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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 require_app(app_name, api_style=False):
 """ Request the application to be automatically loaded. If this is used for "api" style modules, which is imported by a client application, set api_style=True. If this is used for client application module, set api_style=False. """

    iterable = (inspect.getmodule(frame[0]) for frame in inspect.stack())
    modules = [module for module in iterable if module is not None]
    if api_style:
        m = modules[2]  # skip a frame for "api" module
    else:
        m = modules[1]
    m._REQUIRED_APP = getattr(m, '_REQUIRED_APP', [])
    m._REQUIRED_APP.append(app_name)
    LOG.debug('require_app: %s is required by %s', app_name, m.__name__)