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import os

toe_file = 'path\\to\\your\\file.toe'

# set environment variable
toe_env_var             = 'controller'
os.environ['STARTUP']   = toe_env_var
os.startfile(toe_file)
print("startting file with {}".format(toe_env_var))

# set environment variable
toe_env_var             = 'node'
os.environ['STARTUP']   = toe_env_var
os.startfile(toe_file)
print("startting file with {}".format(toe_env_var))