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"""

# tag::FUNC_DESCRIPTOR_DEMO[]

>>> word = Text('forward')

>>> word # <1>

Text('forward')

>>> word.reverse() # <2>

Text('drawrof')

>>> Text.reverse(Text('backward')) # <3>

Text('drawkcab')

>>> type(Text.reverse), type(word.reverse) # <4>

(<class 'function'>, <class 'method'>)

>>> list(map(Text.reverse, ['repaid', (10, 20, 30), Text('stressed')])) # <5>

['diaper', (30, 20, 10), Text('desserts')]

>>> Text.reverse.__get__(word) # <6>

<bound method Text.reverse of Text('forward')>

>>> Text.reverse.__get__(None, Text) # <7>

<function Text.reverse at 0x101244e18>

>>> word.reverse # <8>

<bound method Text.reverse of Text('forward')>

>>> word.reverse.__self__ # <9>

Text('forward')

>>> word.reverse.__func__ is Text.reverse # <10>

True

# end::FUNC_DESCRIPTOR_DEMO[]

"""

# tag::FUNC_DESCRIPTOR_EX[]

import collections

class Text(collections.UserString):

def __repr__(self):

return 'Text({!r})'.format(self.data)

def reverse(self):

return self[::-1]

# end::FUNC_DESCRIPTOR_EX[]