python - 将另一个类导入类python

Question

我希望能够将 A 类导入 B 类并使用 B 类中存在的函数。如下所示：

from scipy import stats
import numpy as np

class TestLearner(object):

    def __init__(self, param1 = 2):
        self.param = param1

    def train_model(self, X, y):
        slope, intercept, r_value, p_value, std_err = stats.linregress(X,y)
        self.slope = slope
        self.intercept = intercept

    def predict_new(self, X):
        y = self.intercept + self.slope * X
        return y

class Test(object):

    def __init__(self, learner):
        self.learner = learner

    def add_evidence(self, X, y):
        learner = self.learner
        slope, intercept = learner.train_model(X,y)
        self.slope = slope
        self.intercept = intercept

    def predict(self, X):
        y= self.intercept * self.slope * X
        return y

将 TestLearner 导入为 t

x_train = np.random.randn(10,3)
y_train = np.random.randn(10,)

x_test = np.random.randn(5,3)

testing = Test(learner = t.TestLearner)
testing.add_evidence(X=x_train,y= y_train)

我收到以下错误：

Traceback (most recent call last):
  File "<input>", line 40, in <module>
  File "<input>", line 26, in add_evidence
TypeError: train_model() missing 1 required positional argument: 'y'

我不明白。似乎火车模型正在寻找“自我”作为输入，我认为它是自包含在 TestLearner 类中的？

标签： pythonclass

Answer 1

为了在类中调用方法，您需要将该类初始化为一个实例，您可以在 Test 构造函数中初始化您的实例，但这仅在您将另一个类而不是实例传递给 Test() 时才有效

class Test(object):

    def __init__(self, learner):
        self.learner = learner()

    def add_evidence(self, X, y):
        learner = self.learner
        slope, intercept = learner.train_model(X,y)
        self.slope = slope
        self.intercept = intercept

    def predict(self, X):
        y= self.intercept * self.slope * X
        return y