Hi Python Developers, Throughout this article you will see everything about how to limit decimal places in Python by using some Python built-in functions and modules with the help of proper examples and explanations.

Sometimes in real-life Python applications, we want to perform some calculations to two decimal places, In that scenario, we can use some functions and modules to limit decimal places in Python.

Headings of Contents

## Why do we need to limit decimal places in Python?

Suppose we want to work on a real-life Python application and want to perform some mathematical operations, In that scenario, It might be your calculation produces a long decimal number but you want to only two or three decimal places, At that time you have to use some functions and packages to round float to **2** decimal places or format decimal to **3** decimal places.

### Built-in Functions to Limit Decimal Places in Python

I have listed some Python built-in functions that are used to limit the decimal places in Python.

**round(number, digits):-**The**round()**function is a built-in function in Python that is used to return the rounded version of the passed number with a specified number of digits. It takes two parameter numbers to be rounded and a digit that defines a number of decimal places.**format(value, format):-**It is also a Python built-in function that is used to limit decimal places in Python. It takes two arguments the value and format which you want to use for formatting the passed value.

## Limit Decimal Places in Python using round() and format()

let’s write some Python programs to round the float to 2 decimal places using the **round()** and **format()** functions.

### Example: Round float to 2 decimal places Python

# decimal value decimal_value = 120.7572 # using round() result = round(decimal_value, 2) # displaying print(result)

The Output will be:- **120.76**

In the above example, the round() function returns the rounded version of the passed value.

### Example:- Round float to 2 decimal places Python

# decimal value decimal_value = 45.7572 # using round() result = format(decimal_value, '.2f') # displaying print(result)

The output will be:- **45.76**

Let’s see some other ways in order to round float to 2 decimal places in Python.

# decimal value decimal_value = 45.7572 # using '%' to format the decimal number till 2 decimal places print("Using '%' to format the decimal number till 2 decimal places:- ", end=' ') print('%.2f' % decimal_value) # using format() to format the decimal number to 3 decimal places print("Using format() method to format the decimal number to 3 decimal places:- ", end=' ') print('{0:.3f}'.format(decimal_value)) # using f-string to limit the decimal number to 2 decimal places print("Using f-string method to format the decimal number to 3 decimal places:- ", end=' ') print(f"{decimal_value:0,.2f}")

**Output**

```
Using '%' to format the decimal number till 2 decimal places:- 45.76
Using format() method to format the decimal number to 3 decimal places:- 45.757
Using f-string method to format the decimal number to 3 decimal places:- 45.76
```

In the above example, I have used percent sign ( **%** ), string **format()** functions, and **f-string** in order to set the decimal value to 2 decimal places, As you can see below output.

As you can see in the above examples, the round() and float() functions are returning the rounded version of the passed value.

## How to Limit Decimal Places in Python Using Modules

Python provides some built-in and external packages in order to format the decimal value up to 2 decimal places. Let’s see some of the popular packages along with examples.

### Using Python Numpy:

**Python numpy** is an external most popular and widely used Python package that provides numerous functions and methods in order to work with complex mathematical calculations. It has a method called **round()** and this method is used to round the passed decimal value.

import numpy as np num = 3.4302789 rounded_num = np.round(num, 2) print(rounded_num)

The output will be:- **3.43**

**Note:-** Make sure, Numpy has been installed on your machine, If not then follow the below command to install the Python **numpy** library.

pip install numpy

### Using Python Pandas:

**Python Pandas** is an external library written in Python programming, it is mostly used for data manipulation and data analysis. To use Python pandas, it must be installed on your machine.

**Note:-** Make sure, the Python pandas library has been installed on your machine, If not then follow the below command to install the Python **pandas** library.

pip install pandas

import pandas as pd df = pd.DataFrame({'num': [56.6968798]}) df['rounded_num'] = df['num'].round(3) print(df['rounded_num'][0])

The output will be:- **56.697**

### Using Python decimal Module:

The decimal is a built-in module in Python language that provides various methods and functions to work with decimal values. It is a built-in module, Therefore you don’t need to install it like **numpy** and Pandas.

from decimal import Decimal num = Decimal('3.14159265359') rounded_num = num.quantize(Decimal('.01')) print(rounded_num)

In the above example, I have imported the **Decimal** class from the **decimal** module and created an object of the Decimal class called **num** by passing the decimal value **3.14159265359** as a string.

We then used **quantize()** method of the num object to format the passed decimal values up to 2 decimal places. Remember, It always returns the rounded value of passed decimal values.

### Using Python math Module:

Again, the Python math module is a built-in module, Therefore it does not mandatory to install it by using the pip command. Just import it and start using it.

import math num = 3.75657 rounded_num = math.floor(num * 100) / 100 print(rounded_num)

The output **3.75**

In the above example, I imported the math module using the import keyword and used the **floor()** function of the math module to round down the value of the passed decimal number.

So, This is how you can use packages and modules to round the decimal number to 2 decimal places.

### How to limit decimal places in Python without rounding

Sometimes we want to get exact decimal numbers up to 2 decimal places without doing any rounding. To do that, you can follow the below example.

import math num = 3.76657 rounded_num = math.floor(num * 100) / 100 print(rounded_num)

## Conclusion

In conclusion, We have seen multiple ways to limit decimal places in Python with rounding and without rounding the decimal places. You can use any one of them as per your requirement.

We have seen built-in functions like **round()** and **format()** and external packages like **Pandas**, **Numpy**, **Math**, and **Decimal** along with examples.

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