[C++-sig] python call C++'s unicode functions?

[Raul]

void Foo(LPCWSTR str)
{
 MessageBoxW(NULL,str,L"Info",MB_OK);
}

BOOST_PYTHON_MODULE(dxui)
{
 def("Foo",Foo);
}

and i want to call the C++ function 'Foo' in the python scripts like that:
#Python Scripts
def Bar():
   Foo(u"Hello World");

and then i call the Python Function 'Bar' in the C++ source file.

but i don't know how to conver the python 'unicode' type to LPCWSTR  (the
same as
const unsigned short *).
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