All

Question 1

What is an object?

Answer 1

a collection of data that is associated with certain behaviours

Question 2

Which statement is used when we have a function wit no content

Answer 2

pass statement

Question 3

What are arbitrary parameters

Answer 3

a function with a not known amount of arguments. * is used before the argument to let the code know.

Question 4

Whats the difference between a function and a method

Answer 4

methods require a parameter named self

Question 5

what is Inheritance?

Answer 5

creates a new class using the data & methods of another class (overerven van parent class)

Question 6

What is Encapsulation?

Answer 6

restricts the direct access to some data & behaviours (+public, -private)

Question 7

What is Polymorphism?

Answer 7

execute a single behaviour in various ways

Question 8

Explain the difference between Composition and Aggregation?

Answer 8

composition: class A acts as the container of class B (delete A -> delete B)
Aggregation: class A refers to class B (delete A does not delete B)

Question 9

give a example of a list?

Answer 9

list1 = [1,2,3]
list2 = [‘abc’, ‘def’]

Question 10

How to use the super() method and where is it for?

Answer 10

its used to inherit the functionality of the parent class

super(<childClass>, self).\_\_init\_\_()</childClass>

Question 11

Explain Method Resolution Order (MRO)?

Answer 11

MRO is a concept used in inheritance. It is the order in which a method is searched for in a classes hierarchy and is especially useful in Python because Python supports multiple inheritance.

Question 12

What is multievel - Vs. multiple inheritance?

Answer 12

multiple: classC(classA, classB):

Question 13

What is the difference between instance - and class attributes?

Answer 13

instance: only available in a certain object, example: self.x = 850
class: defined in the body of a class, example: x = 850

Question 14

What is the difference between equality and identity?

Answer 14

equality: ‘==’ used to check values of 2 objects are the same
identity: ‘is’ or ‘is not’ used to check memory adresses are the same

Question 15

Give an example of how to handle a attribute Error?

Answer 15

try:
X.append(6)
except AttributeError:
print(‘error message)

Question 16

Where does UML stand for?

Answer 16

Unified Modeling Language

Question 17

What are the 4 basic principels of OOP?

Answer 17

1. inheritance
2. abstraction
3. encapsulation
4. polymorphism