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PropertyInOldStyleClass.py

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class OldStyle:

def __init__(self, x):

self._x = x

# Incorrect: 'OldStyle' is not a new-style class and '@property' is not supported

@property

def x(self):

return self._x

class InheritOldStyle(OldStyle):

def __init__(self, x):

self._x = x

# Incorrect: 'InheritOldStyle' is not a new-style class and '@property' is not supported

@property

def x(self):

return self._x

class NewStyle(object):

def __init__(self, x):

self._x = x

# Correct: 'NewStyle' is a new-style class and '@property' is supported

@property

def x(self):

return self._x

class InheritNewStyle(NewStyle):

def __init__(self, x):

self._x = x

# Correct: 'InheritNewStyle' inherits from a new-style class and '@property' is supported

@property

def x(self):

return self._x