Question

我的代码需要帮助，我不知道为什么我会在第10行（def plus（self，v）:)中得到'IndentationError：意外的unindent'，有人可以帮帮我？

from itertools import combinations
df = df.groupby("b_id").apply(lambda x: list(combinations(x["a_id"], 2))).apply(pd.Series).stack()
df = df.apply(pd.Series).reset_index().groupby([0,1])["b_id"].apply(lambda x:x.values).reset_index()
df.columns = ["a_one", "a_two", "b_list"]
df["number_of_b"] = df.b_list.apply(len)

Answer 1

试试这个：

class Vector(object):

    def __init__(self, coordinates):
        try:
            if not coordinates:
                raise ValueError
            self.coordinates = tuple(coordinates)
            self.dimension = len(coordinates)
        except:
            pass #TODO domething here

    def plus(self, v):
        new_coordinates = [x + y for x, y in zip(self.coordinates, v.coordinates)]
        return Vector(new_coordinates)

    def __str__(self):
        return 'Vector: {}'.format(self.coordinates)


    def __eq__(self, v):
        return self.coordinates == v.coordinates

v = Vector([8.218, -9.341])
w = Vector([-1,129, 2.111])
print (v.plus(w))

Answer 2

在__init__函数中，您错过了except块。如果您不包含此内容，则try语句基本上无用。请务必添加except块来处理您的ValueError！

Answer 3

错误来自于您致电try时需要做的就是添加except就像这样：

try:
    if not coordinates:
            raise ValueError
        self.coordinates = tuple(coordinates)
        self.dimension = len(coordinates)
except:
    # do something here to handle error

try和except概念意味着您正在尝试在python中执行操作，但如果try范围内发生错误，那么except范围内的任何内容都将运行。

希望这会有所帮助：）

Answer 4

我会猜测并说代码应该是这样的：

class Vector(object):
    def __init__(self, coordinates):
        try:
            if not coordinates:
                raise ValueError
            self.coordinates = tuple(coordinates)
            self.dimension = len(coordinates)
        except ValueError as e:
            pass
            # Code here?#

    def plus(self, v):
        new_coordinates = [x + y for x, y in zip(self.coordinates, v.coordinates)]
        return Vector(new_coordinates)

    def __str__(self):
        return 'Vector: {}'.format(self.coordinates)


    def __eq__(self, v):
        return self.coordinates == v.coordinates

if __name__ == '__main__':
    v = Vector([8.218, -9.341])
    w = Vector([-1,129, 2.111])
    print (v.plus(w))

你提供的代码中的缩进确实是错误的，但我认为解释器期待一个'except'语句（这里只是显示通过，但你应该让它做一些事情）

Answer 5

请参阅documentation on exceptions。

class Vector(object):
    def __init__(self, coordinates):
        # try: # every try must be paired with an 'except'
        if not coordinates:
            raise ValueError
        self.coordinates = tuple(coordinates)
        self.dimension = len(coordinates)

    def plus(self, v):
        new_coordinates = [x + y for x, y in zip(self.coordinates, v.coordinates)]
        return Vector(new_coordinates)

    def __str__(self):
        return 'Vector: {}'.format(self.coordinates)


    def __eq__(self, v):
        return self.coordinates == v.coordinates

v = Vector([8.218, -9.341])
w = Vector([-1,129, 2.111])
print (v.plus(w))

Python - IndentationError

5 个答案: