python中的机械化器-选择没有名称的表单字段

我有一个类似于和的问题

我想在登录屏幕后面刮取一个网站的数据。但是，我不知道如何选择没有名称的表单字段。控件如下所示：

<TextControl(<None>=)>
<PasswordControl(<None>=)>
<CheckboxControl(<None>=[on])>
<SubmitButtonControl(<None>=) (readonly)>>

import mechanize
from bs4 import BeautifulSoup
import urllib2 
import cookielib

cj = cookielib.CookieJar()
br = mechanize.Browser()
br.set_cookiejar(cj)
br.set_handle_robots(False)
hdr = {'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11',
       'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
       'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.3',
       'Accept-Encoding': 'none',
       'Accept-Language': 'en-US,en;q=0.8',
       'Connection': 'keep-alive'}

url = "www.example.com"
request = urllib2.Request(url, None, hdr)
response = br.open(request)
forms =  [form for form in br.forms()][0]
br.select_form(nr=0)

br.form.find_control(id="id").value = "loginname"

我试过这样的东西：

<TextControl(<None>=)>
<PasswordControl(<None>=)>
<CheckboxControl(<None>=[on])>
<SubmitButtonControl(<None>=) (readonly)>>

import mechanize
from bs4 import BeautifulSoup
import urllib2 
import cookielib

cj = cookielib.CookieJar()
br = mechanize.Browser()
br.set_cookiejar(cj)
br.set_handle_robots(False)
hdr = {'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.11 (KHTML, like Gecko) Chrome/23.0.1271.64 Safari/537.11',
       'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
       'Accept-Charset': 'ISO-8859-1,utf-8;q=0.7,*;q=0.3',
       'Accept-Encoding': 'none',
       'Accept-Language': 'en-US,en;q=0.8',
       'Connection': 'keep-alive'}

url = "www.example.com"
request = urllib2.Request(url, None, hdr)
response = br.open(request)
forms =  [form for form in br.forms()][0]
br.select_form(nr=0)

br.form.find_control(id="id").value = "loginname"

这是：

forms[0].set_value("new value", nr=0)

---

这会引发错误，例如

mechanize.\u response.httperror\u seek\u包装器：HTTP错误403:禁止

或

TypeError:控件名称必须是类似字符串的

。我不知道还能尝试什么。请帮帮我。

根据您的密码：

url = "www.example.com"
request = urllib2.Request(url, None, hdr)
response = br.open(request)
forms =  [form for form in br.forms()][0]
br.select_form(nr=0)

在此之后：

aux = 0
for f in br.form.controls:
    print f,
    print '   ---> Number: ',
    print aux
    aux = aux + 1 

结果是：

<TextControl(<None>=)>   ---> Number:  0 
<PasswordControl(<None>=)>   ---> Number:  1
<CheckboxControl(<None>=[on])>   ---> Number:  2
<SubmitButtonControl(<None>=) (readonly)>   ---> Number:  3

因此：

结果将是：

<TextControl(<None>=loginname)>
<PasswordControl(<None>=password)>
<CheckboxControl(<None>=[on])>
<SubmitButtonControl(<None>=) (readonly)>