分析chap3编写的几个版本：

V1.1 CLI版本

import requests, json

def query_realtime():
    '''query realtime weather'''
    r = requests.get(url)
    result = json.loads(r.text)
    city = result["results"][0]['location']['name']
    realtime = result["results"][0]['last_update']
    temperature = result["results"][0]['now']['temperature']
    weather = result["results"][0]['now']['text']

    return city + realtime + "天气情况为：" + weather + "," + "温度："+ temperature + "摄氏度"


with open("log.txt", "w", encoding = "utf-8") as f:
    f.write("您的查询记录如下：\n")


while True:

    user_input = input("请输入城市或指令：")

    if user_input in {"quit", "exit"}:
        break
    elif user_input == "history":
        with open("log.txt", "r", encoding = "utf-8") as f:
            print(f.read())
    elif user_input == "help":
        with open("README.md", "r", encoding = "utf-8") as f:
            print(f.read())
    else:
        url = "https://api.thinkpage.cn/v3/weather/now.json?key=kdtkmkoewxfhmqbx&location=" + user_input + "&language=zh-Hans&unit=c"
        get_weather = query_realtime()

        with open("log.txt", "a", encoding = "utf-8") as f:
            f.write(get_weather + "\n")
        print(get_weather)

V2.1 GUI版本

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
from tkinter import *
import requests, json

def query_realtime(url):
    '''query realtime weather'''
    r = requests.get(url)
    result = json.loads(r.text)
    city = result["results"][0]['location']['name']
    realtime = result["results"][0]['last_update']
    temperature = result["results"][0]['now']['temperature']
    weather = result["results"][0]['now']['text']

    str = city + realtime + "天气情况为：" + weather + "," + "温度："+ temperature + "摄氏度"
    log(str)
    return str


def callback():
    #点击查询按钮，将查询结果输出到文本显示区域
    text.config(state=NORMAL)
    if e.get():
        print(e.get())
        str1 = e.get()
        url = "https://api.thinkpage.cn/v3/weather/now.json?key=kdtkmkoewxfhmqbx&location=" + str1 + "&language=zh-Hans&unit=c"
        str2 = query_realtime(url) + "\n"
        text.insert(END, str2)
        print(str2)
        e.delete(0, END)
    text.config(state=DISABLED)

def print_help():
    #点击帮助按钮，将帮助文档显示到文本显示区域
    text.config(state=NORMAL)

    with open("README.md", "r", encoding = "utf-8") as f:
        str = f.read()

    text.insert(END, str)
    print(str)
    text.config(state=DISABLED)

def log(str):
    with open("log.txt", "a", encoding = "utf-8") as f:
        f.write(str + "\n")
    return f

def print_log():
    #打印查询日志
    text.config(state=NORMAL)
    with open("log.txt", "r", encoding = "utf-8") as f:
        text.insert(END, f.read())
        print(f.read())
    text.config(state=DISABLED)    

if __name__ =='__main__':
    master = Tk()
    master.title("天气查询小程序")

    text = Text(master)
    text.pack()
    text.config(state=DISABLED)

    with open("log.txt", "w", encoding = "utf-8") as f:
        f.write("您的查询历史如下：\n")

    Label(master, text = "请输入城市名称：").pack(side = "left")

    e = Entry(master)
    e.pack(side = "left")
    e.focus_set()



    Button(master, text="查询", width=10, command = callback).pack(side = "left")

    Button(master, text="历史", width=10, command = print_log).pack(side = "left")
    Button(master, text="帮助", width=10, command = print_help).pack(side = "left")
    Button(master, text="退出", width=10, command = master.destroy).pack(side = "left")

    mainloop()

V3.1

进阶任务