Python round 2.5 - Introduction for Programmers

Introduction

Welcome to the introduction of the round function in Python! In this guide, we will explore the round function, its purpose, syntax, and usage. We will also provide some examples to showcase its functionality. Let's get started!

Purpose

The round function in Python is used to round a given number to a specified number of decimal places or to the nearest whole number. It is particularly useful when dealing with floating-point numbers and when precision is required.

Syntax

The syntax of the round function is as follows:

rounded_number = round(number, ndigits)

Here,

• number is the value that needs to be rounded.
• ndigits (optional) is the number of decimal places to which number should be rounded. If ndigits is not provided, it defaults to 0, rounding the number to the nearest whole number.

Usage

The round function can be used in various scenarios, such as:

1. Basic Rounding:

number = 2.5
rounded_number = round(number)
print(rounded_number)  # Output: 2

2. Rounding to Decimal Places:

number = 2.5367
rounded_number = round(number, 2)
print(rounded_number)  # Output: 2.54

3. Rounding Negative Numbers:

number = -4.987
rounded_number = round(number)
print(rounded_number)  # Output: -5

4. Rounding Large Numbers:

number = 9876543210
rounded_number = round(number, -4)
print(rounded_number)  # Output: 9876540000

Conclusion

In conclusion, the round function in Python is a powerful tool for rounding numbers to a specified number of decimal places or to the nearest whole number. It is a handy function to have in your coding toolbox, especially when dealing with floating-point numbers. We hope this guide provided a comprehensive introduction to the round function. Happy coding!

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