# http://stackoverflow.com/a/25678113/819417
def copy(data):
    if not isinstance(data, unicode):
        data = data.decode('mbcs')
    OpenClipboard(None)
    EmptyClipboard()
    hCd = GlobalAlloc(GMEM_DDESHARE, 2 * (len(data) + 1))
    pchData = GlobalLock(hCd)
    wcscpy(ctypes.c_wchar_p(pchData), data)
    GlobalUnlock(hCd)
    SetClipboardData(CF_UNICODETEXT, hCd)
    CloseClipboard()

Emoji "📋" (\U0001f400) is copied as "🐀" (\U0001f4cb), or "📋." turns to "📋" (note the period).

It works fine in Python 3.2.5.

A copy of my test program at https://gist.github.com/CTimmerman/133cb80100357dde92d8

(you swapped the unicode values: \U0001f4cb is copied as \U0001f400)

On Windows, strings have changed in 3.3. See in https://docs.python.org/3/whatsnew/3.3.html, "len() now always returns 1 for non-BMP characters".

The call to GlobalAlloc should use the number of wchar_t units, something like len(data.encode('utf-16')) + 2

Better use utf-16-le encoding:
  len(data.encode('utf-16-le')) + 2
otherwise the encoded bytes start with the \fffe BOM.