=29
ravi.id=1234
ravi.city="Noida"

print(ravi.name,ravi.age,ravi.id,ravi.city)

tom=Emp()
tom.name="Tom"
tom.id=4763
tom.degree="BCA"
print(tom.name,tom.id,tom.degree)
print(ravi.comp,tom.comp,Emp.comp)

run the function CTL+shift+fn+F10

Ravi Kumar 29 1234 Noida

Tom 4763 BCA

class Emp:
    comp="TCS"
    def setValues(self,nname,nid,ncity):
        self.name=nname
        self.id=nid
        self.city=ncity
    def disp(self):
        print("Hello",self.name,self.id,self.city)


ravi=Emp()
ravi.setValues("Ravi Kumar",1234,'Noida')
ravi.disp()

tom=Emp()
tom.setValues("Tom",94845,"Delhi")
tom.disp()

run the function CTL+shift+fn+F10

Hello Ravi Kumar 1234 Noida

Hello Tom 94845 Delhi

class Emp:
    comp="TCS"
    def __init__(self,nname,nid,ncity):
        self.name=nname
        self.id=nid
        self.city=ncity
    def disp(self):
        print("Hello",self.name,self.id,self.city)


ravi=Emp("Ravi Kumar",1234,'Noida')
ravi.disp()

tom=Emp("Tom",94845,"Delhi")
tom.disp()

run the function CTL+shift+fn+F10

Hello Ravi Kumar 1234 Noida

Hello Tom 94845 Delhi

Single inheritance:

class A:
    x=10
    def sum(self,a,b):
        print('Sum=',(a+b))

class B(A):
    y=20
    def mul(self,a,b):
        print("Mul=",a*b)

o1=B()
print(o1.x,o1.y)
o1.sum(15,60)
o1.mul(18,5)

run the function CTL+shift+fn+F10

10 20

Sum= 75

Mul= 90

Multi Level inheritance

class A:
    x=10
    def sum(self,a,b):
        print('Sum=',(a+b))

class B(A):
    y=20
    def mul(self,a,b):
        print("Mul=",a*b)
class C(B):
    z=30
    def mod(self,a,b):
        print("Mod=",a%b)

o1=C()
print(o1.x,o1.y,o1.z)
o1.sum(15,60)
o1.mul(18,5)
o1.mod(19,4)

run the function CTL+shift+fn+F10

10 20 30

Sum= 75

Mul= 90

Mod= 3

Tree Inheritance

class A:
    x=10
    def sum(self,a,b):
        print('Sum=',(a+b))

class B(A):
    y=20
    def mul(self,a,b):
        print("Mul=",a*b)
class C(A):
    z=30
    def mod(self,a,b):
        print("Mod=",a%b)

o1=C()
print(o1.x,o1.z)
o1.sum(15,60)
o1.mod(19,4)

run the function CTL+shift+fn+F10

10 30

Sum= 75

Mod= 3

Multile inheritance

class A:
    x=10
    def sum(self,a,b):
        print('Sum=',(a+b))
    def disp(self):
        print("Gud Mrng")

class B:
    y=20
    def mul(self,a,b):
        print("Mul=",a*b)
    def disp(self):
        print("Gud Evng")

class C(A,B):
    z=30
    def mod(self,a,b):
        print("Mod=",a%b)

o1=C()
print(o1.x,o1.y,o1.z)
o1.sum(15,60)
o1.mul(18,5)
o1.mod(19,4)
o1.disp()

run the function CTL+shift+fn+F10

10 20 30

Sum= 75

Mul= 90

Mod= 3

Gud Mrng

    def disp(self):
        print("Gud Evng")

class C(A):
    z=30class A:
    x=10
    def sum(self,a,b):
        print('Sum=',(a+b))
    def disp(self):
        print("Gud Mrng")

class B(A):
    y=20
    def mul(self,a,b):
        print("Mul=",a*b)
    def mod(self,a,b):
        print("Mod=",a%b)

class D(B,C):
    w=40
    def div(self,a,b):
        print("Div=",a/b)

o1=D()
print(o1.x,o1.y,o1.z,o1.w)
o1.sum(15,60)
o1.mul(18,5)
o1.mod(19,4)
o1.div(16,7)
o1.disp()

For security, make variables private. Put  double underscore__

class Emp:
    comp="TCS"
    def __init__(self,nname,nid,ncity):
        self.__name=nname
        self.__id=nid
        self.__city=ncity
    def disp(self):
        print("Hello",self.__name,self.__id,self.__city)

    @classmethod
    def changeValue(cls,ncom):
        cls.comp=ncom


ravi=Emp("Ravi Kumar",1234,'Noida')
ravi.disp()

tom=Emp("Tom",94845,"Delhi")
tom.disp()
tom.changeValue("Tata")
print(ravi.comp)

run the function CTL+shift+fn+F10

Hello Ravi Kumar 1234 Noida

Hello Tom 94845 Delhi

Tata

You use classmethod to change the vaue of comp in above environment

class Emp:
    comp="TCS"
    def __init__(self,nname,nid,ncity):
        self.name=nname
        self.id=nid
        self.city=ncity
    def disp(self):
        print("Hello",self.name,self.id,self.city)

