广东白云手机网站建设,网站设计与建设报告,潍坊百度seo,免费注册自己的网站1、日期生成
很多时候我们需要批量生成日期#xff0c;方法有很多#xff0c;这里分享两段代码
获取过去 N 天的日期#xff1a;
import datetimedef get_nday_list(n):before_n_days []for i in range(1, n 1)[::-1]:before_n_days.append(str(datetime.date.today() …1、日期生成
很多时候我们需要批量生成日期方法有很多这里分享两段代码
获取过去 N 天的日期
import datetimedef get_nday_list(n):before_n_days []for i in range(1, n 1)[::-1]:before_n_days.append(str(datetime.date.today() - datetime.timedelta(daysi)))return before_n_daysa get_nday_list(30)
print(a)输出
[2021-12-23, 2021-12-24, 2021-12-25, 2021-12-26, 2021-12-27, 2021-12-28, 2021-12-29, 2021-12-30, 2021-12-31, 2022-01-01, 2022-01-02, 2022-01-03, 2022-01-04, 2022-01-05, 2022-01-06, 2022-01-07, 2022-01-08, 2022-01-09, 2022-01-10, 2022-01-11, 2022-01-12, 2022-01-13, 2022-01-14, 2022-01-15, 2022-01-16, 2022-01-17, 2022-01-18, 2022-01-19, 2022-01-20, 2022-01-21]
生成一段时间区间内的日期
import datetimedef create_assist_date(datestart None,dateend None):# 创建日期辅助表if datestart is None:datestart 2016-01-01if dateend is None:dateend datetime.datetime.now().strftime(%Y-%m-%d)# 转为日期格式datestartdatetime.datetime.strptime(datestart,%Y-%m-%d)dateenddatetime.datetime.strptime(dateend,%Y-%m-%d)date_list []date_list.append(datestart.strftime(%Y-%m-%d))while datestartdateend:# 日期叠加一天datestartdatetime.timedelta(days1)# 日期转字符串存入列表date_list.append(datestart.strftime(%Y-%m-%d))return date_listd_list create_assist_date(datestart2021-12-27, dateend2021-12-30)
d_list输出
[2021-12-27, 2021-12-28, 2021-12-29, 2021-12-30]2、保存数据到CSV
保存数据到 CSV 是太常见的操作了
def save_data(data, date):if not os.path.exists(r2021_data_%s.csv % date):with open(2021_data_%s.csv % date, a, encodingutf-8) as f:f.write(标题,热度,时间,url\n)for i in data:title i[title]extra i[extra]time i[time]url i[url]row {},{},{},{}.format(title,extra,time,url)f.write(row)f.write(\n)else:with open(2021_data_%s.csv % date, a, encodingutf-8) as f:for i in data:title i[title]extra i[extra]time i[time]url i[url]row {},{},{},{}.format(title,extra,time,url)f.write(row)f.write(\n)3、带背景颜色的 Pyecharts
Pyecharts 作为 Echarts 的优秀 Python 实现受到众多开发者的青睐用 Pyecharts 作图时使用一个舒服的背景也会给我们的图表增色不少
以饼图为例通过添加 JavaScript 代码来改变背景颜色
def pie_rosetype(data) - Pie:background_color_js (new echarts.graphic.LinearGradient(0, 0, 0, 1, [{offset: 0, color: #c86589}, {offset: 1, color: #06a7ff}], false)
)c (Pie(init_optsopts.InitOpts(bg_colorJsCode(background_color_js))).add(,data,radius[30%, 75%],center[45%, 50%],rosetyperadius,label_optsopts.LabelOpts(formatter{b}: {c}),).set_global_opts(title_optsopts.TitleOpts(title),))return c4、requests 库调用
据统计requests 库是 Python 家族里被引用的最多的第三方库足见其江湖地位之高大
发送 GET 请求
import requestsheaders {user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36,cookie: some_cookie
}
response requests.request(GET, url, headersheaders)发送 POST 请求
import requestspayload{}
files[]
headers {user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36,cookie: some_cookie
}
response requests.request(POST, url, headersheaders, datapayload, filesfiles)根据某些条件循环请求比如根据生成的日期
def get_data(mydate):date_list create_assist_date(mydate)url https://test.testfiles[]headers {user-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36,cookie: }for d in date_list:payload{p: 10,day: d,nodeid: 1,t: itemsbydate,c: node}for i in range(1, 100):payload[p] str(i)print(get data of %s in page %s % (d, str(i)))response requests.request(POST, url, headersheaders, datapayload, filesfiles)items response.json()[data][items]if items:save_data(items, d)else:break5、Python 操作各种数据库
操作 Redis
连接 Redis
import redisdef redis_conn_pool():pool redis.ConnectionPool(hostlocalhost, port6379, decode_responsesTrue)rd redis.Redis(connection_poolpool)return rd写入 Redis
from redis_conn import redis_conn_poolrd redis_conn_pool()
rd.set(test_data, mytest)操作 MongoDB
连接 MongoDB
from pymongo import MongoClientconn MongoClient(mongodb://%s:%sipaddress:49974/mydb % (username, password))
db conn.mydb
mongo_collection db.mydata
批量插入数据
res requests.get(url, paramsquery).json()
commentList res[data][commentList]
mongo_collection.insert_many(commentList)操作 MySQL
连接 MySQL
import MySQLdb# 打开数据库连接
db MySQLdb.connect(localhost, testuser, test123, TESTDB, charsetutf8 )# 使用cursor()方法获取操作游标
cursor db.cursor()执行 SQL 语句
# 使用 execute 方法执行 SQL 语句
cursor.execute(SELECT VERSION())# 使用 fetchone() 方法获取一条数据
data cursor.fetchone()print Database version : %s % data# 关闭数据库连接
db.close()输出
Database version : 5.0.456、多线程代码
多线程也有很多实现方式
import threading
import timeexitFlag 0class myThread (threading.Thread):def __init__(self, threadID, name, delay):threading.Thread.__init__(self)self.threadID threadIDself.name nameself.delay delaydef run(self):print (开始线程 self.name)print_time(self.name, self.delay, 5)print (退出线程 self.name)def print_time(threadName, delay, counter):while counter:if exitFlag:threadName.exit()time.sleep(delay)print (%s: %s % (threadName, time.ctime(time.time())))counter - 1# 创建新线程
thread1 myThread(1, Thread-1, 1)
thread2 myThread(2, Thread-2, 2)# 开启新线程
thread1.start()
thread2.start()
thread1.join()
thread2.join()
print (退出主线程)
