使用Python/mechanize select_form()时出错?

我正试图从网站上删除一些数据。

http://www.atpworldtour.com/Rankings/Singles.aspx

应模拟用户通过每个选项获得额外排名和日期,并模拟点击Go,然后在获取数据后应使用back功能。

目前,我一直在尝试选择此选项作为附加站姿:

            <option value="101" >101-200</option>

from mechanize import Browser
from BeautifulSoup import BeautifulSoup
import re
import urllib2



br = Browser();
br.open("http://www.atpworldtour.com/Rankings/Singles.aspx");
br.select_form(nr=0);
br["r"] = "101";

response = br.submit();

这是Python返回的日志:

>>> from mechanize import Browser
>>>
>>> from BeautifulSoup import BeautifulSoup
>>> import re
>>> import urllib2
>>>
>>>
>>>
>>> br = Browser();
>>> br.open("http://www.atpworldtour.com/Rankings/Singles.aspx");
<response_seek_wrapper at 0x311bb48L whose wrapped object = <closeable_response
at 0x311be88L whose fp = <socket._fileobject object at 0x0000000002C94408>>>
>>> br.select_form(nr=0);
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "build\bdist.win-amd64\egg\mechanize\_mechanize.py", line 505, in select_
form
  File "build\bdist.win-amd64\egg\mechanize\_html.py", line 546, in __getattr__
  File "build\bdist.win-amd64\egg\mechanize\_html.py", line 559, in forms
  File "build\bdist.win-amd64\egg\mechanize\_html.py", line 228, in forms
mechanize._html.ParseError

我在mechanize主页上找不到对所有功能的正确解释。有人能给我指出一个关于使用表单和机械化的正确教程,或者在这个问题上帮助我吗?