Web Reference: Jul 11, 2025 · Let's discuss a few ways to invert mapping of a dictionary. Method #1: Using Dictionary Comprehension. Time complexity: O (n), where n is the number of key-value pairs in the dictionary. Auxiliary space: O (n), to store the keys and values in dictionary. Method #2: Using dict.keys () and dict.values () Method #3: Using map () and reversed. The solution is to loop over the start dictionary keys and value, and add them in reverse order to a new dictionary. Example of reversing an english-to-spanish dictionary: Dec 1, 2025 · In this guide, we’ll explore how to invert a Python dictionary with multiple values per key, covering common challenges, step-by-step methods, edge cases, and best practices.
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