Python Class and Object

 

Python  Objects And Class

 

Defining a class in python

class MyNewClass:

    '''This is a docstring. I have created a new class'''

     pass

 

class MyClass:

    "This is my second class"

    a=10

    def func(self):

           print('Hello')

print(MyClass.a)

print(MyClass.func)

print(MyClass.__doc__)

Output

10

<function 0x7feaa932eae8="" at="" myclass.func="">

This is my second class

Creating An Object In Python

 

# A simple example class

class Test:

     # A sample method

     def fun(self):

     print("Hello world")

# creating object to a class test

obj=Test()

#Executing the class method

obj.fun()

Output

Hello world

>>>obj=Test()

 

Examples

class BankAccount:

    balance = 0

    def withdraw(self,amount):

         self.balance-=amount

         return self.balance

 

    def deposit(self,amount):

         self.balance += amount

         return self.balance

 

    def balanceCheck(self):

         print("\n New balance is...Rs.{}".format(self.balance))

    def bal_return(self):

         return(self.balance)

BT=BankAccount()

while True:

    print("1. Deposit\n")

    print("2. Withdraw\n")

    print("3. Balance\n")

    print("4. Exit")

    ch = int(input("Enter your choice..."))

    if ch == 1:

        while True:

          amt=int(input("Enter amount to Deposit..."))

          if amt>0:

            BT.deposit(amt)

            break

          else:

            print("Enter Valid mount")

            continue

    if ch == 2:

        while True:

           amt=int(input("Enter amount to withdraw..."))

           if BT.bal_return()>amt:

               BT.withdraw(amt)

               break

           else:

             BT.balanceCheck()

             print("\n Low balance.please Enter Less Amount..")

             continue

    if ch ==3:

            BT.balanceCheck()

    if ch ==4:

            break

 

Sample Input and output

1. Deposit

2. Withdraw

3. Balance

4. exit

Enter your Choice...1

Enter amount to deposit....2000

 

Enter your choice....1

Enter amount to deposit....-100

Enter Valid Amount

Enter amount to deposit...200

 

Enter Your choice...3

New balance is....Rs.2200

 

Enter your choice...2

Enter amount to withdraw...500

 

Enter your choice...3

New balance is...Rs.1700

 

Enter Your Choice....3

New balance is.....Rs.1700

 

Enter your Choice...2

Enter amount to withdraw....2000

low balance, please Enter less Amount..

Enter amount to withdraw...500

 

Enter your choice...3

New balance is...Rs.1200