我想处理文本文件，像这样的：
http://www.sec.gov/Archives/edgar/data/789019/000119312514289961/0001193125-14-289961.txt
如果你周围的文件中看到有类似如下：
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EXCEL
<SEQUENCE>21
<FILENAME>Financial_Report.xlsx
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
begin 644 Financial_Report.xlsx
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M==\%5V:V[3AL0EFK,#!#/3;M<+X)?YY]795A8)T>&MV-@]F$-\:&)\?OWQV=
MW4S&!O[NP6["G7/3QRBR]<[TVJ['R0S^D^TX]]KY?^?S:-+UA3XW4:Q4'M7C
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MJE!0%8JJ0F%5**X*!5:AR!I39(TILL8466.*K#%%UI@B:TR1-:;(&E-DC2FR
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这似乎是一个excel文件？ 或XBRL文档？ 那是什么 ？ 我该如何摆脱它（或“过程”不知何故？）这正好为成千上万行的，所以我想这是一些附加文件的某些环节的一些编码？ 任何想法如何应对呢？
我想在Python用BeautifulSoup：
from bs4 import BeautifulSoup
with open("textWithHtml.txt") as markup:
soup = BeautifulSoup(markup.read())
with open("processedText.txt", "w") as f:
f.write(soup.get_text().encode('utf-8'))
但并非一切都被删除，而且我注意到，在某些情况下，甚至没有所有的HTML标签被删除。有时候运行代码两次删除比被拆除首次BeautifulSoup代码在运行更多..
