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Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit
(Intel)] on win32
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>>> import pstats
>>> ps = pstats.Stats("profile.log")
>>> ps.add("profile.log")
<pstats.Stats instance at 0x01358BC0>
>>> ps.print_callers()
 Random listing order was used
{method 'append' of 'list' objects} 
 <-
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "C:\Python25\lib\pstats.py", line 388, in print_callers
 self.print_call_line(width, func, callers, "<-")
 File "C:\Python25\lib\pstats.py", line 417, in print_call_line
 nc, cc, tt, ct = value
ValueError: too many values to unpack

I hit the same issue, and I think the problem is that at line 515 in
pstats.py add_callers() the two stats instead of adding them
member-wise. As a result, each time add() is called, the number of stats
associated with each func grows by 4. Then, when print_call_line() is
called by print_callers() or print_callees(), there are "too many values
to unpack" at line 417.
This change to pstats.py modifies add_callers() to add the stats
together instead of concatenating the tuples.
515c515
< new_callers[func] = caller + new_callers[func]
---
> new_callers[func] = map(lambda x,y: x+y, caller +
new_callers[func])

1315 is a duplicate of this, and I end up with a very similar solution.

Here's my patch against trunk, with one test. Please review!

Committed as r60149. Thanks for the patch!