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Questions and Answers

What is a specification like 'A generic shape in a drawing package must be able to do' sometimes called?

  • A requirement
  • A contract (correct)
  • A blueprint
  • A guideline

    • What reduces cognitive load by allowing the people using related things to ignore their differences?

  • Inheritance
  • Encapsulation
  • Abstraction
  • Polymorphism (correct)

    • What kind of object contains the instructions to print a string in Python?

  • A function (correct)
  • An instance
  • A variable
  • A class

    • What does OOP historically aim to solve?

    <p>Two problems</p> Signup and view all the answers

    What can be stored in data structures like lists and dictionaries in Python's object system?

    <p>Both objects and methods</p> Signup and view all the answers

    How are objects and methods represented in Python's object system?

    <p>Objects as dictionaries and methods as functions that take the object as their first parameter</p> Signup and view all the answers

    What allows for reliable identification of objects' classes and checking if two objects are of the same class in Python's object system?

    <p>Storing methods in a dictionary corresponding to a class</p> Signup and view all the answers

    What is the mechanism called in Python for handling different numbers of arguments and spreading to match a function's parameters?

    <p>Varargs</p> Signup and view all the answers

    How can inheritance be implemented in Python's object system?

    <p>By creating a dictionary to represent a generic shape and adding a method to calculate density</p> Signup and view all the answers

    What is the key used to implement constructors in the dictionaries that represent classes in Python's object system?

    <p>_new</p> Signup and view all the answers

    Which mechanism in Python allows for modifying the find function to use recursion instead of a loop?

    <p>Inheritance</p> Signup and view all the answers

    What do methods defined in Python's object system operate on?

    <p>Values stored in the object's dictionary and don't take extra arguments as input</p> Signup and view all the answers

    What is the special key used in Python's object system to represent a function that builds something of a specific type?

    <p>_new</p> Signup and view all the answers

    How can multiple inheritance be understood in Python's object system?

    <p>In terms of dictionaries containing references to properties, functions, and other dictionaries</p> Signup and view all the answers

    What does the text provide exercises for in Python's object system?

    <p>Adding versions of Python type method and isinstance to dictionary-based objects and classes</p> Signup and view all the answers

    What does the text evaluate the understandability and efficiency of in Python's object system?

    <p>The different versions of Python type method and isinstance</p> Signup and view all the answers

    What is the term used to describe the ability to use derived classes interchangeably with their base class in Python's object-oriented programming?

    <p>Polymorphism</p> Signup and view all the answers

    What is a specification like 'A generic shape in a drawing package must be able to do' sometimes called in Python's object-oriented programming?

    <p>Contract</p> Signup and view all the answers

    What does Python create in memory when executing a function, containing the instructions to perform the function's task?

    <p>An object</p> Signup and view all the answers

    What is the term for the mechanism in Python that allows for creating an alias for a function by assigning it to another variable?

    <p>Function aliasing</p> Signup and view all the answers

    What was the motivating problem used in the text to define the requirements for a generic shape in a drawing package in Python's object-oriented programming?

    <p>Defining the capabilities of a generic shape</p> Signup and view all the answers

    What does the term 'object-oriented programming' historically aim to solve?

    <p>Two problems</p> Signup and view all the answers

    What does a function represent as an object in Python's object-oriented programming?

    <p>Instructions</p> Signup and view all the answers

    What does the concept of polymorphism reduce in Python's object-oriented programming?

    <p>Cognitive load</p> Signup and view all the answers

    What is the key feature that allows derived classes to share common methods with their base class in Python's object-oriented programming?

    <p>Inheritance</p> Signup and view all the answers

    What are the bytes in a function object in Python used to represent?

    <p>Instructions</p> Signup and view all the answers

    What does the concept of polymorphism allow in Python's object-oriented programming?

    <p>Interchangeable use of related objects</p> Signup and view all the answers

    What is the term for the ability of a function to be treated as an object in Python's object-oriented programming?

    <p>Function objectification</p> Signup and view all the answers

    How are objects represented in Python's object system?

    <p>As a special kind of dictionary</p> Signup and view all the answers

    What allows for reliable identification of objects' classes and checking if two objects are of the same class in Python's object system?

    <p>Storing methods in a dictionary that corresponds to a class</p> Signup and view all the answers

    What is the mechanism in Python for handling different numbers of arguments and spreading to match a function's parameters?

