Pandas round() Method – How To Round a Float in Pandas

You can use the Pandas library in Python to manipulate and analyze data. In most cases, it is used for manipulating and analyzing tabular data.

In this article, you'll learn how to use the Pandas round() method to round a float value to a specified number of decimal places.

We'll begin by looking the method's syntax, and then see some practical code applications.

Pandas round() Method Example

Here's what the syntax for the round() method looks like:

DataFrame.round(decimals)

The decimals parameter represents the number of decimal places a number should be rounded to.

The number of decimal places to be returned is passed in as a parameter. round(2) return rounds a number to two decimal places.

Here's an example to demonstrate:

import pandas as pd

data = {'cost':[20.5550, 21.03535, 19.67373, 18.233233]}

df = pd.DataFrame(data)

df['rounded_cost'] = df['cost'].round(2)
print(df)

In the code above, we have a list of numbers that fall under the cost column. The column had these values: [20.5550, 21.03535, 19.67373, 18.233233].

Using the round() method, we rounded the values to 2 decimal places: df['cost'].round(2).

The return values were stored in a column called rounded_cost.

Here's the output of the code:

From the table above, you can see that the values in the cost column have been rounded to 2 decimal places in the rounded_cost columns.

Summary

In this article, we have learned about rounding float values with Pandas using the round() method.

We started looking at the syntax for the round() method looks like. We then saw an example using the method to round float values to a specified number of decimal places.

Happy coding!