1.) Be aware that the Python language requires you to indent the for loops with white space.
  https://www.geeksforgeeks.org/statement-indentation-and-comment-in-python/
2.) Can you make sure you are using the latest version (v1.2.20191219) and if issues persist tell me the operating system
  https://github.com/rordenlab/MRIcroGL12/releases
3.) does the script Scripting/Templates/Explode show an animation. If so, you could adapt for your usage
4.) Below is an example, notice that the lines after the for statement are indented

import gl
ksteps = 12
ktime= 100
gl.resetdefaults()
gl.loadimage('spm152')
for x in range(1, ksteps):
  gl.azimuthelevation(0+(x*12),10)
  gl.wait(ktime)