Python3 XML 获取雅虎天气的实现方法

参考廖雪峰的Python教程，实现Linux Python3获取雅虎天气

#!/usr/bin/env python3
# coding: utf-8
import os
from datetime import datetime
from urllib import request
from xml.parsers.expat import ParserCreate
file_name = "weather.txt"
for root, dirs, files in os.walk("."):
if file_name in files:
 os.remove(os.path.join(root, file_name))
def yahoo_weather(data):
flag = False
weather = {"city": "", "pubdate": "", "forecast": []}
def start_element(name, attrs):
 if name == "yweather:location":
  weather["city"] = weather["city"] + attrs["city"]
  weather["city"] = weather["city"] + " " + attrs["country"]
 if name == "yweather:forecast":
  forecast = {}
  forecast["date"] = attrs["date"]
  forecast["day"] = attrs["day"]
  forecast["high"] = attrs["high"]
  forecast["low"] = attrs["low"]
  forecast["text"] = attrs["text"]
  weather["forecast"].append(forecast)
 if name == "pubDate":
  nonlocal flag
  flag = True

def char_data(text):
 nonlocal flag
 if flag:
  weather["pubdate"] = text
  flag = False
parser = ParserCreate()
parser.StartElementHandler = start_element
parser.CharacterDataHandler = char_data
parser.Parse(data)
return weather
def print_weather(weather):
with open(file_name, "a") as f:
 s = "City: ％s\nPub date: ％s" ％(weather["city"], weather["pubdate"])
 print("％s" ％(weather["city"]))
 f.write(s + "\n")
 for forecast in weather["forecast"]:
  date = datetime.strptime(forecast["date"], "％d ％b ％Y").strftime("％Y-％m-％d")
  s = "Date: ％s High: ％s Low: ％s Weather: ％s" ％(date, forecast["high"], forecast["low"], forecast["text"])
  f.write(s + "\n")
 f.write("\n")
citys = ["2151330", "2151849", "44418", "615702", "2514815"]
for city in citys:
url = "https://query.yahooapis.com/v1/public/yql?q=select％20*％20from％20weather.forecast％20where％20woeid％20％3D％20"
url = url + city
url = url + "&format=xml"
with request.urlopen(url, timeout=4) as f:
 weather = yahoo_weather(f.read())
 print_weather(weather)
print("weather conditions has written to ％s" ％(file_name))

来源：http://blog.csdn.net/mabing993/article/details/79210096