python爬蟲得到谷歌學術搜索結果

python 爬蟲實現

本文使用python3 實現從谷歌學術獲得搜索結果

模擬瀏覽器發送請求

網絡訪問的模型使用請求應答的模型。客戶端發送請求，瀏覽器相應請求。

使用chrome瀏覽器獲得請求方式

在f12開發者模式下，查看請求頭，發現是使用get方法。複製爲url得到請求內容
爲了模擬瀏覽器，所以使用headers。
在headers中可以將cookies刪除，測試不影響

在python中實現

使用rullib中的模塊

數據分析

使用正則表達式
分析html文件。通過正則表達式匹配

代碼塊

import urllib.parse
import urllib.request

import re


keyword=input("keywords is?\n")
print(keyword)

url='https://scholar.google.com/scholar?&hl=en&q='+keyword+'&btnG=&lr='
header_dict={'Host': 'scholar.google.com',
             'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0',
             'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
             'Accept-Language': 'zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
             'Referer': 'https://scholar.google.com/schhp?hl=zh-CN',
             'Connection': 'keep-alive'}
req = urllib.request.Request(url=url,headers=header_dict)            
response = urllib.request.urlopen(req,timeout=120)
#print(f.read())
#with open('aaa.html', 'wb') as f:
#    f.write(response.read())

print("conneect succeed!")

'''data=response.read().decode('utf-8')
pattern = re.compile(r'<div class="gs_r"><div class="gs_ri"><h3.*?<a onclick',re.S)

for m in re.finditer(pattern,data):
    print (m.group())
'''
#print(response.read())
data=response.read()

data=data.decode()

pattern = re.compile(r'<div class="gs_ri">.*?</div></div></div>')

#print(data)
# 使用re.match匹配文本，獲得匹配結果，無法匹配時將返回None
result1 = re.search(pattern,data)

'''
if result1:
    # 使用Match獲得分組信息
    print (result1.group().encode('utf_8'))
else:
    print ('1匹配失敗！')
 '''
m=re.findall(pattern,data)
print("data get")
print(len(m))


address = re.compile(r'<a href=".*?"')
author= re.compile(r'<div class="gs_a">.*?</div>')
abstruct=re.compile(r'<div class="gs_rs">.*?</div>')

for s in m:
    net=re.search(address,s)
    temp=net.group()
    print("url:")
    print(temp[9:-1])
    net=re.search(author,s)
    temp=net.group()
    a1 = re.compile(r'<a.*?>')
    print("author:")
    #replacedStr = re.sub("\d+", "222", inputStr)
    temp= re.sub(a1,'',temp)
    print(temp[18:-6])
    net=re.search(abstruct,s)
    if(net):
        print("abstruct:")
        temp=net.group()
        temp=temp.replace("<b>"," ").replace("<br>"," ").replace("</b>"," ")
        print(temp[19:-6])

    else:
        print("no abstrutct")
    print('')





url='https://scholar.google.com/scholar?start=20&hl=en&q='+keyword+'234&btnG=&lr='
header_dict={'Host': 'scholar.google.com',
             'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0',
             'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
             'Accept-Language': 'zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
             'Referer': 'https://scholar.google.com/schhp?hl=zh-CN',
             'Connection': 'keep-alive'}
req = urllib.request.Request(url=url,headers=header_dict)            
response = urllib.request.urlopen(req,timeout=120)
#print(f.read())
#with open('aaa.html', 'wb') as f:
#    f.write(response.read())

print("conneect succeed!")

'''data=response.read().decode('utf-8')
pattern = re.compile(r'<div class="gs_r"><div class="gs_ri"><h3.*?<a onclick',re.S)

for m in re.finditer(pattern,data):
    print (m.group())
'''
#print(response.read())
data=response.read()

data=data.decode()

pattern = re.compile(r'<div class="gs_ri">.*?</div></div></div>')

#print(data)
# 使用re.match匹配文本，獲得匹配結果，無法匹配時將返回None
result1 = re.search(pattern,data)

'''
if result1:
    # 使用Match獲得分組信息
    print (result1.group().encode('utf_8'))
else:
    print ('1匹配失敗！')
 '''
m=re.findall(pattern,data)
print("data get")
print(len(m))


address = re.compile(r'<a href=".*?"')
author= re.compile(r'<div class="gs_a">.*?</div>')
abstruct=re.compile(r'<div class="gs_rs">.*?</div>')

for s in m:
    net=re.search(address,s)
    temp=net.group()
    print("url:")
    print(temp[9:-1])



    net=re.search(author,s)
    temp=net.group()
    a1 = re.compile(r'<a.*?>')
    print("author:")
    #replacedStr = re.sub("\d+", "222", inputStr)
    temp= re.sub(a1,'',temp)
    print(temp[18:-6])




    net=re.search(abstruct,s)
    if(net):
        print("abstruct:")
        temp=net.group()
        temp=temp.replace("<b>"," ").replace("<br>"," ").replace("</b>"," ")
        print(temp[19:-6])

    else:
        print("no abstrutct")
    print('')




start=20
start+=10


url='https://scholar.google.com/scholar?start='+str(start)+'&hl=en&q='+keyword+'234&btnG=&lr='
header_dict={'Host': 'scholar.google.com',
             'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0',
             'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
             'Accept-Language': 'zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3',
             'Referer': 'https://scholar.google.com/schhp?hl=zh-CN',
             'Connection': 'keep-alive'}
req = urllib.request.Request(url=url,headers=header_dict)            
response = urllib.request.urlopen(req,timeout=120)
#print(f.read())
#with open('aaa.html', 'wb') as f:
#    f.write(response.read())

print("conneect succeed!")

'''data=response.read().decode('utf-8')
pattern = re.compile(r'<div class="gs_r"><div class="gs_ri"><h3.*?<a onclick',re.S)

for m in re.finditer(pattern,data):
    print (m.group())
'''
#print(response.read())
data=response.read()

data=data.decode()

pattern = re.compile(r'<div class="gs_ri">.*?</div></div></div>')

#print(data)
# 使用re.match匹配文本，獲得匹配結果，無法匹配時將返回None
result1 = re.search(pattern,data)

'''
if result1:
    # 使用Match獲得分組信息
    print (result1.group().encode('utf_8'))
else:
    print ('1匹配失敗！')
 '''
m=re.findall(pattern,data)
print("data get")
print(len(m))


address = re.compile(r'<a href=".*?"')
author= re.compile(r'<div class="gs_a">.*?</div>')
abstruct=re.compile(r'<div class="gs_rs">.*?</div>')

for s in m:
    net=re.search(address,s)
    temp=net.group()
    print("url:")
    print(temp[9:-1])



    net=re.search(author,s)
    temp=net.group()
    a1 = re.compile(r'<a.*?>')
    print("author:")
    #replacedStr = re.sub("\d+", "222", inputStr)
    temp= re.sub(a1,'',temp)
    print(temp[18:-6])




    net=re.search(abstruct,s)
    if(net):
        print("abstruct:")
        temp=net.group()
        temp=temp.replace("<b>"," ").replace("<br>"," ").replace("</b>"," ")
        print(temp[19:-6])

    else:
        print("no abstrutct")
    print('')