Get Coordinates II

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from pymol import cmd
from pymol import stored

stored.xyz = []
cmd.iterate_state(1,"pept","stored.xyz.append([x,y,z])")

# at this point, stored.xyz is a native Python array holding
# the coordinates, which you can modify as required

stored.xyz = map(lambda v:[-v[1],v[0],v[2]],stored.xyz)

# and now you can update the internal coordinate sets

cmd.alter_state(1,"pept","(x,y,z)=stored.xyz.pop(0)")