python - Jython @property 语法错误 : mismatched input '' expecting CLASS

Question

我尝试从 Jython 解释器中的文档运行这个示例:

http://www.jython.org/docs/library/functions.html

class C(object):
    def __init__(self):
        self._x = None
    @property
    def x(self):
        """I'm the 'x' property."""
        return self._x
    @x.setter
    def x(self, value):
        self._x = value
    @x.deleter
    def x(self):
        del self._x

只需输入前 4 行(直到并包括 @property)就会产生 SyntaxError:

>>> class C(object):
...     def __init__(self):
...         self._x = None
...     @property
  File "<stdin>", line 4
    @property
            ^
SyntaxError: mismatched input '' expecting CLASS

更新:我使用的是 Jython 2.5.2

这是我粘贴整个内容时发生的情况:

$ jython
Jython 2.5.2 (Debian:hg/91332231a448, Jun 3 2012, 09:02:34) 
[Java HotSpot(TM) 64-Bit Server VM (Sun Microsystems Inc.)] on java1.6.0_45
Type "help", "copyright", "credits" or "license" for more information.
>>> class C(object):
...     def __init__(self):
...         self._x = None
...     @property
  File "<stdin>", line 4
    @property
            ^
SyntaxError: mismatched input '' expecting CLASS
>>>     def x(self):
  File "<stdin>", line 1
    def x(self):
    ^
SyntaxError: no viable alternative at input '    '
>>>         """I'm the 'x' property."""
  File "<stdin>", line 1
    """I'm the 'x' property."""
    ^
SyntaxError: no viable alternative at input '        '
>>>         return self._x
  File "<stdin>", line 1
    return self._x
    ^
SyntaxError: no viable alternative at input '        '
>>>     @x.setter
  File "<stdin>", line 1
    @x.setter
    ^
SyntaxError: no viable alternative at input '    '
>>>     def x(self, value):
  File "<stdin>", line 1
    def x(self, value):
    ^
SyntaxError: no viable alternative at input '    '
>>>         self._x = value
  File "<stdin>", line 1
    self._x = value
    ^
SyntaxError: no viable alternative at input '        '
>>>     @x.deleter
  File "<stdin>", line 1
    @x.deleter
    ^
SyntaxError: no viable alternative at input '    '
>>>     def x(self):
  File "<stdin>", line 1
    def x(self):
    ^
SyntaxError: no viable alternative at input '    '
>>>         del self._x
  File "<stdin>", line 1
    del self._x
    ^
SyntaxError: no viable alternative at input '        '
>>> 

更新 2:谢谢!

对于可以控制哪个 Jython 版本的人，请升级到 2.5.3。对于那些无法控制它的人，请使用没有装饰器的旧式语法:

class C(object):
    def __init__(self):
        self._x = None
    def getx(self):
        return self._x
    def setx(self, value):
        self._x = value
    def delx(self):
        del self._x
    x = property(getx, setx, delx, "I'm the 'x' property.")

Answer 1

这是一个 jython 2.5.2 的错误，参见 this issue .

已修复在 jython 版本 2.5.3 中，尝试 2.5.3，它可以工作。