#查找最高温度正则表达式

find_htemp = re.compile(r'

',re.S)

#查找最低温度正则表达式

find_dtemp = re.compile(r'

',re.S)

#查找天气情况正则表达式

find_tianqi = re.compile(r'

',re.S)

#查找风力正则表达式

find_fengli = re.compile(r'

',re.S)

#生成查询网址的函数

def genHTML(cityname,year):

months = ["%d%02d" % (year, month + 1) for month in range(12)]

todo_urls = [f"http://lishi.tianqi.com/{cityname}/{month}.html" for month in months]

return todo_urls

#抓取网页信息

def askURL(url):

headers = {

"User-Agent": "Mozilla / 5.0(Windows NT 10.0; WOW64) AppleWebKit / 537.36(KHTML, like Gecko) Chrome/78.0.3904.108 Safari / 537.36"

}

res = requests.get(url, headers=headers)

res = res.content.decode("utf-8")

return res

#解析网页信息

def getdata(res):

datalist = [ ]

soup = BeautifulSoup(res, "html.parser")

data = soup.find_all('ul',class_="lishitable_content clearfix")

data = str(data)

dates = re.findall(find_date,data)

dtemp = re.findall(find_dtemp,data)

htemp = re.findall(find_htemp,data)

tianqi = re.findall(find_tianqi,data)

fengli = re.findall(find_fengli,data)

for i in range(len(dates)):

datalist.append([dates[i],dtemp[i],htemp[i],tianqi[i],fengli[i]])

return datalist

#保存信息至文件

def saveData(datalist,cityname,year):

wb = openpyxl.Workbook()

ws = wb.active

ws['A1'] = "日期"

ws['B1'] = "最低温度"

ws['C1'] = "最高温度"

ws['D1'] = "天气"

ws['E1'] = "风力"

#datalist为双层列表

for i in range(12):

for each in datalist[i]:

ws.append(each)

wb.save("%d年%s历史天气.xlsx"%(year,cityname))

def main():

print("-------历史天气查询系统-------")

cityname = input("请输入城市名称(小写全拼)：")

year = int(input("请输入查询年份："))

urls = genHTML(cityname,year)

result = []

for i in range(12):

res = askURL(urls[i])

result.append(getdata(res))

saveData(result,cityname,year)

if __name__ == '__main__':

main()