Question

我有一个测量列表，如：

[[Measurements(100, 0.3)],
[Measurements(33, 0.5)]]

然后，我有一个列表，其中包含一些包含测量列表的标准：

 [Criteria(999, [[Measurements(100, 0.3)],
                        [Measurements(33, 0.5)]])],

 [Criteria(999, [[Measurements(150, 0.3)],
                        [Measurements(35, 0.5)]])]

最后，我想提供上面的列表作为输入并执行代码：

class Measurements():
    def __init__(self, value, other):
        self.value = value
        self.other = other


class Criteria():
    def __init__(self, new_value, measurements):
        self.new_value = new_value
        self.measurements = measurements

    def method(self):

        # Here, I am iterating through all measurements
        # and replace the value according to criteria
        for idx, x in enumerate(self.measurements):
            if (self.measurements[idx].value > 20 and
                    self.measurements[idx].value < 110):

                self.measurements[idx].value = self.new_value
        return self.measurements


class Evaluate():
    def __init__(self, criteria):
        self.criteria = criteria

    def execute(self):
        criteria = self.criteria

        # Here, I am iterating through all criteria
        # and call the method from criteria
        for i, c in enumerate(criteria):
            c.method()
            return c.measurements


def main():

    criteria = [
        [Criteria(999, [[Measurements(100, 0.3)],
                        [Measurements(33, 0.5)]])],

        [Criteria(999, [[Measurements(150, 0.3)],
                        [Measurements(35, 0.5)]])]
    ]

    obs = (Evaluate(criteria).execute())


if __name__ == "__main__":
    main()

我正在接收c.method() AttributeError: 'list' object has no attribute 'method'

我希望我的结果成为新修正的测量值，所以：

[[Measurements(999, 0.3)],
[Measurements(999, 0.5)]],
[Measurements(150, 0.3)],
[Measurements(999, 0.5)]]

Answer 1

您的所有Criteria()和Measurement()对象都存储在单元素列表中，而单元素列表又存储在更大的列表中。要么考虑到这一点，要么不使用单元素嵌套列表。

我没有看到这些单元素列表的任何原因;以下定义应该使您的代码有效：

criteria = [
    Criteria(999, [Measurements(100, 0.3), Measurements(33, 0.5)]),
    Criteria(999, [Measurements(150, 0.3), Measurements(35, 0.5)]),
]

否则你将不得不每次都提取一个元素，或者使用嵌套循环：

def execute(self):
    for c in self.criteria:
        c[0].method()

或

def execute(self):
    for c_list in self.criteria:
        for c in c_list:
            c.method()

您还应该不在return循环中使用for，至少在您想要获得所有条件的衡量标准时。在列表中收集测量值，然后返回该列表。

您在self循环中也使用Criteria.method()方式太多次了。不需要enumerate()，您不需要索引来改变可变对象。

更正后的代码：

class Measurements():
    def __init__(self, value, other):
        self.value = value
        self.other = other


class Criteria():
    def __init__(self, new_value, measurements):
        self.new_value = new_value
        self.measurements = measurements

    def method(self):
        for measurement in self.measurements:
            if 20 < measurement.value < 110:
                measurement.value = self.new_value
        return self.measurements

class Evaluate():
    def __init__(self, criteria):
        self.criteria = criteria

    def execute(self):
        results = []
        for c in self.criteria:
            measurements = c.method()
            results.extend(measurements)
        return results

def main():
    criteria = [
        Criteria(999, [Measurements(100, 0.3), Measurements(33, 0.5)]),
        Criteria(999, [Measurements(150, 0.3), Measurements(35, 0.5)]),
    ]

    obs = Evaluate(criteria).execute()

＆＃39;列表＆＃39;对象没有属性＆＃39;方法＆＃39;

1 个答案: