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我是第一次使用Python从网络上提取数据.多亏了其他一些帖子以及webpage,我才知道如何使用机械化模块将数据提交到表单.
现在,我坚持寻找如何提取结果.提交表单时会有很多不同的结果,但是如果我可以访问csv文件,那将是完美的.我假设您必须使用re模块,但是如何通过Python下载结果呢?
运行作业后,csv文件位于此处:摘要=>结果=>下载重链表(您只需单击“加载示例”即可查看该网页的工作方式).
import re
import mechanize
br = mechanize.browser()
br.set_handle_robots(false) # ignore robots
br.set_handle_refresh(false) # can sometimes hang without this
url = 'http://circe.med.uniroma1.it/proaBC/index.PHP'
response = br.open(url)
br.form = list(br.forms())[1]
# Controls can be found by name
control1 = br.form.find_control("light")
# Text controls can be set as a String
br["light"] = "DIQMTQSPASLSASVGETVTITCRASGNIHNYLAWYQQKQGKSPQLLVYYTTTLADGVPSRFSGSGSGTQYSLKINSLQPEDFGSYYCQHFWSTPRTFGGGTKLEIKRADAAPTVSIFPPSSEQLTSGGASVVCFLNNFYPKDINVKWKIDGSERQNGVLNSWTDQDSKDSTYSMSSTLTLTKDEYERHNSYTCEATHKTSTSPIVKSFNRNEC"
br["heavy"] = "QVQLKESGPGLVAPSQSLSITCTVSGFSLTGYGVNWVRQPPGKGLEWLGMIWGDGNTDYNSALKSRLSISKDNSKSQVFLKMNSLHTDDTARYYCARERDYRLDYWGQGTTLTVSSASTTPPSVFPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSssvTVPSSPRPSETVTCNVAHPASSTKVDKKIVPRDC"
# To submit form
response = br.submit()
content = response.read()
# print content
result = re.findall(r"Prob_Heavy.csv", content)
print result
打印内容时,我感兴趣的行如下所示:
<h2>Results</h2><br>
PreDictions for Heavy Chain:
<a href='u17003I9f1/Prob_Heavy.csv'>Download Heavy Chain Table</a><br>
PreDictions for Light Chain:
<a href='u17003I9f1/Prob_Light.csv'>Download Light Chain Table</a><br>
因此,问题是:如何下载/访问href =’u17003I9f1 / Prob_Heavy.csv’?
解决方法:
这是一个使用BeautifulSoup的快速且肮脏的示例,它请求避免使用正则表达式解析HTMl. sudo pip install bs4(如果您已安装pip但尚未安装BeautifulSoup).
import re
import mechanize
from bs4 import BeautifulSoup as bs
import requests
import time
br = mechanize.browser()
br.set_handle_robots(false) # ignore robots
br.set_handle_refresh(false) # can sometimes hang without this
url_base = "http://circe.med.uniroma1.it/proaBC/"
url_index = url_base + "index.PHP"
response = br.open(url_indeX)
br.form = list(br.forms())[1]
# Controls can be found by name
control1 = br.form.find_control("light")
# Text controls can be set as a String
br["light"] = "DIQMTQSPASLSASVGETVTITCRASGNIHNYLAWYQQKQGKSPQLLVYYTTTLADGVPSRFSGSGSGTQYSLKINSLQPEDFGSYYCQHFWSTPRTFGGGTKLEIKRADAAPTVSIFPPSSEQLTSGGASVVCFLNNFYPKDINVKWKIDGSERQNGVLNSWTDQDSKDSTYSMSSTLTLTKDEYERHNSYTCEATHKTSTSPIVKSFNRNEC"
br["heavy"] = "QVQLKESGPGLVAPSQSLSITCTVSGFSLTGYGVNWVRQPPGKGLEWLGMIWGDGNTDYNSALKSRLSISKDNSKSQVFLKMNSLHTDDTARYYCARERDYRLDYWGQGTTLTVSSASTTPPSVFPLAPGSAAQTNSMVTLGCLVKGYFPEPVTVTWNSGSLSSGVHTFPAVLQSDLYTLSssvTVPSSPRPSETVTCNVAHPASSTKVDKKIVPRDC"
# To submit form
response = br.submit()
content = response.read()
# print content
soup = bs(content)
urls_csv = [x.get("href") for x in soup.findAll("a") if ".csv" in x.get("href")]
for file_path in urls_csv:
status_code = 404
retries = 0
url_csv = url_base + file_path
file_name = url_csv.split("/")[-1]
while status_code == 404 and retries < 10:
print "{} not ready yet".format(file_name)
req = requests.get(url_csv )
status_code = req.status_code
time.sleep(5)
print "{} ready. Saving.".format(file_name)
with open(file_name, "wb") as f:
f.write(req.content)
在REPL中运行脚本:
Prob_Heavy.csv not ready yet
Prob_Heavy.csv not ready yet
Prob_Heavy.csv not ready yet
Prob_Heavy.csv ready. Saving.
Prob_Light.csv not ready yet
Prob_Light.csv ready. Saving.
>>>
>>>
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