Pandas Series - round() function

The Pandas Series round() function rounds each value in a Series to the given number of decimal places. The syntax for using this function is mentioned below:

Syntax

Series.round(decimals=0)

Parameters

decimals Optional. Specify int to indicate number of decimal places to round to. If decimals is negative, it specifies the number of positions to the left of the decimal point.

Return Value

Returns rounded values of the Series.

Example: Rounding a Series

In the example below, the round() function is used to round a Series to a specified number of decimal places.

import pandas as pd
import numpy as np

x = pd.Series([5.344, 3.925, 2.150, 4.229])

print("The Series contains:")
print(x)

#rounding to 0 decimal places
print("\nx.round() returns:")
print(x.round())

#rounding to 1 decimal places
print("\nx.round(2) returns:")
print(x.round(2))

The output of the above code will be:

The Series contains:
0    5.344
1    3.925
2    2.150
3    4.229
dtype: float64

x.round() returns:
0    5.0
1    4.0
2    2.0
3    4.0
dtype: float64

x.round(2) returns:
0    5.34
1    3.92
2    2.15
3    4.23
dtype: float64

Example: Rounding selected series in a DataFrame

Similarly, the round() function can be applied on selected series/column of a given DataFrame. Consider the following example.

import pandas as pd
import numpy as np

df = pd.DataFrame({
  "Bonus": [5.344, 3.925, 2.150, 4.229],
  "Salary": [60.227, 62.550, 65.725, 59.328],
  "Other perks":[2.227, 1.750, 2.527, 2.958]},
  index= ["John", "Marry", "Sam", "Jo"]
)

print("The DataFrame is:")
print(df, "\n")

#rounding 'Salary' series
print("\ndf['Salary'].round(2) returns:")
print(df["Salary"].round(2))

The output of the above code will be:

The DataFrame is:
       Bonus  Salary  Other perks
John   5.344  60.227        2.227
Marry  3.925  62.550        1.750
Sam    2.150  65.725        2.527
Jo     4.229  59.328        2.958 


df['Salary'].round(2) returns:
John     60.23
Marry    62.55
Sam      65.72
Jo       59.33
Name: Salary, dtype: float64

❮ Pandas Series - Functions