A tuple in order to pass returned values ?

[Cameron Simpson]

On 07Oct2011 11:43, Jean-Michel Pichavant <jeanmichel at sequans.com> wrote:
| namedtuple sounds great (if you don't use unpacking :o) ), too bad
| it is available only from python 2.6.

It is easy enough to roll your own.

Here's some example code with several flaws (it claims tuplehood,
but is actually a list; it is not immutable; it takes a list of field
names instead of a space separated string as namedtuple does) and isn't
very tested.

But feel free to take it and adapt it:

  def NamedTupleClassFactory(*fields):
    ''' Construct classes for named tuples a bit like the named tuples
        coming in Python 2.6/3.0.
        NamedTupleClassFactory('a','b','c') returns a subclass of "list"
        whose instances have properties .a, .b and .c as references to
        elements 0, 1 and 2 respectively.
    '''
    class NamedTuple(list):
      for i in range(len(fields)):
        f=fields[i]
        exec('def getx(self): return self[%d]' % i)
        exec('def setx(self,value): self[%d]=value' % i)
        exec('%s=property(getx,setx)' % f)
    return NamedTuple

  def NamedTuple(fields,iter=()):
    ''' Return a named tuple with the specified fields.
        Useful for one-off tuples/lists.
    '''
    return NamedTupleClassFactory(*fields)(iter)

More old code:-( I can see I need to go back to that and make it
cleaner. Surely I can get rid of the exec(0s at least:-)

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

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