Hi all of you,
I've some Vector class, which is a subclass of tuple and which is
working satisfactorily since long in different contexts. Now I've
constructed objects with attributes of Vec-type, which I wanted to
deepcopy. But that doesn't work, because I can't (deep)copy Vec-s:
>>> from copy import deepcopy
>>> class Vec(tuple):
def __new__(cls, x, y):
return tuple.__new__(cls, (x,y))
def __abs__(self):
return (self[0]**2+self[1]**2)**0.5
## more methods ...
>>> a=Vec(3,4)
>>> abs(a)
5.0
>>> b = deepcopy(a)
Traceback (most recent call last):
File "<pyshell#13>", line 1, in -toplevel-
b = deepcopy(a)
File "C:\Python24\lib\copy.py", line 204, in deepcopy
y = _reconstruct(x, rv, 1, memo)
File "C:\Python24\lib\copy.py", line 336, in _reconstruct
y = callable(*args)
File "C:\Python24\lib\copy_reg.py", line 92, in __newobj__
return cls.__new__(cls, *args)
TypeError: __new__() takes exactly 3 arguments (2 given)
Explanation? Remedy? Bug? Workaround?
Regards,
Gregor
--
Gregor Lingl
Reisnerstrasse 3/19
A-1030 Wien
Telefon: +43 1 713 33 98
Mobil: +43 664 140 35 27
Website: python4kids.net
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