three files added for week4 homework

bank_account.py

@@ -0,0 +1,29 @@
+class BankAccount:
+    def __init__(self, accountNumber, name, balance):
+        self.accountNumber = accountNumber
+        self.name = name
+        self.balance = balance
+
+    def deposit(self,d):
+        self.balance+=d
+
+    def  withdrawal(self , w):
+        if self.balance <w : 
+            print (' Impossible operation! Insufficient balance!')
+        else:
+            self.balance-=w
+
+    def bankFees(self):
+        self.balance = self.balance - (self.balance*0.05)
+        return self.balance
+    def display(self) :
+        print (f'''
+      accountNumber: {self.accountNumber }
+      name: {self.name}
+      balance: {self.balance }''' )
+
+b=BankAccount (567894,'accountHolder', 5000)
+b.withdrawal(500)
+b.deposit(10000)
+b.bankFees()
+b.display()

rectangle.py

@@ -0,0 +1,23 @@
+class Rectangle:
+    def __init__(self, length, width):
+        self.length = length
+        self.width = width
+
+    def perimeter(self):
+        perimeter= 2 * (self.length + self.width)
+        return perimeter
+
+    def area (self):
+        area = self.length * self.width
+        return area
+
+    def display(self):
+        return f'''
+        length : {self.length }
+        width : {self.width }
+        perimeter :{self.perimeter()}
+        area : {self.area()}
+        '''
+
+r1=Rectangle(3,4)
+print (r1.display())

school.py

@@ -0,0 +1,42 @@
+class school:
+    students = []
+    enrolment = 0
+    def __init__(self,capacity):
+        self.capacity = capacity
+
+class student:
+    def __init__(self,name,age,gender):
+        self.name = name
+        self.age = age
+        self.gender = gender
+
+    def str (self):
+        return f'''
+        Name : {self.name}
+        Age : {self.age}
+        Gender : {self.gender}     
+        '''
+    def add_student(self, capacity):
+        school.enrolment = school.enrolment + 1
+        if school.enrolment <= capacity:
+            school.students.append(self)
+        else:
+            print("Sorry class capacity is full")
+
+
+    def print_student(self):
+        for i in school.students:
+            print (i.str())
+
+student1=student('Ali Sen', 19 ,'m')
+student2=student('Ayse Sahin', 18,'f')
+student3=student('Hasan Koc', 17, 'f')
+class1= school (2)
+
+student1.add_student(class1.capacity)
+student2.add_student(class1.capacity)
+student3.add_student(class1.capacity)
+
+student1.print_student()
+print(student1.__dict__)
+print(class1.__dict__)