Class Object Constructor Alternative Constructor

#this lecture is 53,54,55,56,57,58# Class is a template where we fill 

the things according to requirements

class student:
    pass   # if we donot want to enter any method or function  

          # then we use pass other wise error will occure

.harry = student() #class object or instancetarry = student()
harry.name = "Harry" #set properties to object.

harry.standard = 12

harry.section = "A"

tarry.name = "Tarry"

tarry.section = "B"
print(f"My name is {harry.name}, the section of tarry is {tarry.section}")
tarry.subjects = ["urdu","math","Chemistry","Biology"]
print(tarry.subjects)

#55 instance or object and class veriables

class Employee:

    no_of_leaves = 8    

pass

ali = Employee()
sameer = Employee()
ali.name = "Ali"

ali.salary = 50000

ali.role = "Data Scientist"

sameer.name = "Sameer"

sameer.salary = 60000

sameer.role = "Android Developer"

print(Employee.no_of_leaves)
print(Employee.__dict__) # show attributes associated with employee class

Employee.no_of_leaves = 9

print(Employee.no_of_leaves)

#56 Use of Self in Class

class Employee2:
    total_leaves = 8    

def printDetails(self):
        return f"name is {self.name}, Salary {self.salary}, role {self.role}"
Akram = Employee2();
Akram.name = "Akram"

Akram.salary = 54222

Akram.role = "MyRol"

print(Akram.printDetails())# here Akaram is self.

#57 Class Constructur __init__

class Employee3:
    def __init__(self,ename,esalary,erole):  #Creating Constructor     

   self.name = ename      # assign the value to arugments       

 self.salary = esalary
        self.role = erole
Shaiz = Employee3("Shaiz",2542,"Instuctor") # pass the value in Consturctor

print(f"Name: {Shaiz.name}, Salary: {Shaiz.salary}, Role: {Shaiz.role}") #print the values

#57 Class Mehtod

class Employee4:
    leavs = 45    

@classmethod   

 def change_leaves(cls, newleaves): # if we want to class level change then we can use the class                                    

# class method to change it permanenetly.        

cls.leavs = newleaves
        return newleaves
asad = Employee4()
print(f"before changing the leaves: {asad.leavs}")
l = asad.change_leaves(34)
print("Asad New Leaves",l)
print("Asad old leaves: ",asad.leavs)
Amjad = Employee4()
print(Amjad.leavs)

# 58 Class method as alternative Constructor

class Employee5:
    def __init__(self,ename,esalary,erole):  #Creating Constructor           

self.name = ename      # assign the value to arugments           

self.salary = esalary
           self.role = erole
    @classmethod   

 def from_dash(cls,string):
        return cls(*string.split("-"))
Basit = Employee5.from_dash("Basit Ali-4511-student")
print(f"Name {Basit.name} Salary: {Basit.salary}, Role: {Basit.role}")

Lec # 52 Python Decorators

# #DECORATORS ARE THE MODIFYING THE FUNCTIONS# 

def function1():

#     x = print("This is simple function 1")

#     return "this is old"## function2 = function1 

# Coppying function# del function1

 # function 1 is coppied in function 2 so, its fine# print(function2())

def dec1 (func1):
    def nowexe():
        print("Now Execute function is runs!")
        func1() #it is location where the function 

                #having decoration will execute like WhoIsShaiz       

        print("Executed")
        return nowexe
@dec1def whoIsShaiz():
    print("Shaiz is a good boy")
whoIsShaiz()

Python Variable and IF Statement input statement

var1 = "hello world"

print(var1)
var2 = 4

var3 = 36.7

print(var2,type(var3))
var = 454

sum = var * 2.22

print (sum)
print (set([1,2,3]))
var6 = "pakistan my CountrY"

print(var6.upper())
print(var6.lower())
print(int(var3))
print("pakistan " + str(var2))
print("black holes")
a = 45; b= 65; c = 59sum = a +b +c
print(sum)
a = 10b = 50if(a>b):
    print("A is greater")
elif(b==a):
    print("A and B are equal")
else:
    print("B is greater")

'''print (10 * "Hello World\n\n")

print("Enter your name")

name = int(input())

value =str(( name +22))

print(" your result is " + value)'''

print("Enter first number:")

number1 = int(input())
print("Enter second number:")
number2 = int(input())
sum = number1 + number2
print("sum of ",number1,"and",number2," is ",sum)