Question

class Pacco:
    STATES = ('Il pacco e` stato ordinato ma non ancora spedito',
              'Il pacco e` stato spedito ma non ancora ricevuto',
              'Il pacco e` stato ricevuto')
    indice = 0
    
    def __init__(self):
        self.state = Pacco.STATES[0]
        self._succ = Pacco.STATES[1]
        self._prec = None

    def next(self):
        print(self.state)

    @property
    def state(self):
        Pacco.indice += 1
        self.state = Pacco.STATES[Pacco.indice]
        self._succ = Pacco.STATES[Pacco.indice+1]
        self._prec = Pacco.STATES[Pacco.indice-1]

在indice = 0处出现错误Unexpected indent，在行Pacco.indice += 1处出现错误

Unindent does not match any outer indentation level

然后在接下来的3行中给出错误信息

Unresolved reference 'self'...

有人可以告诉我为什么吗？

Answer 1

您混用了制表符和空格。将所有制表符转换为空格（per PEP 8），语法工作正常。

注意：Stack Overflow格式化程序将制表符转换为四个空格，因此您在帖子中看不到它，但是如果选中source，则可以。

Answer 2

首先，将所有预定义变量保留在__init__函数中。其次，self.state变量必须为self._state，因为存在一个具有相同名称的函数。第三，请参阅@wjandrea's answer以获取有关制表符和空格格式的建议。代码应如下所示：

class Pacco:
    
    def __init__(self):
        self.STATES = ('Il pacco e` stato ordinato ma non ancora spedito',
                       'Il pacco e` stato spedito ma non ancora ricevuto',
                       'Il pacco e` stato ricevuto')
        self.indice = 0
        self._state = self.STATES[0]
        self._succ = self.STATES[1]
        self._prec = None

    def next(self):
        print(self.state)

    @property
    def state(self):
        self.indice += 1
        self._state = self.STATES[self.indice]
        self._succ = self.STATES[self.indice+1]
        self._prec = self.STATES[self.indice-1]

Answer 3

您可以使用autopep8

pip install autopep8

现在在终端中输入autopep8 <yourfile.py>并输入

看到代码现在将以正确的方式格式化

意外的缩进和其他错误

3 个答案: