Classes - Foundations of OOP
13 important questions on Classes - Foundations of OOP
If we assume that pythons, vipers, and cobras are subclasses of the same superclass, how would you call it?
Write the very first line of the 'Python' class declaration, expressing the fact that the new class is actually a subclass of Snake.
Assume that there is a class named Snakes
class Python(Snakes):
Something is missing from the following declaration – what?
class Snakes:
def __init__():
self.sound = 'Sssssss'
class Snakes:
def __init__(self):
self.sound = 'Sssssss'
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Modify the code to guarantee that the venomous property is private.
class Snakes:
def __init__(self):
self.venomous = True
class Snakes:
def __init__(self):
self.__venomous = True
Modify the code to guarantee that the venomous property is private.
class Snakes:
def __init__(self):
self.venomous = True
class Snakes:
def __init__(self):
self.__venomous = True
class ExampleClass:
def __init__(self, val = 1):
self.first = val
def set_second(self, val):
self.second = val
example_object_3 = ExampleClass(4)
example_object_3.third = 5
Is it possible to assign 5 to example_object_3.third when it is not made inside the class?
Explain a class variable and mention a use
- Useful for storing values common to all objects, like a counter how many classes have been created
Which of the Python class properties are instance variables and which are class variables? Which of them are private?
class Python:
population = 1
victims = 0
def __init__(self):
self.length_ft = 3
self.__venomous = False
What do you call a function embedded in a class?
Name two things a constructor (__init__(self): ) cannot do:
- Return a value.
- Be called explicitly like a regular method.
The declaration of the Snake class is given below. Enrich the class with a method named increment(), adding 1 to the victims property.
class Snake:
def __init__(self):
self.victims = 0
self.victims += 1
Redefine the Snake class constructor so that is has a parameter to initialize the victims field with a value passed to the object during construction.
class Snake: def __init__(self): self.victims = 0
def __init__(self,vic)
self.victims = vic
Class Snake:
pass
class Python(Snake):
pass
print(Python.__name__, 'is a', Snake.__name__)
print(Python.__bases__[0].__name__, 'can be a', Python.__name__)
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