Python 脚本在刮取多个值时抛出错误

我的脚本试图从一个网站中获取80000个存储在文本文件中的ID。当我用一个o/p运行代码时，它运行得很好，但是当我把所有的输入放在一个循环中时，我得到了一个错误

我的代码：

from bs4 import BeautifulSoup
import mechanize

br = mechanize.Browser()
response = br.open("https://www.matsugov.us/myproperty")

for form in br.forms():
    if form.attrs.get('name') == 'frmSearch':
        br.form = form
        break

br.form['ddlType']=["taxid"]

with open("names.txt") as ins:
    tx = ins.read().splitlines()

    for x in tx:
        br['txtParm'] = x
        req = br.submit().read()
        soup = BeautifulSoup(req, 'html.parser')
        table = soup.find('td', {'class': 'Grid_5'})

        for row in table:
            print row

错误：

---

AttributeError:mechanize.\u mechanize.Browser实例没有属性\u\u setitem\uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu！将其放置在mechanize浏览器下方，然后在末尾放置一个try catch。它会起作用的。一旦你尝试了注释，它就会起作用。
我认为这个错误意味着你不能使用像
br['txtParm']=x这样的语句，因为
mechanize.Browser
对象是不可索引的。