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Comprehensions & generators

List/dict/set comprehensions, generator expressions, and lazy iteration.

3 matches

Count Data in Python with Comprehensions and Generators

Count list items with a dict comprehension and generate squares lazily with a generator expression, printing both results.

comprehensions generators counter

Python

from collections import Counter

data = ["apple", "banana", "apple", "cherry", "banana", "apple"]

counts = {item: data.count(item) for item in set(data)}

square_gen = (x * x for x in range(5))
squares = list(square_gen)

if __name__ == "__main__":
    print("Manual count:", counts)
    print("Counter:", dict(Counter…

15 0 Open

Comprehensions & generators easy

How to Use Comprehensions and Generators to Check Data in Python

A beginner-friendly helper that filters numeric values, computes squares and cubes with comprehensions and a generator, and returns a summary dictionary.

comprehensions generators data-checking

Python

def check_data(iterable):
    """Return a summary of numeric data using comprehensions and a generator."""
    values = [item for item in iterable if isinstance(item, (int, float))]
    squares = [x ** 2 for x in values if x > 0]
    cubes = (x ** 3 for x in values if x > 0)
    cube_list = list(cubes)
    return {
  …

13 0 Open

Comprehensions & generators easy

Sum of Squares with a Generator Expression in Python

This code computes the sum of squares of integers from 1 to n using a generator expression, demonstrating a memory-efficient and concise way to aggregate a sequence.

generator sum squares

Python

def sum_of_squares(n):
    return sum(x * x for x in range(1, n + 1))

if __name__ == "__main__":
    print(f"Sum of squares from 1 to 5: {sum_of_squares(5)}")
    print(f"Sum of squares from 1 to 10: {sum_of_squares(10)}")

14 0 Open

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