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help(sage.functions)
Help on package sage.functions in sage: NAME sage.functions FILE /projects/sage/sage-6.9/local/lib/python2.7/site-packages/sage/functions/__init__.py PACKAGE CONTENTS airy all bessel exp_integral generalized hyperbolic hypergeometric jacobi log min_max orthogonal_polys other piecewise prime_pi special spike_function transcendental trig wigner
import scipy.special scipy.special.k0(1)
0.42102443824070823
# there's a lot here len(scipy.special.__all__)
319

MP math provides arbitrary precision special functions: http://mpmath.org/doc/current/functions/index.html

import mpmath mpmath.mp.dps = 50 mpmath.hankel1(2, pi)
mpc(real='0.48543393263150910970549571618318923785195258069868956', imag='-0.099900713929027878773490295584186552327642644463450667')