python 第三课 爬虫

已安装python环境，cmd文件中运行以下三句话

python -m pip install requests

python -m pip install parsel

python -m pip install urllib3

 

爬虫原理是从网页源代码中抓取想要的数据

 

贴代码：从豆瓣网上抓取前10页的信息

from re import M, X

from tkinter import Y

from matplotlib import pyplot as plt

import numpy as np

from pyparsing import alphanums

X=np.random.randint(0,100,30)

Y=np.random.randint(0,100,30)

fig,ax=plt.subplot()

v = np.random.randint(0,100,30)

ax.scatter(X,Y,s=200,c=v,alpha=0.7)

i,j = 0,0

while i<30:

    j = 0

    #j=28,0-29

    while j<29:

        d = (X[i]-X[j+1])**2 + (Y[i]-Y[j+1])**2

        if d <=2500:

            ax.plot([X[i],X[j+1]],[Y[i],Y[j+1]])

        j = j + 1

    i = i + 1

plt.show()

print(X,Y)