practice4.py

# Quadrilateral with Inheritance


# Implement a class called Quadrilateral with a constructor method that initializes two instance properties: length and width.

# Implement a second class called Square that inherits from Quadrilateral.

# Create a constructor method in the Square class that initializes two instance properties length and width -- only if the two values passed into the constructor are equal.

# If the two values are not equal, raise an Exception with the message "A square must have an equal length and width."

# If the values are equal, use the super() function to initialize the same two instance properties from the Quadrilateral class's constructor method.
# Write your class here.

class Quadrilateral:
  def __init__(self, length, width):
    self.length = length
    self.width = width

class Square(Quadrilateral):
  def __init__(self, length, width):
    if length == width:
      super().__init__(length, width)
    else:
      raise Exception('A square must have an equal length and width.')


quad = Quadrilateral(20, 10)
print(f"{quad.length}, {quad.width}") # 20, 10

square = Square(10, 10)
print(f"{square.length}, {square.width}") # 10, 10

try:
  not_square = Square(5, 10) # Exception: A square must have an equal length and width.
except Exception as e:
  print(repr(e))