Python第三周之文件的读写以及简单的爬虫介绍

文件的读写

　　读

import time


def main():
    """
    文件的读写，注意open的用法以及，文件地址的输入。
    :return: 
    """
    temp = open('abcd/hello.txt', 'r', encoding='utf-8')   # 打开文件名，r 为读， w 为写。
    contents = temp.readlines()
    for content in contents:
        print(content)
        time.sleep(1)
　　temp.close()


if __name__ == '__main__':
    main()

　　写

def main():
    try:
        with open('abcd/hello.txt', 'w', encoding='utf-8') as fs:
            fs.write('奥尼')
    except FileNotFoundError:
        print('无法打开')
    except IOError as e:
        print(e)


if __name__ == '__main__':
    main()

读和写

def main():

    try:
        with open('abcd/a.jpg', 'rb') as fs1:
            date = fs1.read()
        with open('efg/b.jpg', 'wb') as fs2:
            fs2.write(date)

    except FileNotFoundError:
        print('无法打开')
    except IOError:
        print('读写错误')
    print('程序执行结束')


if __name__ == '__main__':
    main()

爬网络上的图片

import json
import requests


def main():
    resp = requests.get('http://api.tianapi.com/nba/?key=81085f5747a59581327b29d1bccfb925&num=10')
    mydict = json.loads(resp.text)
    print(mydict)
    for tempdict in mydict['newslist']:
        pic_url = tempdict['picUrl']
        resp = requests.get(pic_url)
        filename = pic_url[pic_url.rfind('/') + 1:]
        try:
            with open(filename, 'wb') as fs:
                fs.write(resp.content)
        except IOError as e:
            print(e)


if __name__ == '__main__':
    main()