Python | Pandas Series.set_axis()

Pandas series is a One-dimensional ndarray with axis labels. The labels need not be unique but must be a hashable type. The object supports both integer- and label-based indexing and provides a host of methods for performing operations involving the index.

Pandas Series.set_axis() function is used to assign desired index to given axis. Indexes for column or row labels can be changed by assigning a list-like or Index.

Syntax: Series.set_axis(labels, axis=0, inplace=None)
Parameter : 
labels : The values for the new index. 
axis : The axis to update. The value 0 identifies the rows, and 1 identifies the columns. 
inplace : Whether to return a new %(klass)s instance.
Returns : renamed : series 

Example #1: Use Series.set_axis() function to reset the axis of the given Series object. 

Python3

# importing pandas as pd
import pandas as pd

# Creating the Series
sr = pd.Series(['New York', 'Chicago', 'Toronto', 'Lisbon', 'Rio', 'Moscow'])

# Create the Index
index_ = ['City 1', 'City 2', 'City 3', 'City 4', 'City 5', 'City 6']

# set the index
sr.index = index_

# Print the series
print(sr)

Output : 

Now we will use Series.set_axis() function to reset the index of the given series object 

Python3

# Create the Index
didx = pd.DatetimeIndex(start ='2014-08-01 10:00', freq ='W',
                     periods = 6, tz = 'Europe/Berlin')


# reset the index
sr.set_axis(didx, inplace = True)

# Print the series
print(sr)

Output : 

As we can see in the output, the Series.set_axis() function has successfully reset the index of the given Series object.

Example #2: Use Series.set_axis() function to reset the axis of the given Series object. 

Python3

# importing pandas as pd
import pandas as pd

# Creating the Series
sr = pd.Series([100, 25, 32, 118, 24, 65])

# Print the series
print(sr)

Output : 

Now we will use Series.set_axis() function to reset the index of the given series object 

Python3

# Assign the new index
sr.set_axis(['A', 'B', 'C', 'D', 'E', 'F'], inplace = True)

# print the series
print(sr)

Output : 

As we can see in the output, the Series.set_axis() function has successfully reset the index of the given Series object.