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AP Computer Science: Unit 4 Questions with Verified Solutions How can you implement a "recursive function" to solve a problem? You implement a recursive function by having it call itself with modified arguments, typically including a base case to terminate the recursion. What is the role...

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AP Computer Science: Unit 4 Questions
with Verified Solutions
How can you implement a "recursive function" to solve a problem?


✔✔You implement a recursive function by having it call itself with modified arguments,

typically including a base case to terminate the recursion.




What is the role of the `__init__` method in a class?


✔✔The `__init__` method initializes an object’s attributes when the object is created, acting as a

constructor in a class.




How does "inheritance" work in object-oriented programming?


✔✔Inheritance allows a class (subclass) to inherit attributes and methods from another class

(superclass), promoting code reuse and hierarchical organization.




What is the difference between "public" and "private" attributes in a class?


✔✔Public attributes are accessible from outside the class, while private attributes are intended to

be used only within the class, often prefixed with an underscore.




1

,How can you use a "decorator" to modify the behavior of a function?


✔✔A decorator is a function that takes another function as input and extends or modifies its

behavior without changing its code directly.




What is a "lambda function," and how does it differ from a regular function?


✔✔A lambda function is a small, anonymous function defined with the `lambda` keyword, used

for simple operations, while regular functions are defined with `def` and can be more complex.




How does "dynamic typing" affect variables in Python?


✔✔Dynamic typing allows variables to change types at runtime, meaning a variable can be

reassigned to a different type of value during execution.




What is the purpose of the `enumerate()` function in Python?


✔✔The `enumerate()` function adds a counter to an iterable and returns it as an `enumerate`

object, useful for iterating with both index and value.




How can you use the `filter()` function to process a list?


✔✔The `filter()` function applies a filtering function to each element of a list, returning only the

elements that satisfy a specified condition.

2

, What is a "dictionary" in programming, and how is it used?


✔✔A dictionary is a data structure that stores key-value pairs, allowing for efficient retrieval of

values based on their associated keys.




How can you retrieve a value from a dictionary using its key?


✔✔You can retrieve a value from a dictionary using the key in square brackets, like

`dictionary[key]`.




What is the purpose of the `pop()` method in a dictionary?


✔✔The `pop()` method removes and returns the value associated with a specified key, allowing

you to both retrieve and delete items.




How can you merge two dictionaries into one?


✔✔You can merge two dictionaries using the `update()` method or by using the `{**dict1,

**dict2}` syntax in Python.




What is the difference between a "set" and a "list" in Python?




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