“cmd.angle” shows the angle formed between any three atoms.

cmd.angle(string name, string selection1, string selection2,
          string selection3)

def angle(name=None, selection1="(pk1)", selection2="(pk2)", 
	      selection3="(pk3)", mode=None, label=1, reset=0, 
	      zoom=0, state=0, quiet=1):

angle | api