[Tutor] Why are these results different?

[Stephen Nelson-Smith]

I'm seeing different behaviour between code that looks to be the same.
 It obviously isn't the same, so I've misunderstood something:


>>> log_names
('access', 'varnish')
>>> log_dates
('20091105', '20091106')
>>> logs = itertools.chain.from_iterable(glob.glob('%sded*/%s*%s.gz' % (source_dir, log, date)) for log in log_names for date in log_dates)
>>> for log in logs:
...   print log
...
/Volumes/UNTITLED 1/ded1/access_log-20091105.gz
/Volumes/UNTITLED 1/ded2/access_log-20091105.gz
/Volumes/UNTITLED 1/ded3/access_log-20091105.gz
/Volumes/UNTITLED 1/ded1/access_log-20091106.gz
/Volumes/UNTITLED 1/ded2/access_log-20091106.gz
/Volumes/UNTITLED 1/ded3/access_log-20091106.gz
/Volumes/UNTITLED 1/ded1/varnishncsa.log-20091105.gz
/Volumes/UNTITLED 1/ded2/varnishncsa.log-20091105.gz
/Volumes/UNTITLED 1/ded3/varnishncsa.log-20091105.gz
/Volumes/UNTITLED 1/ded1/varnishncsa.log-20091106.gz
/Volumes/UNTITLED 1/ded2/varnishncsa.log-20091106.gz
/Volumes/UNTITLED 1/ded3/varnishncsa.log-20091106.gz

However:

for date in log_dates:
  for log in log_names:
     logs = itertools.chain.from_iterable(glob.glob('%sded*/%s*%s.gz'
% (source_dir, log, date)))

Gives me one character at a time when I iterate over logs.

Why is this?

And how, then, can I make the first more readable?

S.