Python入門ガイド: 内包表記の使い方と応用例【どこよりも詳しく解説！！】

numbers = [ 1, 2, 3, 4, 5]

numbers = list(range(1, 6))

even_numbers = [x for x in range(1, 11) if x % 2 == 0]

x = []
for 計算で使用する変数 in 反復可能オブジェクト:
    x.append(リストの要素を計算する式)

numbers = [ 1, 2, 3, 4, 5]

squared_numbers = [num ** 2 for num in numbers]
print(squared_numbers)

fruits = ['apple', 'banana', 'orange']
capitalized_fruits = [fruit.upper() for fruit in fruits]
print(capitalized_fruits)

numbers = [ 1, 2, 3, 4, 5 ]
even_numbers = [num for num in numbers if num % 2 == 0]
print(even_numbers)

fruits = ['apple', 'banana', 'orange', 'kiwi', 'pear']
starts_with_a = [fruit for fruit in fruits if fruit.startswith('a')]
print(starts_with_a)

matrix = [[ 1, 2, 3], [4, 5, 6], [7, 8, 9]]
flattened = [num for sublist in matrix for num in sublist]
print(flattened)

matrix = [[ 1, 2, 3], [4, 5, 6], [7, 8, 9]]
sum_of_elements = sum([num for sublist in matrix for num in sublist])
print(sum_of_elements)

prices = {'apple': 0.99, 'banana': 0.25, 'orange': 0.50, 'kiwi': 1.25, 'pear': 0.75}
discounted_prices = {item: price * 0.8 for item, price in prices.items()}
print(discounted_prices)

matrix = [[ 1, 2, 3], [4, 5, 6], [7, 8, 9]]
filtered_matrix = [[num for num in sublist if num % 2 == 0] for sublist in matrix]
print(filtered_matrix)

class Car:
    def __init__(self, brand, color, price):
        self.brand = brand
        self.color = color
        self.price = price

# 車両リストの作成
cars = [
    Car('Toyota', 'Red', 20000),
    Car('Honda', 'Blue', 25000),
    Car('Ford', 'Black', 30000),
    Car('Toyota', 'White', 18000),
    Car('BMW', 'Black', 50000)
]

# 内包表記を使って特定の条件に合致する車両のみを抽出する
filtered_cars = [car for car in cars if car.brand == 'Toyota' and car.price <= 25000]

# 結果の表示
for car in filtered_cars:
    print(f"Brand: {car.brand}, Color: {car.color}, Price: {car.price}")

import argparse

def parse_arguments():
    parser = argparse.ArgumentParser(description='Calculate absolute values of numbers')
    parser.add_argument('numbers', metavar='N', type=int, nargs='+', help='List of numbers')
    return parser.parse_args()

def calculate_absolute_values(numbers):
    absolute_values = [abs(num) for num in numbers]
    return absolute_values

def main():
    args = parse_arguments()
    numbers = args.numbers
    absolute_values = calculate_absolute_values(numbers)
    print(absolute_values)

if __name__ == '__main__':
    main()

$ python absolute_values.py 5 -2 3 -1 0
[5, 2, 3, 1, 0]

import random

choices = ['rock', 'paper', 'scissors']
winning_conditions = [('rock', 'scissors'), ('paper', 'rock'), ('scissors', 'paper')]

user_choice = input("Your choice: ")
computer_choice = random.choice(choices)

result = "Draw" if user_choice == computer_choice else "You win!" if any(user_choice == w[0] and computer_choice == w for w in winning_conditions) else "Computer wins!"

print(f"Your choice: {user_choice}")
print(f"Computer's choice: {computer_choice}")
print(result)

import random
import argparse

def parse_arguments():
    parser = argparse.ArgumentParser(description='Rock-Paper-Scissors game')
    parser.add_argument('choice', choices=['rock', 'paper', 'scissors'], help='Your choice: rock, paper, or scissors')
    return parser.parse_args()

def generate_computer_choice():
    choices = ['rock', 'paper', 'scissors']
    computer_choice = random.choice(choices)
    return computer_choice

def determine_winner(user_choice, computer_choice):
    winning_conditions = [('rock', 'scissors'), ('paper', 'rock'), ('scissors', 'paper')]
    if user_choice == computer_choice:
        return 'Draw'
    elif (user_choice, computer_choice) in winning_conditions:
        return 'You win!'
    else:
        return 'Computer wins!'

def main():
    args = parse_arguments()
    user_choice = args.choice
    computer_choice = generate_computer_choice()
    winner = determine_winner(user_choice, computer_choice)
    print(f'Your choice: {user_choice}')
    print(f'Computer\'s choice: {computer_choice}')
    print(winner)

if __name__ == '__main__':
    main()

$ python rock_paper_scissors.py rock
Your choice: rock
Computer's choice: scissors
You win!