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Python Pandas - Sort index values and also return the indices that would sort the index
To sort index values and also return the indices that would sort the index, use the index.sort_values(). The return_indexer parameter is set to be True.
At first, import the required libraries −
import pandas as pd
Creating Pandas index −
index = pd.Index([50, 10, 70, 95, 110, 90, 30])
Display the Pandas index −
print("Pandas Index...\n",index)
Sort index values. By default, sorts in Ascending order. Return the indices to sort the index using the "return_indexer" parameter with value True −
print("\nSort and also return the indices that would sort the index...\n",index.sort_values(return_indexer=True))
Example
Following is the code −
import pandas as pd # Creating Pandas index index = pd.Index([50, 10, 70, 95, 110, 90, 30]) # Display the Pandas index print("Pandas Index...\n",index) # Return the number of elements in the Index print("\nNumber of elements in the index...\n",index.size) # Sort index values # By default, sorts in Ascending order # Return the indices to sort the index using the "return_indexer" parameter with value True print("\nSort and also return the indices that would sort the index...\n",index.sort_values(return_indexer=True))
Output
This will produce the following output −
Pandas Index... Int64Index([50, 10, 70, 95, 110, 90, 30], dtype='int64') Number of elements in the index... 7 Sort and also return the indices that would sort the index... (Int64Index([10, 30, 50, 70, 90, 95, 110], dtype='int64'), array([1, 6, 0, 2, 5, 3, 4], dtype=int64))
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