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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 custom_field_rendering(context, field, *args, **kwargs):
 """ Wrapper for rendering the field via an external renderer """

    if CUSTOM_FIELD_RENDERER:
        mod, cls = CUSTOM_FIELD_RENDERER.rsplit(".", 1)
        field_renderer = getattr(import_module(mod), cls)
        if field_renderer:
            return field_renderer(field, **kwargs).render()
    return field