Importing specific items in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does it mean to import specific items in Python?

It means you bring only certain functions, classes, or variables from a module into your program instead of importing the whole module.

beginner

How do you import only the <code>sqrt</code> function from the <code>math</code> module?

You write: <br><code>from math import sqrt</code><br>This lets you use <code>sqrt()</code> directly without <code>math.</code> prefix.

beginner

What happens if you try to use a function not imported specifically?

You get an error because Python doesn't know about it unless you import it or the whole module.

beginner

Can you import multiple specific items from a module at once? How?

Yes, by listing them separated by commas: <br><code>from module_name import item1, item2</code>

beginner

Why might you prefer importing specific items instead of the whole module?

It keeps your program clean and can save memory by only loading what you need.

Which syntax correctly imports the choice function from the random module?

A import choice from random

B import random.choice

C from random import choice

D from choice import random

The correct syntax is from random import choice to import a specific function.

What will happen if you write import math and then call sqrt(9)?

A It works and returns 3

B Error: <code>sqrt</code> is not defined

C Imports <code>sqrt</code> automatically

D Returns 9

You must use math.sqrt(9) or import sqrt specifically; otherwise, sqrt alone is undefined.

How do you import both sin and cos from the math module?

A from math import sin, cos

B import math.sin, math.cos

C from math import sin cos

D import sin, cos from math

Use commas to separate multiple items: from math import sin, cos.

What is a benefit of importing specific items instead of the whole module?

A Faster program startup and less memory use

B You get all module features automatically

C You can use any function without import

D No difference at all

Importing only what you need can make your program start faster and use less memory.

Which of these is NOT a correct way to import the datetime class from the datetime module?

A from datetime import datetime

B from datetime import date

C import datetime

D import datetime.datetime

You cannot import like import datetime.datetime. Use from datetime import datetime or import datetime.

Explain how to import specific functions from a Python module and why it might be useful.

Think about how you bring only what you need from a toolbox.

Describe what happens if you try to use a function from a module without importing it specifically or importing the whole module.

Imagine trying to use a tool you never took out of the box.