Podcast
Questions and Answers
What is instantiation in the context of object-oriented programming?
What is instantiation in the context of object-oriented programming?
- Destroying an instance of a class
- Creating a new instance of a class (correct)
- Altering the structure of a class
- Running a class method
How is an object instantiated in Python when the constructor requires no parameters?
How is an object instantiated in Python when the constructor requires no parameters?
- Widget(a, b, c)
- Call a function that creates the instance
- w = Widget() (correct)
- temperature = 98.6
What does the term 'literal form' refer to in Python's object instantiation?
What does the term 'literal form' refer to in Python's object instantiation?
- Syntax error in code
- Using built-in functions for instantiation
- Designating new instances directly (correct)
- Creating an object without a constructor
When would you use a syntax like 'Widget(a, b, c)' for instantiation?
When would you use a syntax like 'Widget(a, b, c)' for instantiation?
How can a new instance of a list class be created indirectly in Python?
How can a new instance of a list class be created indirectly in Python?
Which of the following is NOT mentioned as a method for creating new instances in Python?
Which of the following is NOT mentioned as a method for creating new instances in Python?
Study Notes
Instantiation in Object-Oriented Programming
- Instantiation in OOP creates an object from a class, where the object is an instance of the class
Object Instantiation in Python
- In Python, an object is instantiated by calling the class as a function and passing in any required arguments
- If the constructor requires no parameters, an object is instantiated by calling the class without arguments, e.g.,
MyClass()
Literal Form in Python
- In Python, literal form refers to the direct creation of an object, e.g.,
list()or10for an integer - Literal form is a concise way to create objects in Python
Syntax for Instantiation
- The syntax
Widget(a, b, c)is used for instantiation when the class constructor requires arguments, e.g.,a,b, andc
Creating a List Instance in Python
- A new instance of a list class can be created indirectly in Python by using the
list()function or by using the literal form, e.g.,[]
Methods for Creating New Instances in Python
- The following are methods for creating new instances in Python: literal form, direct creation using the
list()function, and calling the class as a function - Using
__new__method is NOT mentioned as a method for creating new instances in Python
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Description
Learn about the process of creating a new instance of a class through instantiation in object-oriented programming. Understand the syntax for instantiating an object by invoking the constructor of a class with or without parameters.
