[ python-Bugs-1042238 ] Lib/compiler chokes on certain genexps

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Bugs item #1042238, was opened at 2004-10-07 14:35
Message generated for change (Comment added) made by mwh
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 9
Submitted By: Michael Hudson (mwh)
Assigned to: Nobody/Anonymous (nobody)
Summary: Lib/compiler chokes on certain genexps

Initial Comment:
Noticed this because test_compiler fails on _strptime
as of yesterday.

Here's what seems to be a fairly minimal example: 

f((x for x in y), 1)

The traceback is huge, but ends with:

  File
"/home/mwh/src/python/dist/src/Lib/compiler/transformer.py",
line 687, in power
    node = self.com_apply_trailer(node, elt)
  File
"/home/mwh/src/python/dist/src/Lib/compiler/transformer.py",
line 1144, in com_apply_trailer
    return self.com_call_function(primaryNode, nodelist[2])
  File
"/home/mwh/src/python/dist/src/Lib/compiler/transformer.py",
line 1169, in com_call_function
    raise SyntaxError, 'generator expression needs
parenthesis'
SyntaxError: generator expression needs parenthesis

Might be a problem in transformer.py, not really sure.

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>Comment By: Michael Hudson (mwh)
Date: 2004-10-11 14:12

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Rather more minimal example:

from compiler import transformer
transformer.parse("f((x for x in y), 1)")

The problem is in transformer.py.

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Comment By: Anthony Baxter (anthonybaxter)
Date: 2004-10-11 14:09

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Failing case, distilled down:

import compiler
a="""def foo(*x): return x
foo((a for b in [[1,2,3],[4,5,6]] for a in b),'Z')"""
compiler.compile(a,'<string>', 'exec')



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Comment By: Michael Hudson (mwh)
Date: 2004-10-11 13:07

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No.  I'm hoping jiwon (he who wrote the genexps patch) does
-- I've sent him a mail.

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Comment By: Raymond Hettinger (rhettinger)
Date: 2004-10-10 09:07

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Do you know how to fix this?

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Comment By: Michael Hudson (mwh)
Date: 2004-10-07 14:38

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Hang on, the exception is *inside* transformer.py.  Duh.

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