'Set default values for careful, warning and critical.'

def set_default_cwc(self, section, option_header=None, cwc=['50', '70', '90']):

    if (option_header is None):
        header = ''
    else:
        header = (option_header + '_')
    self.set_default(section, (header + 'careful'), cwc[0])
    self.set_default(section, (header + 'warning'), cwc[1])
    self.set_default(section, (header + 'critical'), cwc[2])
