Merged revisions 62007 via svnmerge from

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

........
  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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Doc/library/collections.rst

@@ -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.