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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 render(filepath, context=None, **options):
 """ Compile and render given template file and return the result string. :param filepath: Template file path or '-' :param context: A dict or dict-like object to instantiate given template file :param options: Optional keyword arguments such as: - at_paths: Template search paths - at_encoding: Template encoding - at_engine: Specify the name of template engine to use explicitly or None to find it automatically anyhow. - at_cls_args: Arguments passed to instantiate template engine class - other keyword arguments passed to the template engine to render templates with specific features enabled. :return: Rendered string """

    if filepath == '-':
        return _render(sys.stdin.read(), context=context, **options)

    return _render(filepath=filepath, context=context, **options)