python dictionary with tuple key
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In Python, dictionaries are versatile data structures that allow you to store and retrieve data using key-value pairs. While dictionary keys are commonly single values (e.g., strings or numbers), Python also supports using tuples as keys. This can be especially useful in scenarios where you need a composite key, i.e., a key that consists of multiple values.
In this tutorial, we'll explore how to use tuples as keys in a Python dictionary with examples and explanations.
A tuple can be used as a key in a dictionary if it is immutable. Since tuples are immutable, they can serve as keys, unlike lists which are mutable and cannot be used as dictionary keys.
In this example, each tuple (('John', 'Doe'), ('Alice', 'Smith'), etc.) serves as a unique key associated with the age of the corresponding employee.
Uniqueness: Tuples allow you to create keys that are unique combinations of values.
Immutability: Since tuples are immutable, once a tuple is used as a key, its values cannot be changed. This ensures the integrity of the key-value association.
Hashability: Tuples are hashable, making them suitable for indexing in dictionaries. This is important because dictionary keys need to be hashable for efficient lookups.
Let's go through the process of creating a dictionary with tuple keys step by step.
Iterating over a dictionary with tuple keys is straightforward. You can use a for loop to access both keys and values.
This loop prints the names and ages of all employees in the dictionary.
Using tuples as keys in Python dictionaries provides a powerful way to represent and manage data with composite keys. This tutorial has covered the basics of working with dictionaries containing tuple keys, including creation, access, and iteration.
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