How can I shorten this python code analyzing a 3d grid?

Python 3, 108 107 bytes

Since the cube only contains the strings "X" and "Z", there are only two valid cube patterns. The one that starts with XZXZX... and the one that starts with ZXZXZ....

My solutions generates these 2 cubes and checks if the inputted cube is one of them.

def golf(l):L=len(l);r=range(L);return l in[[[list("XZ"*L)[(i+j+k)%2:][:L]for j in r]for k in r]for i in r]

i iterates over the possible cubes. Since the dimension is at least 2, we can reuse r instead of writing for i in(0,1).

Python 3, 60 bytes

golf=g=lambda l:all(g(a)*g(b)*(a!=b)for a,b in zip(l,l[1:]))

The function recursively decides whether an N-dimensional array is alternating by checking if:

• Any two adjacent elements are unequal
• Each element is alternating

This successfully bottoms out for the strings 'X' and 'Z' because their length is 1, so the all is taken of an empty list.

Python 3 with NumPy, 125 bytes

import numpy
def golf(a):a=numpy.array(a);return(a[:-1]!=a[1:]).all()&(a[:,:-1]!=a[:,1:]).all()&(a[:,:,:-1]!=a[:,:,1:]).all()

Python 3, 146 128 bytes

e=lambda x,y:x!=y
z=lambda f:lambda*l:all(map(f,*l))
u=lambda f,g:lambda a:z(f)(a,a[1:])&z(g)(a)
golf=u(z(z(e)),u(z(e),u(e,id)))