[Chimera-users] Little help to write a python script

I have previously written command scripts for chimera. Now, I need to do something more complicated that, I believe, is not possible to do from the command line. This is the task: I have a list of 100 electron density maps. 1- I want to display each map, one by one. 2- Change the default threshold. 3- Save an image of the current volume. 4- Close the current volume and open the next model. Has anyone done this before? An example of a python script that can do this or something similar could help me a lot. Thanks in advance.