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41 lines
782 B
Python
41 lines
782 B
Python
class B(object):
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def __init__(self, arg):
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print('B.__init__', arg)
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self._arg = arg
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def __str__(self):
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print('B.__str__')
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return 'B (arg={})'.format(self.arg)
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def __add__(self, other):
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print('B.__add__')
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if isinstance(other, B):
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return B(self.arg + other.arg)
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return B(self.arg + other)
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@property
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def arg(self):
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print('B.arg getter')
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return self._arg
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@arg.setter
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def arg(self, value):
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print('B.arg setter')
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self._arg = value
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b1 = B(1)
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b2 = B(2)
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b3 = b1 + b2
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print('value printing:', str(b1))
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print('value printing:', str(b2))
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print('value printing:', str(b3))
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b3.arg = 42
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b4 = b3 + 100
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# this calls `str(b4)` inside
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print('value printing:', b4)
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