Most pythonic way to truncate unicode?

I need to ... 1) Truncate long unicode (UTF-8) strings based on their length in BYTES. For example, u'\u4000\u4001\u4002 abc' has a length of 7 but takes up 13 bytes. Since u'\u4000' takes up 3 bytes, I want truncate (u'\u4000\u4001\u4002 abc',3) == u'\u4000' -- as compared to u'\u4000\u4001\u4002

Getting a path from a file object

Newbie question: Let's say I open a new file for writing in a certain path. How do I get that path back? Example: >>> f = open('/some/path/file.ext') >>> some_function(f) '/some/path/file.ext' Does some_function(f) already exist? And if not, how would I define it? -- Andrew -- http://mail.pyth