[PyMOL] How to hold/wait for some time?

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I use the command below, trying to display the object one by one, with 2 seconds in between. So how to "wait for 2 seconds"?


from pymol import cmd
cmd.enable('protein_1')
# how to hold for 2 seconds? 
cmd.disable('protein_1')
cmd.enable('protein_2')
# how to hold for 2 seconds?  
cmd.disable('protein_2')



Thank you!