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Validating the existence of duplicates

A reader asked us the following question:

should the code on line 214 search for a match in dup_values.keys that store the data of nodes, which is made clear on line 220?

This is Alina from Educative.

Yes, the code on line 214 searches for a match in the keys of the dup_values where the keys are the values stored in the linked list.

Additionally, there are many ways to search for a key in a dictionary in Python. We have used in to test for the existence of a key in a dictionary. Our current code looks like this:

if cur.data in dup_values:

but the following statement is also correct:

if cur.data in dup_values.keys():

Both the statements specified above are valid for testing the existence of a key in a dictionary. Furthermore, there are also other ways, for example, the get() method for dictionaries in Python which you may also use to test for the existence of a key in a dictionary.

Best Regards,
Alina Fatima | Developer Advocate
Educative.io

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