Questions and Answers
What does Python primarily support?
What keyword is used to create a class in Python?
class
What function is automatically executed when a class is being instantiated?
init()
To create an object from a class named MyClass, use the syntax: p1 = ______()
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The self parameter must always be named 'self'.
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How can you modify an object's property in Python?
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What will happen if you try to delete an object's property that does not exist?
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To delete an object, use the ______ keyword.
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It is possible to create an empty class definition in Python.
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Study Notes
Python Classes and Objects
- Python is an object-oriented programming language where most entities are objects, complete with properties and methods.
- A class serves as a blueprint for creating objects, encapsulating data and functionality.
Creating a Class
- Use the
classkeyword to define a class. - Example of a simple class:
class MyClass: x = 5
Creating an Object
- Instantiate objects from a class using the defined class.
- Example of creating an object:
p1 = MyClass() print(p1.x)
The __init__() Function
- The
__init__()function initializes object properties and is automatically called upon object creation. - Example of using
__init__()to assign values:class Person: def __init__(self, name, age): self.name = name self.age = age
Object Methods
- Objects support methods, which are functions defined within the class affecting the object.
- Example of defining and calling a method:
def myfunc(self): print("Hello my name is " + self.name)
The self Parameter
- The
selfparameter represents the instance of the class and is necessary for accessing class variables and methods. - It can be renamed but must remain the first parameter in any class method.
Modifying Object Properties
- Object properties can be modified by direct assignment.
- Example of changing an object's property:
p1.age = 40
Deleting Object Properties
- The
delkeyword is used to remove properties from an object. - Example of deleting an object's property:
del p1.age
Deleting Objects
- Entire objects can be deleted with the
delkeyword. - Example of deleting an object:
del p1
The pass Statement
- Class definitions cannot be empty; use the
passstatement to avoid errors in empty classes. - An example of an empty class:
class Person: pass
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Test your knowledge of Python classes and objects with these flashcards. Learn key concepts, definitions, and how to create classes using Python's object-oriented programming features. Perfect for beginners and those looking to refresh their understanding.
