```
In [0]: a, x, y, z = symbols('a x y z')

In [1]: expr1 = Integral(x*y*z, (x, 1, 2), (y, 1, 3))

In [2]: from sympy.utilities.codegen import Routine

In [3]: r = Routine('test', Eq(a, expr1), argument_sequence=[z, x, a, y])

In [4]: [ arg.name for arg in r.arguments ]
Out[0]: [z, x, a, y]
```