连续检查JSON URL是否使用Python中的数据更改

Question

我有一个写的小脚本（见下文），从Web URL获取JSON数据。目的是打印JSON中的任何新数据。有什么办法可以每5秒连续检查URL并报告任何更改？我确定我做得不正确，但是我尝试的是从JSON对象项目创建第一个列表，等待5秒钟创建第二个列表，然后比较两个列表。这显然不是这样做的方法，因为我仍然必须每次都必须自己运行脚本。我只想在脚本上运行脚本，将其作为“听”或“民意调查” URL，然后退回数据中的任何更改。我的代码在下面，非常感谢您对我的脚本提出的任何其他优化。

import json, requests 
import time

urls=["https://api.coingecko.com/api/v3/coins/markets?vs_currency=usd&order=market_cap_desc&per_page=250&page=1&sparkline=false", "https://api.coingecko.com/api/v3/coins/markets?vs_currency=usd&order=market_cap_desc&per_page=250&page=2&sparkline=false"]

def get_data(url):
    url = requests.get(url)
    text = url.text
    data = json.loads(text)
    coins = [coin['id'] for coin in data]
    return coins
 
def check_new_coins():
    first_list = get_data(url)
    time.sleep(5)
    second_list= get_data(url)
    new_coins = list(set(second_list).difference(first_list))

    if len(new_coins) > 0:
        for new_coin in new_coins:
            print(new_coin)
    else:
        print("No new coins")

for url in urls:
    check_new_coins()

Answer 1

我认为这就是您正在寻找的

import json, requests 
import time

class Checker:
    def __init__(self, urls, wait_time):
        self.wait_time = wait_time
        self.urls = urls
        self.coins = self.get_coins()
        self.main_loop()
    
    @staticmethod
    def get_data(url):
        url = requests.get(url)
        text = url.text
        data = json.loads(text)
        coins = [coin['id'] for coin in data]
        return coins
    
    def get_coins(self):
        coins = set()
        for url in self.urls:
            coins.update(Checker.get_data(url))
        return coins

    def check_new_coins(self):
        new_coins = self.get_coins()
        
        coins_diff = list(new_coins.difference(self.coins))
        
        current_time = time.strftime("%H:%M:%S", time.localtime())
        
        if len(coins_diff) > 0:
            print(current_time, coins_diff)
        else:
            print(current_time, "No new coins")

        self.coins = new_coins
    
    def main_loop(self):
        while True:
            time.sleep(self.wait_time)
            self.check_new_coins()

if __name__ == '__main__':
    urls=[
        "https://api.coingecko.com/api/v3/coins/markets?vs_currency=usd&order=market_cap_desc&per_page=250&page=1&sparkline=false",
        "https://api.coingecko.com/api/v3/coins/markets?vs_currency=usd&order=market_cap_desc&per_page=250&page=2&sparkline=false"
    ]

    Checker(urls, 5)

样本输出：

18:57:20 No new coins
18:57:25 No new coins
18:57:30 No new coins
18:57:35 No new coins
18:57:41 No new coins
18:57:46 No new coins
18:57:51 No new coins
18:57:56 No new coins