一、類

init方法必須有self引數

二、安裝和使用庫

1.使用庫

2.安裝庫

pip install resquests
import requests
html = rewuests.get(‘http://king.info’).content.decode()
print(html)

三、讀寫檔案

1.讀寫普通檔案

with open ('class2.txt','w',encoding='utf-8') as f:
    f.write('測試')
    f.writelines('包含字串的列表')

會直接替換原文
若要在後面新增將w改為a

2.讀寫csv檔案

import csv
with open('dd_out.csv',encoding='gbk') as f:
    reader = csv.DictReader(f)
    for row in reader:
        print(row('1'))

data = [{'name':'zx','age':25,'salary':9999},
       {'name':'zhx','age':26,'salary':19999}]
with open('class2_write.csv'.'w',encoding='utf-8') as f:
    writer = csv.DictWriter(f,fieldnames=['name','age','salary'])
    writer.writeheadwer()
    writer.writerows(data)