Partition integer n into n equal parts.
Partition positive n into parts all equal to 1:
abjad> mathtools.partition_integer_into_units(6)
[1, 1, 1, 1, 1, 1]
Partition negative n into parts all equal to -1:
abjad> mathtools.partition_integer_into_units(-5)
[-1, -1, -1, -1, -1]
Return empty list when n is 0:
abjad> mathtools.partition_integer_into_units(0)
[]
Raise TypeError on noninteger n:
abjad> mathtools.partition_integer_into_units(7.5)
TypeError