[issue10922] Unexpected exception when calling function_proxy.__class__.__call__(function_proxy)
Daniel Neuhäuser
report at bugs.python.org
Mon Jan 17 03:10:18 CET 2011
New submission from Daniel Neuhäuser <dasdasich at googlemail.com>:
Upon trying to create a proxy I stumbled upon this exception:
Traceback (most recent call last):
File "foo.py", line 11, in <module>
p.__class__.__call__(p)
SystemError: PyEval_EvalCodeEx: NULL globals
Investigating further led me to this code which reproduces the exception:
class Proxy(object):
def __init__(self, proxied):
self.proxied = proxied
@property
def __class__(self):
return self.proxied.__class__
def __call__(self):
return self.proxied.__call__()
p = Proxy(lambda: 1)
p.__class__.__call__(p)
I understand that `p.__class__.__call__()` expects an argument of a different type however this is not obvious from the exception itself. PyPy on the other hand raises this exception:
Traceback (most recent call last):
File "app_main.py", line 53, in run_toplevel
File "foo.py", line 11, in <module>
p.__class__.__call__(p)
TypeError: 'function' object expected, got 'Proxy' instead
Which explains the issue and is expected (at least by me) and apparently Jython raises an exception at least similar to PyPy's.
----------
components: Interpreter Core
messages: 126389
nosy: DasIch
priority: normal
severity: normal
status: open
title: Unexpected exception when calling function_proxy.__class__.__call__(function_proxy)
type: behavior
versions: Python 2.5, Python 2.6, Python 2.7, Python 3.1
_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10922>
_______________________________________
More information about the Python-bugs-list
mailing list