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Questions and Answers
What keyword is used to create a class in Python?
What keyword is used to create a class in Python?
An object of a class can hold the same value for its fields as another object of the same class.
An object of a class can hold the same value for its fields as another object of the same class.
True
What method is automatically called when a new object is created in Python?
What method is automatically called when a new object is created in Python?
init
Attributes are also referred to as __________ of a class.
Attributes are also referred to as __________ of a class.
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What is the purpose of methods within a class?
What is the purpose of methods within a class?
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Memory is allocated for a class at the time of its definition.
Memory is allocated for a class at the time of its definition.
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What operator is used to access attributes and methods of an object?
What operator is used to access attributes and methods of an object?
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Match the following terms with their definitions:
Match the following terms with their definitions:
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Study Notes
Classes
- A class serves as a blueprint or template for creating objects.
- Contains attributes (data members) and methods (member functions) defining the object's properties and behaviors.
Key Components
- Attributes hold the state or data specific to an instance of a class.
- Methods define the actions or behaviors that instances of the class can perform.
Creating a Class
- Declaration begins with the
classkeyword followed by the class name. - Use the
__init__()method to initialize attributes for each instance of the class.
Objects
- An object is an instance of a class; memory is allocated only when an object is instantiated.
- Instantiation occurs by calling the class like a function to create an object.
Accessing Attributes and Methods
- Access attributes and methods of an object using the dot (
.) operator.
Fields (Attributes)
- Fields are variables within an object that store data specific to that instance.
- Each object maintains its unique state with potentially different values for attributes.
Purpose of Fields
- Allow distinct states for each object of a class, enabling different attributes and values across instances.
Methods (Functions)
- Defined within a class to specify behaviors or actions of class objects.
- Methods can manipulate the object's fields and modify its state.
Purpose of Methods
- Define possible operations for an object; for example, a
start()method for car objects enables starting functionality.
Constructors
- Special method invoked automatically upon the creation of a new object.
- Commonly named
__init__in Python, it initializes object fields with specific values.
Purpose of Constructors
- Ensures an object starts with a defined state upon creation.
- Sets initial values of an object’s fields based on parameters provided during instantiation.
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Description
This quiz covers the fundamental concepts of classes in Python programming. It includes information on attributes, methods, and object instantiation. Test your understanding of how to create and manipulate classes and objects in Python.
