获取请求 - Python 循环

Question

如何每 X 分钟从 openweather api 获取数据？我想使用 Raspberry Pi Zero W 在 16x2 LCD 上显示这些数据。

import lcddriver
import time
import datetime
import requests, json 

display = lcddriver.lcd()
complete_url = "http://api.openweathermap.org/data/2.5/weather?q=CITY&APPID=****HIDE_API*****" 

response = requests.get(complete_url)

x = response.json() 


if x["cod"] != "404": 

    y = x["main"] 

    current_temperature = y["temp"] 


    current_pressure = y["pressure"] 


    current_humidiy = y["humidity"] 




    z = x["weather"] 


    weather_description = z[0]["description"] 
try:


        print("Writing to display")
        display.lcd_display_string("Temperatura zew:",1) 
        display.lcd_display_string(str(current_temperature-273.15) + " C", 2) 
        time.sleep(10)  
        display.lcd_clear()                                   
        display.lcd_display_string("Cisnienie ", 1)
        display.lcd_display_string(str(current_pressure) + " hPa",2) 
        time.sleep(10) 
        display.lcd_clear()
        display.lcd_display_string("Wilgotnosc ", 1)
        display.lcd_display_string(str(current_humidiy) + " %",2)
        time.sleep(10)                                    
        display.lcd_clear()                             
        time.sleep(1)                                    

except KeyboardInterrupt: # If there is a KeyboardInterrupt (when you press ctrl+c), exit the program and cleanup
    print("Cleaning up!")
    display.lcd_clear()

Answer 1

假设您的代码工作正常，因为我没有看到错误。您可以将代码置于无限循环中。

import time

x = 0
while True:
    print(x)
    x += 1
    time.sleep(1)

上面的示例代码将一直打印到程序以 1 秒的间隔停止：

0
1
2
3
.
.
.

您也可以使用time.sleep(12*60)。

Answer 2

import threading, time

def fetch_data():
    threading.Timer(5.0, fetch_data).start()
    print(time.time())
    # Fetch data from api
    # Update LCD


fetch_data()

Answer 3

这样的事情怎么样。我们可以使用 time.time() 来获取当前时间（UNIX 格式）。如果当前时间比 last_time 大 10 分钟（60 秒 x 10），我们检查了天气，我们调用一个函数从 API 获取天气。

（未经测试的代码，因为我没有 lcddriver 或 API 密钥）

import lcddriver
import time
import datetime
import requests, json 

display = lcddriver.lcd()

def get_weather():

    complete_url = "http://api.openweathermap.org/data/2.5/weather?q=CITY&APPID=****HIDE_API*****" 
    response = requests.get(complete_url)
    x = response.json() 

    if x["cod"] != "404": 
        return x
    else:
        return None

weather = None

try:
    last_update_time = 0
    while True:
        if last_update_time  + (60*10) > time.time():
            weather = get_weather()
            last_update_time = time.time()

        if weather:
            print("Writing to display")
            display.lcd_display_string("Temperatura zew:",1) 
            display.lcd_display_string(str(weather['temp']-273.15) + " C", 2) 
            time.sleep(10)  
            display.lcd_clear()                                   
            display.lcd_display_string("Cisnienie ", 1)
            display.lcd_display_string(str(weather['pressure']) + " hPa",2) 
            time.sleep(10) 
            display.lcd_clear()
            display.lcd_display_string("Wilgotnosc ", 1)
            display.lcd_display_string(str(weather['humidity']) + " %",2)
            time.sleep(10)                                    
            display.lcd_clear()                             
            time.sleep(1)                                    

except KeyboardInterrupt: # If there is a KeyboardInterrupt (when you press ctrl+c), exit the program and cleanup
    print("Cleaning up!")
    display.lcd_clear()