在Python3.3下使用安装使用 xlwt3 报错解决方案

Python 的 xlwt 官网下载：

https://pypi.python.org/pypi/xlwt3/0.1.2

在安装使用时，却发现 xlwt3 出现了一个非常奇怪的错误：

Python 3.3.5 (v3.3.5:62cf4e77f785, Mar  9 2014, 10:37:12) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> import xlwt3
Traceback (most recent call last):
  File "", line 1, in 
    import xlwt3
  File "C:\ProgramFile\Python33\lib\site-packages\xlwt3\__init__.py", line 3, in 
    from .workbook import Workbook
  File "C:\ProgramFile\Python33\lib\site-packages\xlwt3\workbook.py", line 5, in 
    from .worksheet import Worksheet
  File "C:\ProgramFile\Python33\lib\site-packages\xlwt3\worksheet.py", line 7, in 
    from .row import Row
  File "C:\ProgramFile\Python33\lib\site-packages\xlwt3\row.py", line 8, in 
    from . import formula
  File "C:\ProgramFile\Python33\lib\site-packages\xlwt3\formula.py", line 6, in 
    class Formula(object):
ValueError: '__init__' in __slots__ conflicts with class variable
>>> 

解决方案如下：

打开 Python33\Lib\site-packages\xlwt3\formula.py 文件，将其中的：
__slots__ = ["__init__",  "__s", "__parser", "__sheet_refs", "__xcall_refs"]

修改为
__slots__ = [ "__s", "__parser", "__sheet_refs", "__xcall_refs"]

即可。