Hi -- after updating my CVS tree today with Python 2.1a1, i ran
the tests and test_inspect failed. This revealed that the format
of code.co_varnames has changed. At first i tried to update the
inspect.py module to check the Python version number and track the
change, but now i believe this is actually symptomatic of a real
interpreter problem.
Consider the function:
def f(a, (b, c), *d):
x = 1
print a, b, c, d, x
Whereas in Python 1.5.2:
f.func_code.co_argcount = 2
f.func_code.co_nlocals = 6
f.func_code.co_names = ('x', 'a', 'b', 'c', 'd')
f.func_code.co_varnames = ('a', '.2', 'd', 'b', 'c', 'x')
In Python 2.1a1:
f.func_code.co_argcount = 2
f.func_code.co_nlocals = 6
f.func_code.co_names = ('b', 'c', 'x', 'a', 'd')
f.func_code.co_varnames = ('a', '.2', 'b', 'c', 'd', 'x')
Notice how the ordering of the variable names has changed.
I went and looked at the CO_VARARGS clause in eval_code2 to
see if it put the varargs and kwdict arguments in different
slots, but it appears unchanged! It still puts varargs at
locals[co_argcount] and kwdict at locals[co_argcount + 1].
Please try:
>>> def f(a, (b, c), *d):
... x = 1
... print a, b, c, d, x
...
>>> f(1, (2, 3), 4)
1 2 3
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "<stdin>", line 3, in f
UnboundLocalError: local variable 'd' referenced before assignment
>>>
In Python 1.5.2, this prints "1 2 3 (4,)" as expected.
I only have 1.5.2 and 2.1a1 to test. I hope this problem
isn't present in 2.0...
Note that test_inspect was the only test to fail! It might be the
only test that checks anonymous and *varargs at the same time.
(Yet another reason to put inspect in the core...)
I did recently check in additions to test_extcall that made the
test much beefier -- but that only tested combinations of regular,
keyword, varargs, and kwdict arguments; it neglected to test
anonymous (tuple) arguments as well.
-- ?!ng
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