Contents

A quick tutorial on how to round to 2 decimal places in Python using the built-in round() function.

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## Introduction

The round() function returns a floating point number that is a rounded version of the specified number, with the specified number of decimals.

If no decimal places are specified, the number will be rounded to the nearest integer.

The original number is returned if the specified number of decimals are already present in the number.

## Why Round To 2 Decimal Places In Python?

Python has a built in round function that takes two arguments, the first is the number to round and the second is the number of decimal places to round to. If you want to round to 2 decimal places, you would use this function like so:

x = 1.23456

y = round(x, 2)

# y now equals 1.23

## How To Round To 2 Decimal Places In Python?

In Python, you can use the built-in round() function to round a float to the specified number of decimal places. Simply pass the number you want to round as the first argument, and the number of decimal places to round it off to as the second argument.

For example, if you want to round the number 3.14159265359 to 2 decimal places, you would do so like this:

round(3.14159265359, 2)

This would give you the result 3.14.

If you want to round off a float to an integer (i.e., get rid of all the decimal places), you can use the int() function for this. For example, int(3.14159265359) would give you 3.

You can also use Python’s string formatting syntax tothis effect. For example, if you wanted to round off the number 3.14159265359 to 2 decimal places and print it out as a string, you could do so like this:

f”{3.14159265359: .2f}”

# prints “3.14”

## Using The round() Function

The round() function returns a floating point number that is a rounded version of the specified number, with the specified number of decimals.

If no decimal places are specified, the string is returned unchanged.

If you want to round to 2 decimal places, you have to pass 2 as the value of the second argument.

For example, if we have a float like 10.1234 and we want to round it to 2 decimal places, then we can use the round function like this:

## Using Decimal Module

Python’s decimal module provides support for fast correctly-rounded floating-point arithmetic. It offers several advantages over the float datatype:

– Decimal “is based on a floating-point model which was designed with people in mind, and necessarily has a paramount guiding principle – computers must provide an arithmetic that works in the same way as the arithmetic that people learn at school.” In other words, it is designed to mimic how we humans think about and perform mathematical operations on numbers.

– Decimal avoids floating point rounding errors often seen when working with floats, by using a fixed number of decimal places instead of a variable number.

– Decimal can represent numbers exactly (such as 1/3), whereas binary floats cannot. This is useful for financial applications, or any others where precise rounding is required.

## Using Format() Function

You can use the format() function to round a number to a certain number of decimal places. You can also use it to add spaces or other characters before or after the number.

To round a number to 2 decimal places, you can use the format() function with the round() function. The following example rounds a number to 2 decimal places.

>>> num = 1.2345

>>> print(format(num, ‘0.2f’))

1.23

## Using Numpy

Python doesn’t have a built in round to 2 decimal places function, but we can get around this by importing the numpy library.

Numpy is a library for scientific computing in Python. It contains a lot of useful functions, and one of these is the ability to round numbers to a specified number of decimal places.

To use this function, we first need to import numpy into our program:

“`

import numpy as np

“`

We can then use the np.round() function to round numbers to a specified number of decimal places. The syntax for this function is:

“`

np.round(number,decimals)

“`

where “number” is the number that you want to round, and “decimals” is the number of decimal places that you want to round it to.

Let’s try an example. Say we have the following number:

“`

x = 3.141592654

“`

If we wanted to round this number down to 2 decimal places, we would use the following code:

## Conclusion

In Python, you can use the built-in round() function to round a floating-point number to its nearest integer. However, if you need to round a number to its nearest 2 decimal places, you need to use the custom round() function.

Here’s the syntax of the custom round() function:

def round(number,decimals):

return ____

As you can see, the custom round() function takes 2 arguments:

-The number that you want to round. This can be an integer or a floating-point number.

-The number of decimal places that you want to round to. This must be an integer.

## References

Round to 2 decimal places in Python:

In [1]: x = 1.2345678

In [2]: print(round(x, 2))

1.23