#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import datetime
import requests
import xml.etree.ElementTree as ET

def chance_of_rain(pref_url, date):
    if date is None:
        date = datetime.datetime.today().strftime("%Y/%m/%d")
    root = ET.fromstring(requests.get(pref_url).content)
    for area in root.iter('area'):
            for info in area.findall('info'):
                if info.get('date') == date:
                    rainfallchance = info.find('rainfallchance')
                    for period in rainfallchance.findall('period'):
                        yield period.get('hour'), period.text

if __name__ == '__main__':
    prefecture = 'http://www.drk7.jp/weather/xml/27.xml'
    hours = '00-06', '06-12', '12-18', '18-24'
    date = datetime.datetime.today().strftime("%Y/%m/%d")
    print('Precipitation probability in Osaka', date)
    for hour, percent in chance_of_rain(prefecture, date):
        if hour in hours:
            print('%sh %s%%' % (hour, percent))

$ python weather.py 
Precipitation probability in Osaka 2019/08/13
00-06h 0%
06-12h 0%
12-18h 10%
18-24h 10%

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