← Back to How to's# How to Round in Python?

## What does rounding a number in Python mean?

## Different ways to round a number in Python

### Round to the nearest integer number

### Rounding to a specific decimal place

### Round up

### Round down

## Use cases

## Conclusion

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Round numbers in Python is a very important operation since it is used in almost every field in programming to archive multiple goals. During this article, we will see several methods in python to round numbers such as round up, round down, round to a specific decimal number and round to the nearest integer number. Here is a code snippet that shows how to round a number in Python:

`1number = 3.78 2rounded_number = round(number) 3 4print(rounded_number) # Output: 4`

In the previous example we rounded to the nearest integer number the variable `number`

which value was `3.78`

. The result is the stored in `rounded_number`

and it is printed in the console as `4`

.

This process implies to get a specific float number into the nearest integer number or even to a specific precision of decimals.

Now let’s see some techniques to perform this task:

To round a number to the nearest integer number, we can use the method `round()`

in Python. This function only takes one number as parameter and it returns the number rounded:

`1number = 3.78 2rounded_number = round(number) 3 4print(rounded_number) # Output: 4`

In this example, the `round()`

function rounds the variable number to the nearest integer number which in this case is `4`

.

If we want to round a number to a specific amount of decimals, we can use second parameter in `round()`

called `ndigits`

. This parameter indicates how many decimals we want our number to be include:

`1number = 3.1415 2rounded_number = round (number, 2) 3 4print(rounded_number) # Output: 3.15`

By using the second parameter, we can specify the amount of decimals that the number will include.

To round a number up to the next integer number, you should use the `math.ceil()`

function from the math module built-in in Python.

`1import math 2 3number = 3.78 4rounded_number = math.ceil(number) 5 6print(rounded_number) # Output: 4`

In the code snippet above, we import the module `math`

in order to use the function `ceil()`

which will round the number `3.78`

to `4`

as it is the next integer number.

In this case, we can use `math.floor()`

from the math module.

`1 import math 2 3number = 3.78 4rounded_number = math.floor(number) 5 6print(rounded_number) # Output: 3`

In this code, we import the `math`

module to use the function `floor()`

and round the number `3.78`

to the previous integer number which is `3`

.

Here some common examples where the `round()`

methods is used:

- Financial calculations: When dealing with finances, it is crucial to be concise and accurate with number and amount.
- Data Analysis: When it comes to analyze large datasets, to round numbers might come handy to simplify calculations and highlight trends or patterns.
- Statistics: Rounding numbers will definitely help during this type of analysis where sometimes numbers with decimals can show incorrect data or false positives.
- User interface: To show rounded numbers in front of users can improve their experience and avoid unnecessary complexity.

Finally, rounding numbers in Python is a fundamental operation that provides more options and opportunities when dealing with numbers in programming. Through this article, we analyzed what rounding numbers in Python is, most common methods like rounding up or down, and mentioned some use cases where is pretty common to use round. Using and exercising these skills will improve our code when using the round method in Python.

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