Round Numbers

Part of the Logic & Flow section of Coddy's Python journey — lesson 5 of 78.

The round() function rounds numbers to the nearest value.

round(number, ndigits)

number: The value to round.
ndigits: Decimal places to keep (optional).

Examples:

print(round(4.567))     # 5
print(round(4.567, 2))  # 4.57
print(round(456.78, -1))  # 460.0

Python rounds halfway cases to the nearest even number (banker's rounding):

print(round(2.5))  # 2  (rounds DOWN to even 2)
print(round(3.5))  # 4  (rounds UP to even 4)

Challenge

Easy

Write a program that takes two separate inputs from the user and outputs the rounded result:

1. The first input should be a number (float). 2. The second input should be the number of decimal places to round to (integer).

Example:
If the inputs are 3.14159 and 2, the program should output 3.14.

Try it yourself

# Take a float input from the user
# Take an integer input from the user for the number of decimal places
# Print the rounded number

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Logic & Flow

1Variables Exploration

Constants Multiple Variable Assignments Swapping Variables Placeholder VariablesRound NumbersList Casting

4Contact Book Application

Display Menu Add Contact

7Sets Part 2

Mathematical Operations Part 1 Mathematical Operations Part 2 Recap - Treasure Hunt Subsets and Supersets Iterating Over Sets Recap - Tournament Tracker

10Basic List Comprehensions

The Syntax Creating Simple Lists Adding Conditions Using Data Aggregation Recap - House Of Lists Recap - Elements Of Freedom

13Inventory Management System

Project Overview Add Item

Update Stock

Check Availability

Generate Report

2Dictionaries Part 1

What is a Dictionary?Creating a Dictionary Accessing Values Modifying Dictionaries Recap - Recipe Manager

5Advanced Decision Making

Ternary Operator Membership Checks Identity Checks Indentation Errors Recap - Vacation Filter

8Student Records Manager

Project Overview Add Student

11Advanced Functions

Returning Multiple Values Lambda Functions Part 1 Lambda Functions Part 2 Recap Challenge - Lambda Sort Recursive Functions Part 1 Recursive Functions Part 2 Recap - Sum Nested List

14Higher-Order Functions

The Map Function The Filter Function Recap - Email Validator Recap - Number Processor

3Dictionaries Part 2

Dictionary Methods Nested Dictionaries Checking for Keys Looping Through Dictionaries Recap - Frequency Counter

6Sets Part 1

What is a Set?Basic Operations Set Methods Recap - Remove Duplicates

9Advanced Data Aggregation

Using Sum Finding Minimum and Maximum Sorting Data Efficiently Recap - Dictionary Sorter

12Basic Error Handling

What is Error Handling?The Try and Except Block Handling Multiple Exceptions Recap - Shopping Cart Errors

15Final Challenges

Smart Contact Manager Word Analytics Data Transformer