← Python

More Arithmetic

// performs integer (floor) division, % returns the remainder, and ** raises a number to a power

What it does: After importing math, you access its contents with math.pi or math.sqrt(). random.randint(1, 10) returns a random integer from 1 to 10 inclusive. import gives your program access to extra functions in an external module. Convention is to put all imports at the top so they're easy to find. randint includes both endpoints — could return 1, 2, 3, 4, 5, or 6. sleep() pauses program execution for the given number of seconds. Without 'import random', Python doesn't know what 'random' refers to. The dot . separates the module name from the function name.

Common mistakes: Module name is lowercase: import random, not import Random. Must use dot notation random.randint(), not just randint().

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Learning

Duo

What does import do?

Loads a module so you can use itPrints text

Matches

❌ randint(1, 6)

↓

Error: Must import random first

Applying

Meanings

Term

import

Meaning

Keyword that loads a module so you can use its functions.

Practice

import random

Testing

Gaps

random

Check Answer

Spots

1import Random

2low = 1

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Quick Questions

1. What does import do?

A. Loads a module so you can use it ✓

B. Prints text

import gives your program access to extra functions in an external module

2. Where should import go in your code?

A. At the bottom

B. At the top of the file ✓

Convention is to put all imports at the top so they're easy to find

3. What does random.randint(1, 6) return?

A. A random number from 1 to 6 ✓

B. Always 1

randint includes both endpoints — could return 1, 2, 3, 4, 5, or 6

4. What does time.sleep(3) do?

A. Prints 3

B. Pauses for 3 seconds ✓

sleep() pauses program execution for the given number of seconds

5. What happens if you use random.randint() without import?

A. NameError ✓

B. Returns 0

Without 'import random', Python doesn't know what 'random' refers to

Match the Pairs

randint(1, 6) → Error: Must import random first

import Random → Error: Module names are lowercase

import math print(math.pi) → Valid: Access math.pi

import random random.randint(1, 10) → Ok: Random integer 1-10

import math print(math.sqrt(25)) → Output: 5.0

import math print(math.floor(3.9)) → Output: 3

Key Term

import

Keyword that loads a module so you can use its functions.~~Module

Fill in the Blanks

1. import random print(random.randint(1, 10))

2. import random print(random.randint(1, 6))

3. import time time.sleep(2)

4. import random print(random.choice(colors))

5. import time time.sleep(3)

Spot the Error

Question 1

A import Random

B low = 1

C high = 10

D result = Random.randint(low, high)

E print(result)

Line A — Module name is lowercase: import random, not import Random

Question 2

A import random

B low = 1

C high = 10

D result = randint(low, high)

E print(result)

Line D — Must use dot notation random.randint(), not just randint()

Question 3

A import random

B low = 1

C high = 10

D result = random.randint(low)

E print(result)

Line D — randint() needs two arguments: the start and end numbers

Question 4

A import time

B print('Starting...')

C time.sleep('3')

D print('3 seconds later...')

E print('Done!')

Line C — sleep() takes a number, not a string: use 3, not '3'

Question 5

A import random()

B low = 1

C high = 6

D result = random.randint(low, high)

E print('Dice roll:', result)

Line A — Don't use parentheses with import: just import random

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