Trac broken for Python 2.3: tee not in itertools

[anonymous]

Traceback (most recent call last):
  File "C:\Python23\Scripts\trac-admin", line 21, in ?
    from trac.admin.console import run
  File "C:\Python23\Lib\site-packages\trac\admin\console.py", line 28, in ?
    from trac import perm, util, db_default
  File "C:\Python23\Lib\site-packages\trac\perm.py", line 21, in ?
    from trac.config import ExtensionOption
  File "C:\Python23\Lib\site-packages\trac\config.py", line 26, in ?
    from trac.util import sorted
  File "C:\Python23\Lib\site-packages\trac\util\__init__.py", line 28, in ?
    from itertools import tee, izip
ImportError: cannot import name tee

see also: ​http://code.djangoproject.com/browser/django/trunk/django/utils/itercompat.py?rev=4084

[Matthew Good]

Right, thanks for the reminder.

BTW itertools provides example implementations of the methods in the documentation, which is where Django got that from.

[Matthew Good]

Fixed in r4776

[tjb@…]

I applied this, and hit a separate problem, at line 97 in source:/trunk/trac/util/compat.py@4776​

  File "/usr/lib/python2.3/site-packages/trac/util/compat.py", line 97 in gen
    for i in count():
NameError: global name 'count' is not defined

I am trying to find out where count() should come from.

[tjb@…]

The following change works for me…

try:
    from itertools import tee
except ImportError:
# Need to import count!
    from itertools import count
    def tee(iterable):
        def gen(next, data={}, cnt=[0]):
            for i in count():
                if i == cnt[0]:
                    item = data[i] = next()
                    cnt[0] += 1
                else:
                    item = data.pop(i)
                yield item
        it = iter(iterable)
        return (gen(it.next), gen(it.next))

and r4776 runs correctly now.

[Matthew Good]

This was fixed by thatch in r4805.