Comprehensions & generators

def convert_numbers(data):
    """Convert a list of mixed values into integers using a comprehension."""
    return [int(item) for item in data if item is not None]


def double_even_numbers(numbers):
    """Double only even numbers using a generator expression."""
    return (n * 2 for n in numbers if n % 2 == 0)


d…

# Data generation helpers using comprehensions and generators
from itertools import islice


def fibonacci(limit):
    """Generate Fibonacci numbers up to a limit."""
    a, b = 0, 1
    while a <= limit:
        yield a
        a, b = b, a + b


def main():
    # List comprehension: squares of even numbers
    square…

def parse_data_helper(raw_records):
    """Extract active users' names and scores from raw records."""
    parsed = (
        (record["name"], record["score"])
        for record in raw_records
        if record["active"] and record["score"] >= 0
    )
    return list(parsed)


def aggregate_scores(parsed_data):
    "…

def demonstrate_comprehensions_generators():
    # List comprehension: transform and filter in one line
    numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
    squares = [num ** 2 for num in numbers if num % 2 == 0]
    print(f"Square of even numbers (list comprehension): {squares}")

    # Set comprehension: unique values
…

# Demonstrates list comprehensions, dict comprehensions, set comprehensions, and generators

def demonstrate_comprehensions():
    # List comprehension: squares of even numbers
    numbers = range(1, 11)
    even_squares = [n ** 2 for n in numbers if n % 2 == 0]
    
    # Dict comprehension: number to its factorial
 …

# Basic comprehensions and generators demo

# List comprehension: squares of evens
squares = [x * x for x in range(10) if x % 2 == 0]
print("List comp:", squares)

# Dictionary comprehension: char -> count
text = "hello"
char_counts = {c: text.count(c) for c in set(text)}
print("Dict comp:", char_counts)

# Set compre…