Bug 1223037

Summary:	Python raises exception on deepcopy of instance methods
Product:	Red Hat Enterprise Linux 6	Reporter:	mulhern <amulhern>
Component:	python	Assignee:	Python Maintainers <python-maint>
Status:	CLOSED ERRATA	QA Contact:	Branislav Náter <bnater>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	6.7	CC:	amulhern, bnater, dcantrell, dkutalek, dlehman, mstuchli, ovasik, salmy, sbueno, tjeyasin, tlavigne, vtrefny
Target Milestone:	rc
Target Release:	6.7
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:	python-2.6.6-64.el6	Doc Type:	Bug Fix
Doc Text:	Cause: When using deepcopy on instance methods, a TypeError exception is thrown. Consequence: An exception TypeError is thrown, when using deepcopy on instance methods. Fix: Make deepcopy take shallow copies of functions and classes. Result: Deepcopy is now usable on instance methods.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-07-22 06:40:23 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description mulhern 2015-05-19 16:17:49 UTC

Description of problem:

Python 2.6 raises an exception on deepcopy of instance methods.

Version-Release number of selected component (if applicable):

2.6.6

How reproducible:

Always, if non-builtin instance method is explicitly deep copied.

Steps to Reproduce:
1. start python
2. type following at python prompt

>>> import uuid
>>> an_id = uuid.uuid1()
>>> import copy
>>> copy.deepcopy(an_id.get_bytes)

3. See TypeError: instancemethod expected...

Actual results:

TypeError raised

Expected results:

Deepcopy made.

Additional info:

The patch is located here: https://hg.python.org/cpython/rev/83c702c17e02/.
It landed in Python 2.7 and has remained stable since.

Comment 4 Branislav Náter 2015-06-12 16:27:50 UTC

Reproduced on python-2.6.6-52.el6:

:: [  BEGIN   ] :: Run reproducer :: actually running 'python test.py'
Traceback (most recent call last):
  File "test.py", line 5, in <module>
    copy.deepcopy(an_id.get_bytes)
  File "/usr/lib64/python2.6/copy.py", line 189, in deepcopy
    y = _reconstruct(x, rv, 1, memo)
  File "/usr/lib64/python2.6/copy.py", line 323, in _reconstruct
    y = callable(*args)
  File "/usr/lib64/python2.6/copy_reg.py", line 93, in __newobj__
    return cls.__new__(cls, *args)
TypeError: instancemethod expected at least 2 arguments, got 0
:: [   FAIL   ] :: Run reproducer (Expected 0, got 1)

Verified on python-2.6.6-64.el6:
:: [  BEGIN   ] :: Run reproducer :: actually running 'python test.py'
:: [   PASS   ] :: Run reproducer (Expected 0, got 0)

Comment 5 errata-xmlrpc 2015-07-22 06:40:23 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-1330.html