【Python】メルカリの自動値下げツールを作成したので解説！

import logging
import platform
import pyperclip
import random
import time
from functools import wraps
from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys

options = Options()
options.add_argument("--user-data-dir=/Users/izumikohei/Library/Application Support/Google/Chrome/UserData")
driver = webdriver.Chrome(options=options)
driver.implicitly_wait(10)

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s %(levelname)s %(message)s",
    datefmt="%Y/%m/%d %H:%M:%S"
)
logger = logging.getLogger(__name__)

def sleep(min=2, max=5):
    time.sleep(random.uniform(min, max))

def sleep_after_execution(min=2, max=5):
    def decorator(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            result = func(*args, **kwargs)
            sleep(min, max)
            return result
        return wrapper
    return decorator

@sleep_after_execution()
def open_site():
    driver.get("https://jp.mercari.com/mypage/listings")

def get_hrefs():
    hrefs = []

    hrefs_elem = driver.find_elements(By.CSS_SELECTOR, "#currentListing > div > div > div > a")
    for elem in hrefs_elem:
        href = elem.get_attribute("href")
        hrefs.append(href)
    
    return hrefs

@sleep_after_execution(30, 50)
def open_item_page(href):
    driver.get(href)

@sleep_after_execution(5, 10)
def click_checkout_button():
    driver.find_element(By.XPATH, "//div[@data-testid='checkout-button']/a").click()

@sleep_after_execution()
def scroll_to_price():
    price_input = driver.find_element(By.XPATH, "//input[@name='price']")
    driver.execute_script("arguments[0].scrollIntoView();", price_input)

@sleep_after_execution()
def set_reduce_price():
    price_input = driver.find_element(By.XPATH, "//input[@name='price']")
    price = int(price_input.get_attribute("value"))

    price_input.send_keys(Keys.COMMAND if platform.system() == "Darwin" else Keys.CONTROL, "a")
    sleep()

    price_input.send_keys(Keys.DELETE)
    sleep()

    reduce_price = price - 100
    price_input.send_keys(reduce_price)

@sleep_after_execution()
def scroll_to_bottom():
    driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")

@sleep_after_execution()
def click_edit_button():
    driver.find_element(By.XPATH, "//button[@data-testid='edit-button']").click()

import mercari_common as common
import tkinter as tk

driver = common.driver
logger = common.logger

def main():
    try:
        logger.info("処理開始")

        common.open_site()
        hrefs = common.get_hrefs()

        for count, href in enumerate(hrefs, start=1):
            logger.info(f"{len(hrefs)}件中{count}件目の値下げ中...")

            common.open_item_page(href)
            common.click_checkout_button()

            common.scroll_to_price()
            common.set_reduce_price()
            common.scroll_to_bottom()
            common.click_edit_button()

        logger.info("処理終了")
    except Exception as e:
        logger.error(f"予期せぬエラーが発生しました: {e}")
    finally:
        driver.quit()

if __name__ == "__main__":
    main()
    root = tk.Tk()
    root.geometry('1200x1200')
    root.title('メルカリ自動値下げツール')

    button = tk.Button(root, text="実行", command=main)
    button.grid(row=3, columnspan=2, pady=10)

    root.mainloop()