Author ntc2
Recipients ntc2
Date 2008-03-05.00:53:14
SpamBayes Score 0.000614149
Marked as misclassified No
Message-id <1204678396.78.0.214556638013.issue2238@psf.upfronthosting.co.za>
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I have a file f1.py

$ cat f1.py
import os
(lambda **x:x)(**dict(y,y for y in ()))

and when I run it

$ python f1.py
Traceback (most recent call last):
  File "f1.py", line 1, in <module>
    import os
TypeError: 'int' object is not iterable

Notice that the TypeError exception is from the import os on line 1.
But the import isn't the problem.  The problem is the illegal
generator expression on line 2.  I.e. if

$ cat f2.py
#import os
dict(y,y for y in ())

then

$ python f2.py
  File "f2.py", line 2
    dict(y,y for y in ())
SyntaxError: Generator expression must be parenthesized if not sole argument

The mess

(lambda **x:x)(**dict(y,y for y in ()))

is a simplified version of something I had about 100 lines into a
file, but the resulting TypeError still complains about an import on
line 1, which is really confusing.

I'm using

Python 2.5.2 (r252:60911, Mar  4 2008, 14:33:51)
[GCC 3.4.4] on linux2

for python.

################################################################################

The above is probably a good enough description, but here's some more
weirdness in case it's helpful:

Some variations of f1.py cause the same error, but others don't.
E.g. if f4.py is

for c in [1]: pass
(lambda **x:x)(**dict(y,y for y in ()))

I get

Traceback (most recent call last):
  File "f4.py", line 1, in <module>
    for c in [1]: pass
TypeError: 'int' object is not iterable

as before.  But if f5.py is

for c in "1": pass
(lambda **x:x)(**dict(y,y for y in ()))

running the script results in no output and a successful run

$ echo $?
0

Finally, if f6.py is just the single line

(lambda **x:x)(**dict(y,y for y in ()))

then my 2.5.2 python has the same successful with no output result as
for f5.py, but if I run f6.py in an older

Python 2.5 (r25:51908, Oct 30 2006, 16:20:39)
[GCC 3.4.4] on linux2

python I get

Exception exceptions.SyntaxError: ('Generator expression must be
parenthesized if not sole argument', 1) in 'garbage collection' ignored
Fatal Python error: unexpected exception during garbage collection
zsh: abort (core dumped)  python f6.py

The older 2.5 python runs f5.py successfully with no output like 2.5.2 does.

I searched the bug tracker for "TypeError: 'int' object is not
iterable" and didn't find anything, so I'm assuming this bug is
unknown.  I'm sure someone will let me know if I'm mistaken =)

I'd guess the problem has to do with a bad parse.
History
Date User Action Args
2008-03-05 00:53:17ntc2setspambayes_score: 0.000614149 -> 0.000614149
recipients: + ntc2
2008-03-05 00:53:16ntc2setspambayes_score: 0.000614149 -> 0.000614149
messageid: <1204678396.78.0.214556638013.issue2238@psf.upfronthosting.co.za>
2008-03-05 00:53:15ntc2linkissue2238 messages
2008-03-05 00:53:14ntc2create