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As @__AmirRoth__ says, you need something outside of EnergyPlus to do this. That could be Eppy, as in the script below.

from eppy.iddcurrent import iddcurrent
from eppy.modeleditor import IDF
from future.moves.itertools import zip_longest
from six import StringIO


iddsnippet = iddcurrent.iddtxt
iddfhandle = StringIO(iddcurrent.iddtxt)
IDF.setiddname(iddfhandle)

def adjust_coords(surface, latitude):
    coords = surface.coords

    # do what you want with the coords here

    # make the coords into a flattened list
    coords = [i for point in coords for i in point]
    # find the vertex fields
    n_vertices_index = surface.objls.index('Number_of_Vertices')
    last_item = len(surface.obj)
    first_item = n_vertices_index + 1 # X of first coordinate
    vertex_fields = surface.objls[first_item:last_item]

    # set the vertex field values
    for field, x in zip_longest(vertex_fields, coords, fillvalue=""):
        surface[field] = x


idf = IDF()
idf.initreadtxt('my_base.idf')
shading_surfaces = idf.idfobjects['SHADING:BUILDING:DETAILED']
latitude = idf.getobject('SITE:LOCATION', 'Tampa International Ap').Latitude

for surface in shading_surfaces:
    adjust_coords(surface, latitude)

idf.save('my_new.idf')