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The hook.py file should extend the Hook class defined in resource_management/libraries/script/hook.py.  The naming convention is to name the hook class after the hook folder such as AfterInstallHook if the class is in the after-INSTALL folder.  The hook.py file must define the hook(self, env) function.  Here is an example hook:

from resource_management.libraries.script.hook import Hook

class AfterInstallHook(Hook):

  def hook(self, env):

    import params

    env.set_params(params)

    # Call any functions to set up the stack after install

if __name__ == "__main__":

  AfterInstallHook().execute()