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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 check_cdtw(cls):
 """ Check whether Python C extension ``cdtw`` can be imported. Return ``True`` on failure and ``False`` on success. :rtype: bool """

        if gf.can_run_c_extension("cdtw"):
            gf.print_success(u"aeneas.cdtw    AVAILABLE")
            return False
        gf.print_warning(u"aeneas.cdtw    NOT AVAILABLE")
        gf.print_info(u"  You can still run aeneas but it will be significantly slower")
        gf.print_info(u"  Please refer to the installation documentation for details")
        return True