Python Functions and Recursion Quiz

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Questions and Answers

What is the purpose of the function `randint(a, b)` in the random module?

To create a list of random items

To calculate the length of a list

To generate a random integer between a and b inclusive (correct)

To sort a list of integers

A `ZeroDivisionError` occurs when a division by zero is attempted in a program.

True

What do you call the variables defined within a function's body?

local variables

When writing your own module, you need to create a new ._________ file containing functions and values.

py Signup and view all the answers

Match the following exceptions with their descriptions:

ZeroDivisionError = Occurs when a division by zero is attempted ImportError = Raised when there's an error importing a module IndexError = Triggered by trying to access an out-of-range index in a list SyntaxError = Occurs when the code cannot be parsed properly Signup and view all the answers

What technique involves a function calling itself?

Recursion Signup and view all the answers

A for-loop is essential for implementing recursion.

False Signup and view all the answers

In Python, a collection of code files with functions and values is called a ______.

module Signup and view all the answers

Match the following keywords with their function in Python modules:

import = To include a module in your code from = To import specific objects from a module as = To assign a different name to an imported module <ul> <li>(asterisk) = To import all objects from a module</li> </ul> Signup and view all the answers

Which statement is true regarding global and local variables?

Global variables can be accessed inside a function. Signup and view all the answers

It is encouraged to use * to import all objects from a module.

False Signup and view all the answers

`def rec_sum(a_list):`
`if a_list == [] :`
`return 0`
`else:`
`return a_list[0] + rec_sum(a_list[1:])`

A function that sums the items in a list is utilizing ______.

recursion Signup and view all the answers

What must you do before calling a function in Python?

Define the function Signup and view all the answers

A variable defined inside a function can be accessed from outside that function.

False Signup and view all the answers

What do modules in Python primarily refer to?

A file containing Python statements and definitions Signup and view all the answers

What is the purpose of using the keyword 'global' in a function?

To access a global variable within the function. Signup and view all the answers

A function that does not take any arguments is called a function with _____ arguments.

zero Signup and view all the answers

Modules are imported using the command `load module_name`.

False Signup and view all the answers

What is the output of the following code: `print(2 + 2)`?

4 Signup and view all the answers

Which of the following statements about local and global variables is true?

Local variables can only be accessed within the function where they are defined. Signup and view all the answers

What is a key benefit of defining functions in Python?

Code reuse and easier maintenance. Signup and view all the answers

___ refer to a collection of functions and definitions in Python.

Modules Signup and view all the answers

Match the following Python components with their descriptions:

Function = A reusable piece of code Module = A file containing Python code Exception = An error that occurs during execution Statement = An instruction that Python can execute Signup and view all the answers

Match the following terms with their definitions:

Local Variable = A variable defined inside a function. Global Variable = A variable defined outside of all functions. Function Argument = A value passed to a function. Built-in Function = A function provided by Python by default. Signup and view all the answers

Which of the following statements about functions is false?

Functions must have a variable number of arguments. Signup and view all the answers

The syntax to define a function in Python starts with the keyword _____ followed by the function name.

def Signup and view all the answers

An exception in Python refers to a standard function.

False Signup and view all the answers

What is the purpose of using modules in Python?

To organize and encapsulate code for reuse and maintainability. Signup and view all the answers

Study Notes

Function Motivation

Defining your own functions promotes code reusability
Easier to maintain large codebases

Defining a Function

Use "def" keyword followed by function name and parenthesized arguments
Indented statement block follows the definition

Zero, One or More Arguments

Functions can have zero arguments
Functions can have more than one argument
Arguments can be of different data types

Local vs Global Variables

Variables declared inside a function are local
Local variables cannot be accessed outside the function
Global variables are defined outside of functions
Variables assigned values inside a function are local by default
"global" keyword allows access to a global variable inside a function

Quiz 1

Output: c) 42 17 17 4 1 15 3 4

Recursion

A function calling itsef to solve a task
Example: calculate the sum of items in a list without a for-loop
Use a "base case" to stop recursive calls
"Recursive case" handles the rest of the task

Modules

Modules are pieces of code saved in .py files containing functions and values
Used for common tasks
Import modules using "import module_name"
Access module functions and values using "module_name.var"
Import specific functions using "from module_name import var"

Quiz 3

Output: c) An error occurs

Modules: Three Types

Preinstalled modules: accessible in the Python Standard Library
Self-written modules: create a .py file with the module name, import using the file name without extension
Third-party modules: installed by third-party sources, install using PIP

Examples

Generate a list of n random integers between 0 and 10
Create a function "random_list" that takes n as input and returns a list of n random integers

Exceptions

Occur when code encounters issues
Can be caused by incorrect code or input
Without exception handling, program terminates
Different exceptions are raised for different reasons
Common exceptions include ZeroDivisionError, ImportError, IndexError, NameError, SyntaxError

Quiz 2

Output: 3. 4 is maximum

Quiz 4

Output: Answers: Error message because variables c and d are not visible to the function mean() 35 35 4.0 53 53 4.0

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Description

Test your understanding of defining functions, argument types, and variable scopes in Python. This quiz also covers key concepts related to recursion, such as base and recursive cases. Get ready to assess your knowledge of these fundamental programming concepts!

Python Functions and Recursion Quiz

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Questions and Answers

What is the purpose of the function randint(a, b) in the random module?

A ZeroDivisionError occurs when a division by zero is attempted in a program.

What do you call the variables defined within a function's body?

When writing your own module, you need to create a new ._________ file containing functions and values.

Match the following exceptions with their descriptions:

What technique involves a function calling itself?

A for-loop is essential for implementing recursion.

In Python, a collection of code files with functions and values is called a ______.

Match the following keywords with their function in Python modules:

Which statement is true regarding global and local variables?

It is encouraged to use * to import all objects from a module.

def rec_sum(a_list): if a_list == [] : return 0 else: return a_list[0] + rec_sum(a_list[1:]) A function that sums the items in a list is utilizing ______.

What must you do before calling a function in Python?

A variable defined inside a function can be accessed from outside that function.

What do modules in Python primarily refer to?

What is the purpose of using the keyword 'global' in a function?

A function that does not take any arguments is called a function with _____ arguments.

Modules are imported using the command load module_name.

What is the output of the following code: print(2 + 2)?

Which of the following statements about local and global variables is true?

What is a key benefit of defining functions in Python?

___ refer to a collection of functions and definitions in Python.

Match the following Python components with their descriptions:

Match the following terms with their definitions:

Which of the following statements about functions is false?

The syntax to define a function in Python starts with the keyword _____ followed by the function name.

An exception in Python refers to a standard function.

What is the purpose of using modules in Python?

Study Notes

Function Motivation

Defining a Function

Zero, One or More Arguments

Local vs Global Variables

Quiz 1

Recursion

Modules

Quiz 3

Modules: Three Types

Examples

Exceptions

Quiz 2

Quiz 4

Studying That Suits You

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What is the purpose of the function `randint(a, b)` in the random module?

A `ZeroDivisionError` occurs when a division by zero is attempted in a program.

`def rec_sum(a_list):`
`if a_list == [] :`
`return 0`
`else:`
`return a_list[0] + rec_sum(a_list[1:])`

A function that sums the items in a list is utilizing ______.

Modules are imported using the command `load module_name`.

What is the output of the following code: `print(2 + 2)`?