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Merged revisions 62007 via svnmerge from 

svn+ssh://pythondev@svn.python.org/python/trunk

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  r62007 | georg.brandl | 2008-03-28 13:58:26 +0100 (Fr, 28 Mär 2008) | 2 lines

  #2502: add example how to do enum types with named tuples.
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This commit is contained in:
Martin v. Löwis 2008-03-30 20:18:05 +00:00
parent 6ff4b3ca7b
commit 72c82a4d62
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Doc/library/collections.rst
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@ -547,6 +547,16 @@ by the :mod:`csv` or :mod:`sqlite3` modules::
for emp in map(EmployeeRecord._make, cursor.fetchall()):
print(emp.name, emp.title)
Named tuples can also be used to generate enumerated constants:
.. testcode::
def enum(*names):
return namedtuple('Enum', ' '.join(names))(*range(len(names)))
Status = enum('open', 'pending', 'closed')
assert (0, 1, 2) == (Status.open, Status.pending, Status.closed)
In addition to the methods inherited from tuples, named tuples support
three additional methods and one attribute. To prevent conflicts with
field names, the method and attribute names start with an underscore.