abs() and round() in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the abs() function do in Python?

The abs() function returns the absolute value of a number, which means it removes any negative sign and gives the distance from zero.

beginner

How does the round() function work in Python?

The round() function rounds a floating-point number to the nearest whole number or to a specified number of decimal places.

beginner

What will abs(-7.5) return?

It will return 7.5 because abs() removes the negative sign and returns the positive value.

beginner

What is the result of round(3.14159, 2)?

It returns 3.14 because it rounds the number to 2 decimal places.

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Can round() be used without specifying decimal places? What happens then?

Yes, if you use round() without the second argument, it rounds the number to the nearest whole number (integer).

What does abs(-10) return?

A 10

B -10

C 0

D -1

abs() returns the positive value of the number, so abs(-10) is 10.

What is the output of round(4.678)?

A 4.68

B 5

C 4.7

D 4

Without specifying decimal places, round() rounds to the nearest whole number. Since 4.678 is closer to 5, it returns 5.

Which function would you use to get the positive value of a number?

A abs()

B round()

C int()

D float()

abs() returns the absolute (positive) value of a number.

What does round(2.345, 1) return?

A 2.3

B 2.4

C 2.34

D 3

It rounds to 1 decimal place. The hundredths digit is 4 (<5), but the thousandths digit is 5, so it rounds up to 2.4.

If you want to round a number to zero decimal places, what should you do?

A Use round(number)

B Use abs(number)

C Use round(number, 0)

D Use int(number)

Using round(number) or round(number, 0) rounds the number to zero decimal places (nearest whole number). Note that round(number) returns an int, while round(number, 0) returns a float.

Explain how the abs() function works and give an example.

Think about how distance from zero is always positive.

Describe how to use the round() function to round a number to 3 decimal places.

Remember the second number tells how many digits after the dot you want.