import ctypes


from ctypes.wintypes import MAX_PATH

dll = ctypes.windll.shell32
buf = ctypes.create_unicode_buffer(MAX_PATH + 1)
if dll.SHGetSpecialFolderPathW(None, buf, 0x0005, False):
    print(buf.value)
else:
    print("Failure!")

>>> os.getuid()
42
>>> os.getusername()
'slartibartfast'