import simplejson
FAIHU="\xf0\x90\x8d\x86".decode('utf-8')

print simplejson.dumps(FAIHU)
print

roundtrip = simplejson.loads(simplejson.dumps(FAIHU))

print repr(roundtrip)
print roundtrip == FAIHU
print
print repr(roundtrip.encode('utf-8').decode('utf-8'))
print roundtrip.encode('utf-8').decode('utf-8') == FAIHU
print
print repr(roundtrip.encode('utf-16').decode('utf-16'))
print roundtrip.encode('utf-16').decode('utf-16') == FAIHU