Bugs item #1277718, was opened at 2005-08-31 14:10
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Category: None
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Joshua Ginsberg (jaginsberg)
Assigned to: Nobody/Anonymous (nobody)
Summary: Lambda and deepcopy
Initial Comment:
Howdy --
I have a class that has an attribute that is a
dictionary that contains an object that has a kword
argument that is a lambda. Confused yet? Simplified
example:
import copy
class Foo:
def __init__(self, fn=None):
self.fn = fn
class Bar:
d = {'foobar': Foo(fn=lambda x: x*x)}
def cp(self):
self.xerox = copy.deepcopy(self.d)
When I execute:
b = Bar()
b.cp()
Using Python version:
Python 2.3 (#1, Sep 13 2003, 00:49:11)
[GCC 3.3 20030304 (Apple Computer, Inc. build 1495)] on
darwin
I get:
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "<stdin>", line 5, in cp
File
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/copy.py",
line 179, in deepcopy
y = copier(x, memo)
File
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/copy.py",
line 270, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/copy.py",
line 179, in deepcopy
y = copier(x, memo)
File
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/copy.py",
line 307, in _deepcopy_inst
state = deepcopy(state, memo)
File
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/copy.py",
line 179, in deepcopy
y = copier(x, memo)
File
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/copy.py",
line 270, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
File
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/copy.py",
line 206, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/copy.py",
line 338, in _reconstruct
y = callable(*args)
File
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/copy_reg.py",
line 92, in __newobj__
return cls.__new__(cls, *args)
TypeError: function() takes at least 2 arguments (0 given)
I've googled for deepcopy and lambda and found somebody
else asking the same question on a LUG somewhere, but
they gave no advice and nobody else seems to have run
into this. Any ideas on what the problem is/how to get
around it? Thanks!
-jag
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