Look at this -- from Python 2.5.1:
>>> a = [1, 2, 3, 4, 5]
>>> for x in a:
... if x == 3:
... a.remove(x)
... print x
...
1
2
3
5
>>> a
[1, 2, 4, 5]
>>>
Sure, the resulting list is correct. But 4 is never printed during the
loop!
What I was really trying to do was this:
apps = [name for name in os.listdir(ROOT) if
os.path.isdir(os.path.join(ROOT, name))]
apptitles = {}
for name in apps:
try:
app = __import__(name)
except:
apps.remove(name)
else:
apptitles[name] = getattr(app, 'TITLE', name.title())
which worked fine, until I actually had a directory with no module in it.
Then that directory was correctly removed from the list, but the _next_
one was skipped, so its title was never assigned, which caused problems
later in the program.
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