我想自动化从UCSC基因组浏览器中提取信息的过程,以节省大量的手动输入。以下代码获取我认为是表单的正确部分,但我无法提取结果:
from mechanize import Browser
from bs4 import BeautifulSoup
import requests
import re
br = Browser()
url = 'http://genome-euro.ucsc.edu/cgi-bin/hgTables?hgsid=201790284_dkwVYFu7V6ISmTzFGlXzo23aUhXk'
br.set_handle_robots( False )
for form in br.forms():
if form['position']:
print form['position']
form['position'] = 'chr9:21802635-21865969'
print form['position']
break
for form in br.forms():
if form['hgta_doTopSubmit']:
br.submit()
第一部分工作正常,改变了要查询的基因组的位置。第二部分似乎没有提交任何内容。它返回此错误:
追踪(最近一次通话): 文件" C:\ Documents and Settings \ Silvia \ Desktop \ Copy \ web_scraping \ UCSC \ table_browser_form.py",第26行,in br.submit() 文件" C:\ Python27 \ lib \ site-packages \ mechanize-0.2.5-py2.7.egg \ mechanize_mechanize.py",第541行,提交 return self.open(self.click(* args,** kwds)) 文件" C:\ Python27 \ lib \ site-packages \ mechanize-0.2.5-py2.7.egg \ mechanize_mechanize.py",第530行,点击 request = self.form.click(* args,** kwds) AttributeError:' NoneType'对象没有属性'点击'
手动网站会返回与此位置详细信息对应的文本屏幕,但我似乎无法在此处提取。有没有人有任何建议如何解决这个问题?我只需要存储输出结果 - 相当于用户按下“获得结果”#39;在网站上。非常感谢。
答案 0 :(得分:1)
您始终可以使用requests
:
import requests
url = 'http://genome-euro.ucsc.edu/cgi-bin/hgTables?hgsid=201790284_dkwVYFu7V6ISmTzFGlXzo23aUhXk'
session = requests.Session()
params = {
'hgsid': '201790284_dkwVYFu7V6ISmTzFGlXzo23aUhXk',
'jsh_pageVertPos': '0',
'clade': 'mammal',
'org': 'Human',
'db': 'hg19',
'hgta_group': 'genes',
'hgta_track': 'refGene',
'hgta_table': 'refFlat',
'hgta_regionType': 'range',
'position': 'chr9:21802635-21865969',
'hgta_outputType': 'gff',
'boolshad.sendToGalaxy': '0',
'boolshad.sendToGreat': '0',
'boolshad.sendToGenomeSpace': '0',
'hgta_outFileName': '',
'hgta_compressType': 'none',
'hgta_doTopSubmit': 'get output'
}
response = session.post(url, data=params)
print response.content
打印:
chr9 hg19_refFlat start_codon 21802748 21802750 0.000000 + . gene_id "MTAP"; transcript_id "MTAP";
chr9 hg19_refFlat CDS 21802748 21802780 0.000000 + 0 gene_id "MTAP"; transcript_id "MTAP";
chr9 hg19_refFlat exon 21802635 21802780 0.000000 + . gene_id "MTAP"; transcript_id "MTAP";
chr9 hg19_refFlat CDS 21815432 21815518 0.000000 + 0 gene_id "MTAP"; transcript_id "MTAP";
...
chr9 hg19_refFlat exon 21861975 21865969 0.000000 + . gene_id "MTAP"; transcript_id "MTAP";