“feedback” changes the amount of information output by pymol.

feedback action, module, mask

action = set, enable, or disable

module = string: a space-separated list of modules or simply “all”

mask = string: a space-separated list of output categories or simply “everything”

feedback enable, all , debugging 
feedback disable, selector, warnings actions 
feedback enable, main, blather 

“feedback” alone will print a list of the available module choices

cmd.feedback | commands