"Internal Python error in the inspect module"

[harry666t]

I was toying with IPython, and I've observed this bug:

[1]: def foo(a, (x,y,z) = (1,2,3)): print a, x, y, z
...:

[2]: foo(1,2)
ERROR: Internal Python error in the inspect module.
Below is the traceback from this internal error.

Traceback (most recent call last):
  File "/var/lib/python-support/python2.5/IPython/ultraTB.py", line 662, in text
    locals,formatvalue=var_repr))
  File "/usr/lib/python2.5/inspect.py", line 812, in formatargvalues
    specs.append(strseq(args[i], convert, join))
  File "/usr/lib/python2.5/inspect.py", line 765, in strseq
    return join(map(lambda o, c=convert, j=join: strseq(o, c, j), object))
  File "/usr/lib/python2.5/inspect.py", line 765, in <lambda>
    return join(map(lambda o, c=convert, j=join: strseq(o, c, j), object))
  File "/usr/lib/python2.5/inspect.py", line 767, in strseq
    return convert(object)
  File "/usr/lib/python2.5/inspect.py", line 809, in convert
    return formatarg(name) + formatvalue(locals[name])
KeyError: 'x'

IPython's exception reporting continues...

---------------------------------------------------------------------------
TypeError Traceback (most recent call last)

/home/harry/<ipython console> in <module>()

/home/harry/<ipython console> in foo(***failed resolving arguments***)

TypeError: 'int' object is not iterable
> <ipython console>(1)foo()

ipdb>

The regular Python interpreter just says:

>>> def foo(a, (x,y,z) = (1,2,3)):
... print a, x, y, z
...
>>> foo(1,2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 1, in foo
TypeError: 'int' object is not iterable

This seems to be related to some IPython-specific functionality, although I have no understanding of its internals... I don't know if this error even matters at all, since there's already another one related to passing wrong arguments to a function - I'm just making sure someone knows that there's badness in that "inspect" module...

[Fernando Perez (fdo.perez)]

On Thu, Jul 17, 2008 at 10:51 AM, harry666t <email address hidden> wrote:
> Public bug reported:
>
> I was toying with IPython, and I've observed this bug:
>
> [1]: def foo(a, (x,y,z) = (1,2,3)): print a, x, y, z
> ...:
>
> [2]: foo(1,2)
> ERROR: Internal Python error in the inspect module.
> Below is the traceback from this internal error.

Great, thanks! I'd never had a reproducible test to cause this
failure. Having one now makes it possible to actually track the bug
down.

Best,

f

[Neal McBurnett (nealmcb)]

I ran across this old bug when I encountered another ipython "Internal Python error in the inspect module" error, running Ubuntu Precise.

When I try the code here using ipython 0.12.1+dfsg-0ubuntu1 It fails in a different way:

----> 1 def foo(a, (x,y,z) = (1,2,3)): print a, x, y, z

TypeError: 'int' object is not iterable

So perhaps this bug should be marked as closed?

(
FYI, My error ends with File "/usr/lib/python2.7/inspect.py", line 580, in findsource
    if pat.match(lines[lnum]): break
IndexError: list index out of range
and it looks sort of like the one discussed recently at https://github.com/ipython/ipython/issues/1456
)

[Neal McBurnett (nealmcb)]

Fixed, as reported in https://github.com/ipython/ipython/issues/53