Adding Chapter 3 files

Chapter3/composition/composition1.py

@@ -0,0 +1,32 @@
+#composition1.py
+class Seat:
+    def __init__(self, type):
+        self.i_type = type
+    def __str__(self):
+        return f"Seat type: {self.i_type}"
+
+class Engine:
+    def __init__(self, size):
+        self.i_size = size
+
+    def __str__(self):
+        return f"Engine: {self.i_size}"
+
+class Car:
+    def __init__(self, color, eng_size, seat_type):
+        self.i_color = color
+        self.engine = Engine(eng_size)
+        self.seat = Seat(seat_type)
+
+    def print_me(self):
+        print(f"This car of color {self.i_color} with {self.engine} and {self.seat}")
+
+
+if __name__ == "__main__":
+    car = Car ("blue", "2.5L", "leather" )
+    car.print_me()
+    print(car.engine)
+    print(car.seat)
+    print(car.i_color)
+    print(car.engine.i_size)
+    print(car.seat.i_type)