If you look in the source code slightly before where the class 
UniqueFactory is defined you will see the following:

from sage_object cimport SageObject

cdef sage_version
from sage.version import version as sage_version

sage_version = sage_version.split('.')
for i in range(len(sage_version)):
    try:
        sage_version[i] = int(sage_version[i])
    except ValueError:
        pass
sage_version = tuple(sage_version)


cdef class UniqueFactory(SageObject):



So indeed it doens't expect version()

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