Dictionary Comprehension

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Dictionary Comprehension

Dictionary Comprehension is a concise and elegant way to create dictionaries in Python. It allows you to create a new dictionary by writing key-value pairs in a single line using a loop or conditional logic. This approach is shorter and often more readable than using traditional for loops.

Syntax:

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{key: value for item in iterable}

You can also add conditions:

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{key: value for item in iterable if condition}

Example 1 – Simple Dictionary Comprehension:

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squares = {x: x**2 for x in range(5)}

# Output: {0: 0, 1: 1, 2: 4, 3: 9, 4: 16}

Example 2 – With Condition:

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even_squares = {x: x**2 for x in range(10) if x % 2 == 0}

# Output: {0: 0, 2: 4, 4: 16, 6: 36, 8: 64}

Example 3 – Using Strings:

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word_lengths = {word: len(word) for word in ['apple', 'banana', 'kiwi']}

# Output: {'apple': 5, 'banana': 6, 'kiwi': 4}

Benefits:

Cleaner and shorter code

Easier to read and maintain

Supports filtering with conditions

Dictionary comprehension is especially useful when transforming data, counting items, or building mappings from lists or tuples. It improves code performance and structure in many scenarios.

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Dictionaries

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