def __init__(self, rules, header=None, separator=''):
        if header:
            rule_set = [Header(header)] + list(rules)
        else:
            rule_set = list(rules)

        super(FieldSet, self).__init__(rule_set, separator=separator)
Removes trailing and leading backslashes from string
dataset/ETHPy150Open mrjoes/flask-admin/flask_admin/form/rules.py/FieldSet.__init__--crossover with--dataset/ETHPy150Open architv/harvey/harvey/harvey.py/_stripslashes