With gmpy2 (note that mpq=fractions, mpfr=floating-point reals):
>>> from gmpy2 import mpq
>>> mpq("1/1") ** mpq("2/3")
mpfr('1.0')
>>> mpq("-1/1") ** mpq("2/3")
mpfr('nan')
>>> mpq("0/1") ** mpq("2/3")
mpfr('0.0')
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