42 lines
1.1 KiB
Python
42 lines
1.1 KiB
Python
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"""
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# tag::FUNC_DESCRIPTOR_DEMO[]
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>>> word = Text('forward')
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>>> word # <1>
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Text('forward')
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>>> word.reverse() # <2>
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Text('drawrof')
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>>> Text.reverse(Text('backward')) # <3>
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Text('drawkcab')
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>>> type(Text.reverse), type(word.reverse) # <4>
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(<class 'function'>, <class 'method'>)
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>>> list(map(Text.reverse, ['repaid', (10, 20, 30), Text('stressed')])) # <5>
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['diaper', (30, 20, 10), Text('desserts')]
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>>> Text.reverse.__get__(word) # <6>
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<bound method Text.reverse of Text('forward')>
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>>> Text.reverse.__get__(None, Text) # <7>
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<function Text.reverse at 0x101244e18>
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>>> word.reverse # <8>
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<bound method Text.reverse of Text('forward')>
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>>> word.reverse.__self__ # <9>
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Text('forward')
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>>> word.reverse.__func__ is Text.reverse # <10>
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True
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# end::FUNC_DESCRIPTOR_DEMO[]
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"""
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# tag::FUNC_DESCRIPTOR_EX[]
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import collections
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class Text(collections.UserString):
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def __repr__(self):
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return 'Text({!r})'.format(self.data)
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def reverse(self):
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return self[::-1]
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# end::FUNC_DESCRIPTOR_EX[]
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