    @classmethod
    def changeValue(cls,ncom):
        cls.comp=ncom


ravi=Emp("Ravi Kumar",1234,'Noida')
ravi.disp()

tom=Emp("Tom",94845,"Delhi")
tom.disp()
tom.changeValue("Tata")
print(ravi.comp)

run the function CTL+shift+fn+F10

Hello Ravi Kumar 1234 Noida

Hello Tom 94845 Delhi

Tata

Random Modules are pre defined modules

import random

for i in range(10):
    print(random.randint(1,10))

run the function CTL+shift+fn+F10

9

2

2

1

5

4

4

3

4

8

Randint is a functionnwhich gives you a random value within the range

random.randrange(1,10) generate a number between 1 and 9

random.uniform(1,10) will give you unique value

import random
list1=[10,20,30,40,50]
print(random.choice(list1))

run the function CTL+shift+fn+F10

50

import random
list1=[10,20,30,40,50]
random.shuffle(list1)
print(list1)

run the function CTL+shift+fn+F10

 [40, 20, 10, 50, 30]

import secrets
list1=[10,20,30,40,50]
print(secrets.choice(list1))

run the function CTL+shift+fn+F10

20

import time

print(time.time())
print(time.ctime())
print(time.gmtime())

import calendar
print(calendar.calendar(2019))
print(calendar.month(2019,10))
print(calendar.isleap(2020))

run the function CTL+shift+fn+F10

1572931743.445168

Tue Nov  5 10:59:03 2019

time.struct_time(tm_year=2019, tm_mon=11, tm_mday=5, tm_hour=5, tm_min=29, tm_sec=3, tm_wday=1, tm_yday=309, tm_isdst=0)

                                  2019

      January                   February                   March

Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su

    1  2  3  4  5  6                   1  2  3                   1  2  3

 7  8  9 10 11 12 13       4  5  6  7  8  9 10       4  5  6  7  8  9 10

14 15 16 17 18 19 20      11 12 13 14 15 16 17      11 12 13 14 15 16 17

21 22 23 24 25 26 27      18 19 20 21 22 23 24      18 19 20 21 22 23 24

28 29 30 31               25 26 27 28               25 26 27 28 29 30 31

       April                      May                       June

Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su

 1  2  3  4  5  6  7             1  2  3  4  5                      1  2

 8  9 10 11 12 13 14       6  7  8  9 10 11 12       3  4  5  6  7  8  9

15 16 17 18 19 20 21      13 14 15 16 17 18 19      10 11 12 13 14 15 16

22 23 24 25 26 27 28      20 21 22 23 24 25 26      17 18 19 20 21 22 23

29 30                     27 28 29 30 31            24 25 26 27 28 29 30

        July                     August                  September

Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su

 1  2  3  4  5  6  7                1  2  3  4                         1

 8  9 10 11 12 13 14       5  6  7  8  9 10 11       2  3  4  5  6  7  8

15 16 17 18 19 20 21      12 13 14 15 16 17 18       9 10 11 12 13 14 15

22 23 24 25 26 27 28      19 20 21 22 23 24 25      16 17 18 19 20 21 22

29 30 31                  26 27 28 29 30 31         23 24 25 26 27 28 29

                                                    30

      October                   November                  December

Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su      Mo Tu We Th Fr Sa Su

    1  2  3  4  5  6                   1  2  3                         1

 7  8  9 10 11 12 13       4  5  6  7  8  9 10       2  3  4  5  6  7  8

14 15 16 17 18 19 20      11 12 13 14 15 16 17       9 10 11 12 13 14 15

21 22 23 24 25 26 27      18 19 20 21 22 23 24      16 17 18 19 20 21 22

28 29 30 31               25 26 27 28 29 30         23 24 25 26 27 28 29

                                                    30 31

    October 2019

Mo Tu We Th Fr Sa Su

    1  2  3  4  5  6

 7  8  9 10 11 12 13

14 15 16 17 18 19 20

21 22 23 24 25 26 27

28 29 30 31

True

User defined modules

def sum(x,y):
    print("Sum=",x+y)

def sub(x,y):
    print("Sub=",x-y)

if __name__=="__main__":
    print("This is main module")

run the function CTL+shift+fn+F10

This is main module

import module1



def mul(x,y):

    print("Mul=",x*y)



module1.sum(10,30)

module1.sub(19,3)

mul(15,5)

run the function CTL+shift+fn+F10

Sum= 40

Sub= 16

Mul= 75

from module1 import sum

sum(10,23)

run the function CTL+shift+fn+F10

Sum= 33

Learning python -Day 9