class MyStore:
_prod_code= []
_prod_name= []
_ cost_price= []
_prod_quant= []
def getdata(self):
self.p = int(input("Enter no. of products you need to store: "))
for x in range(self.p):
self._prod_code.
append(int(input("Enter Product Code: ")))
self._prod_name.append(str(input("Enter Product Name: ")))
self._ cost_price.append(int(input("Enter Cost price: ")))
def display(self):
print("Stock in Stores")
print(" ---------------------------------- ")
print("Product Code \t Product Name \t Cost Price")
print(" ------------------------------------- ")
for x in range(self.p):
print(self._prod_code[x], "\t\t", self._prod_name[x], "\t\t", self._cos_ price [x])
print(" ---------------------------------")
def print_bill(self):
total_price = 0
for x in range( self.p):
q=int(input("Enter the quantify for the product code %d : "%self._ prod_code [x]))
self._prod_quant.append(q)
total_price = total_price +self._cost_
price[x]*self._prod_quant[x]
print(" Invoice Receipt ")
print(" --------------------------------------")
print("Product Code\t Product Name\t
Cost Price\t Quantity \t Total Amount")
print(" ------------------------------------ ")
for x in range(self.p):
print(self._prod_code[x], "\t\t", self._prod_name[x], "\t\t",
self._cost_price[x], "\t\t", self._prod_quant[x], "\t\t",
self._pro d_ quan t [x] *self._cost_price [x])
print(" -----------------------------------")
print(" Total Amount = ", total_price)

Class String:
def _init_(self):
self.uppercase=()
self.lowercase=()
self.vowels=()
self.consonants=()
self.spaces=()
self.string= " "
def getstr (self):
self.string=str(input("Enter a String: "))
def count_upper(self):
for ch in self.string:
if (ch.isupper()):
self.uppercase+= 1
def count_Iowert(self):
for ch in self.string:
if (ch.islower()):
self.lowercase+= 1
def count_vowels(self):
for ch in self.string:
if (ch in ('A', 'a', 'e', 'E', 'i', 'I', 'o', 'O', 'u', 'U')):
self.vowels+=1
def count_consonants(self):
for ch in self.string:
if (ch not in ('A', 'a', 'e', 'E', 'i', 'I', 'o', 'O', 'u', 'U')):
self.consonants+= 1
def count_space(self):
for ch in self.string:
if (ch==" ''):
self.spaces+= 1
def execute(self):
self.count_upper()
self.count_lower ()
self.count_vowels ()
self.count_consonants()
self.count_space()
def display(self):
print("The given string contains ...")
print("%d Uppercase letters"%self. uppercase)
print("%d Lowercase letters"%self. lowercase)
print("%d Vowels"%self.vowels)
print("%d Consonants"%self.consonants)
print("%d Spaces"%self.spaces)
S = String()
S.getstr()
S.execute()
S.display()
Output:
Enter a string: Welcome To Learn Computer Science
The given string contains...
5 Uppercase letters
24 Lowercase letters
13 vowels
20 consonants
4 Spaces

class Library:
def _init_(self):
self.bookname= ""
self.author='"
def getdata(self):
self.bookname = input("Enter Name of the Book: ")
self.author = input("Enter Author of the Book: ")
def display(self):
print("Name of the Book: ",self.bookname)
print("Author of the Book: ",self.author)
print("\n")
book= [] #empty list
ch = 'y'
while( ch=='y'):
print("1. Add New Book \n 2.Display Books")
resp = int(input("Enter your choice: "))
if(resp==1):
L=Library()
L.getdata()
book.append(L)
elif(resp==2):
for x in book:
x.display()
else:
print("Invalid input....")
ch = input("Do you want continue ....")
Output
1. Add New Book
2. Display Books
Enter your choice: 1
Enter Name of the Book: Programming in C++
Enter Author of the Book: K. Kannan
Do you want to continue...y
1. Add New Book
2. Display Books
Enter your choice: 1
Enter Name of the Book: Advanced Python
Enter Author of the Book: Dr. vidhya
Do you want continue.... n

class Circle:
pi=3.14
def _init_(self.radius):
self.radius=radius
def area(self):
return Circle. pi*(self.radius**2)
def circumference(self):
return 2*Circle.pi*self.radius
r=int(input("Enter Radius: "))
Ce=Circle(r)
print("The Area =",C.area())
print("The Circumference =", Cxircumferencet())

class test;
def check (self, num)
if num> 0:
print (num, "is positive number")
else:
print (num, "is negative number")
n = test ()
x = int (input("Enter the number"))
n. check (x)