Python爬蟲(chóng)必備技巧詳細(xì)總結(jié)
自定義函數(shù)
import requests
from bs4 import BeautifulSoup
headers={'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0'}
def baidu(company):
url = 'https://www.baidu.com/s?rtt=4&tn=news&word=' + company
print(url)
html = requests.get(url, headers=headers).text
s = BeautifulSoup(html, 'html.parser')
title=s.select('.news-title_1YtI1 a')
for i in title:
print(i.text)
# 批量調(diào)用函數(shù)
companies = ['騰訊', '阿里巴巴', '百度集團(tuán)']
for i in companies:
baidu(i)
批量輸出多個(gè)搜索結(jié)果的標(biāo)題
結(jié)果保存為文本文件
import requests
from bs4 import BeautifulSoup
headers={'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0'}
def baidu(company):
url = 'https://www.baidu.com/s?rtt=4&tn=news&word=' + company
print(url)
html = requests.get(url, headers=headers).text
s = BeautifulSoup(html, 'html.parser')
title=s.select('.news-title_1YtI1 a')
fl=open('test.text','a', encoding='utf-8')
for i in title:
fl.write(i.text + '\n')
# 批量調(diào)用函數(shù)
companies = ['騰訊', '阿里巴巴', '百度集團(tuán)']
for i in companies:
baidu(i)
寫(xiě)入代碼
fl=open('test.text','a', encoding='utf-8')
for i in title:
fl.write(i.text + '\n')
異常處理
for i in companies:
try:
baidu(i)
print('運(yùn)行成功')
except:
print('運(yùn)行失敗')
寫(xiě)在循環(huán)中 不會(huì)讓程序停止運(yùn)行 而會(huì)輸出運(yùn)行失敗
休眠時(shí)間
import time
for i in companies:
try:
baidu(i)
print('運(yùn)行成功')
except:
print('運(yùn)行失敗')
time.sleep(5)
time.sleep(5)
括號(hào)里的單位是秒
放在什么位置 則在什么位置休眠（暫停）
爬取多頁(yè)內(nèi)容
百度搜索騰訊
切換到第二頁(yè)
去掉多多余的
https://www.baidu.com/s?wd=騰訊&pn=10
分析出
https://www.baidu.com/s?wd=騰訊&pn=0 為第一頁(yè)
https://www.baidu.com/s?wd=騰訊&pn=10 為第二頁(yè)
https://www.baidu.com/s?wd=騰訊&pn=20 為第三頁(yè)
https://www.baidu.com/s?wd=騰訊&pn=30 為第四頁(yè)
..........
代碼
from bs4 import BeautifulSoup
import time
headers={'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0'}
def baidu(c):
url = 'https://www.baidu.com/s?wd=騰訊&pn=' + str(c)+'0'
print(url)
html = requests.get(url, headers=headers).text
s = BeautifulSoup(html, 'html.parser')
title=s.select('.t a')
for i in title:
print(i.text)
for i in range(10):
baidu(i)
time.sleep(2)
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