Windows 下用记事本保存文件时有个 ANSI 编码，那么如何用 python 保存一个 ANSI 编码的文件呢？

python 中使用 mbcs 编码（Windows only）表示 ANSI:

with open('hello.txt', 'w') as f:
    f.write(u'你好'.encode('mbcs'))

执行上面的代码，就可以创建一个 ANSI 编码的文件。

ANSI == Windows 本地编码

在简体中文 Windows 系统中：ansi == gbk :

>>> u'你好'.encode('mbcs')
'\xc4\xe3\xba\xc3 ...

data is right, datas is wrong.

If you have some data in one file and then some more in another, that is not two data or two datas; it is just data.

参考

• Data or Datas? - WordReference Forums

当 MySQL 数据库的索引 key 出现重复时，就会提示类似的错误：

DatabaseError: (1061, "Duplicate key name 'abc_xxx_uniq'")

解决办法是移除重复的索引 key:

ALTER TABLE `foo`.`bar` DROP INDEX `bar_xxx_uniq`;

有个哥们总是不自觉的跟我说 IHMO，害我看得一头雾水，只好上网找一下解释了：

If you're talking about the commonly used IM/chat/e-mail abbreviation, I think you may have transposed a letter.

"imho" is an acronym for "In my humble opinion."

On the other hand, if you really are asking about "ihmo," I'm afraid I have ...

render_to_response 返回的其实也是一个 response 对象，直接使用这个 response 对象即可:

def foobar(request):
    #...
    response = render_to_response(template_name, context)
    response.set_cookie('foo', 'bar', 60 * 60 * 24)
    return response

参考

• Django: use render_to_response and set cookie