Python | Pandas Index.is_unique Last Updated : 20 Feb, 2019 Comments Improve Suggest changes Like Article Like Report Pandas Index is an immutable ndarray implementing an ordered, sliceable set. It is the basic object which stores the axis labels for all pandas objects. Pandas Index.is_unique attribute return True if the underlying data in the given Index object is unique else it return False. Syntax: Index.is_unique Parameter : None Returns : boolean Example #1: Use Index.is_unique attribute to find out if the underlying data in the given Index object is unique or not. Python3 # importing pandas as pd import pandas as pd # Creating the index idx = pd.Index(['Melbourne', 'Sanghai', 'Lisbon', 'Doha', 'Moscow']) # Print the index print(idx) Output : Now we will use Index.is_unique attribute to find out if the underlying data in the given Index object is unique or not. Python3 1== # check if the values in the Index # is unique or not. result = idx.is_unique # Print the result print(result) Output : As we can see in the output, the Index.is_unique attribute has returned True indicating that the underlying data of the given Index object is unique. Example #2 : Use Index.is_unique attribute to find out if the underlying data in the given Index object is unique or not. Python3 # importing pandas as pd import pandas as pd # Creating the index idx = pd.Index([900, 700, 620, 388, 900]) # Print the index print(idx) Output : Now we will use Index.is_unique attribute to find out if the underlying data in the given Index object is unique or not. Python3 1== # check if the values in the Index # is unique or not. result = idx.is_unique # Print the result print(result) Output : As we can see in the output, the Index.is_unique attribute has returned False indicating that the underlying data of the given Index object is not unique. 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