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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_external_account_by_display_name(resource_root, display_name, view=None):
 """ Lookup an external account by display name @param resource_root: The root Resource object. @param display_name: Account display name @param view: View @return: An ApiExternalAccount object """

  return call(resource_root.get,
      EXTERNAL_ACCOUNT_FETCH_PATH % ("accountByDisplayName", display_name,),
      ApiExternalAccount, False, params=view and dict(view=view) or None)