Numba - @cfunc

https://numba.readthedocs.io/en/stable/user/cfunc.html

INTRODUCTION

The 'numba.cfunc()' decorator creates a compiled function callable from foreign C code, using the signature of your choice.

import numpy as np
from numba import cfunc
import scipy.integrate as integrate

def integrand1(t):
    return np.exp(-t) / t**2

# integrand2 = cfunc("float64(float64)")(integrand1)

@cfunc("float64(float64)")   # passing a single signature is mandatory
def integrand2(t):
    return np.exp(-t) / t**2

# integrand2.address - callable from any foreign C or C++ library
# integrand2.ctypes - callable from Python; the integration function does not invoke
#     the Python interpreter each time it evaluates the integrand

def do_integrate(func):
    """Integrate the given function from 1.0 to +inf."""
    return integrate.quad(func, 1, np.inf)

result1 = do_integrate(integrand1)   # 105 us
result2 = do_integrate(integrand2.ctypes)   # 14 us, 7.5x faster