Bugs item #1520864, was opened at 2006-07-11 18:21
Message generated for change (Settings changed) made by rhettinger
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Category: Python Interpreter Core
Group: Python 2.5
Status: Open
Resolution: None
>Priority: 9
Submitted By: Anthony Tuininga (atuining)
Assigned to: Nobody/Anonymous (nobody)
Summary: unpack list of singleton tuples not unpacking
Initial Comment:
The following code works differently in Python 2.5 than
Python 2.4:
x = [(1,), (2,), (3,)]
for y, in x:
print y
In Python 2.4, this code produces the following:
1
2
3
In Python 2.5, this code produces the following:
(1,)
(2,)
(3,)
Interestingly enough the following code:
x = (1,)
y, = x
print y
produces the output
1
in both Python 2.4 and Python 2.5. I'm thinking this is
not intentional. :-)
----------------------------------------------------------------------
>Comment By: Raymond Hettinger (rhettinger)
Date: 2006-07-11 21:38
Message:
Logged In: YES
user_id=80475
Ouch. This is bad. The disassembly shows that the compiler
isn't generating the unpack_sequence opcode.
----------------------------------------------------------------------
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