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Copy a string: Difference between revisions

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Copy a string (view source)

Revision as of 09:45, 16 September 2007

48 bytes removed ,  16 years ago
Show how all copy operations return the same string
(→‎[[Python]]: Corrected "actual copy" code which doesn't, you know, actually copy.)
(Show how all copy operations return the same string)
Line 186:
'''Interpeter:''' Python 2.3, 2.4, 2.5
 
Since strings are immutable, this will notall copy anything,operations justreturn pointthe dstsame tostring. Probably the samereference string:is increased.
src = "Hello"▼
dst = src▼
 
<pre>
There's no way to actually copy a string in Python; all of the standard methods (the unconstrained index [:], copy.copy, copy.deepcopy) all return the same string object, since they're immutable.
▲ >>> src = "Hellohello"
▲ dst>>> a = src
>>> b = src[:]
>>> import copy
>>> c = copy.copy(src)
>>> d = copy.deepcopy(src)
>>> src is a is b is c is d
True
</pre>
 
==[[Ruby]]==
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