    <p>Varargs</p> Signup and view all the answers

    How can inheritance be implemented in Python's object system?

    <p>By creating a dictionary to represent a generic shape and adding a method to calculate density</p> Signup and view all the answers

    What is the key used to implement constructors in the dictionaries that represent classes in Python's object system?

    <p>_new</p> Signup and view all the answers

    What does the text provide exercises for in Python's object system?

    <p>Modifying the call function to capture and spread named arguments</p> Signup and view all the answers

    What do methods defined in Python's object system operate on?

    <p>Values stored in the object's dictionary</p> Signup and view all the answers

    What kind of object contains the instructions to print a string in Python?

    <p>Dictionary</p> Signup and view all the answers

    What reduces cognitive load by allowing the people using related things to ignore their differences?

    <p>Inheritance</p> Signup and view all the answers

    What is a specification like 'A generic shape in a drawing package must be able to do' sometimes called?

    <p>Interface</p> Signup and view all the answers

    What is the text's evaluation focused on in Python's object system?

    <p>The understandability and efficiency of modifying the find function</p> Signup and view all the answers

    How can multiple inheritance be understood in Python's object system?

    <p>By understanding it in terms of dictionaries containing references to properties, functions, and other dictionaries</p> Signup and view all the answers

    Study Notes

    Python's Object System: A Dictionary-Based Approach

    • Functions can be stored in data structures like lists and dictionaries, preserving their original names and connections to objects.
    • Objects can be thought of as a special kind of dictionary, and methods as functions that take the object as their first parameter.
    • Implementing objects as dictionaries allows each object to behave slightly differently, but we want them to have the same behaviors and different values.
    • To address this, methods can be stored in a dictionary that corresponds to a class, and individual objects contain a reference to that higher-level dictionary.
    • This allows for reliable identification of objects' classes and checking if two objects are of the same class.
    • Methods defined so far operate on values stored in the object's dictionary and don't take extra arguments as input.
    • Python provides a mechanism called varargs for handling different numbers of arguments and spreading to match a function's parameters.
    • Inheritance can be implemented by creating a dictionary to represent a generic shape and adding a method to calculate density.
    • Constructors are implemented by giving the dictionaries that implement classes a special key _new, whose value is the function that builds something of that type.
    • Multiple inheritance, class methods, static methods, and monkey patching in Python can be understood in terms of dictionaries containing references to properties, functions, and other dictionaries.
    • The text provides exercises for modifying the call function to capture and spread named arguments, implementing multiple inheritance using dictionaries, and adding versions of Python type method and isinstance to dictionary-based objects and classes.
    • The text also discusses modifying the find function to use recursion instead of a loop and evaluates the understandability and efficiency of both versions.

    Python's Object System: A Dictionary-Based Approach

    • Functions can be stored in data structures like lists and dictionaries, preserving their original names and connections to objects.
    • Objects can be thought of as a special kind of dictionary, and methods as functions that take the object as their first parameter.
    • Implementing objects as dictionaries allows each object to behave slightly differently, but we want them to have the same behaviors and different values.
    • To address this, methods can be stored in a dictionary that corresponds to a class, and individual objects contain a reference to that higher-level dictionary.
    • This allows for reliable identification of objects' classes and checking if two objects are of the same class.
    • Methods defined so far operate on values stored in the object's dictionary and don't take extra arguments as input.
    • Python provides a mechanism called varargs for handling different numbers of arguments and spreading to match a function's parameters.
    • Inheritance can be implemented by creating a dictionary to represent a generic shape and adding a method to calculate density.
    • Constructors are implemented by giving the dictionaries that implement classes a special key _new, whose value is the function that builds something of that type.
    • Multiple inheritance, class methods, static methods, and monkey patching in Python can be understood in terms of dictionaries containing references to properties, functions, and other dictionaries.
    • The text provides exercises for modifying the call function to capture and spread named arguments, implementing multiple inheritance using dictionaries, and adding versions of Python type method and isinstance to dictionary-based objects and classes.
    • The text also discusses modifying the find function to use recursion instead of a loop and evaluates the understandability and efficiency of both versions.

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    Description

    Test your understanding of Python's object system with this quiz. Explore the dictionary-based approach for storing functions, implementing objects, handling varargs, inheritance, constructors, and more. Assess your knowledge with exercises on modifying functions and evaluating different implementation methods.

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