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Join Date: Jun 2007
Posts: 27
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Light Poster
Hi,
How can i create a ref to a string ? it doesn't work like lists
List : (IDs are the same!)
String : (the ID of each is different!)
So any ideas ?
How can i create a ref to a string ? it doesn't work like lists
List : (IDs are the same!)
>>> li=[1, 2, 3, 4, 5] >>> li_ref=li >>> id(li) 13545800 >>> id(li_ref) 13545800 >>> li.pop() 5 >>> li [1, 2, 3, 4] >>> id(li) 13545800 >>> li_ref [1, 2, 3, 4] >>> id(li_ref) 13545800
String : (the ID of each is different!)
>>> s="Hello, " >>> s_ref=s >>> id(s) 13553952 >>> id(s_ref) 13553952 >>> s += "World!" >>> s 'Hello, World!' >>> s_ref 'Hello, ' >>> id(s) 13560752 >>> id(s_ref) 13553952
So any ideas ?
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Join Date: Dec 2006
Posts: 468
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Posting Pro in Training
>>> a=b="test"
>>> print a
test
>>> print b
test
>>> id(a)
3084724384L
>>> id(b)
3084724384L
Or convert the string to a list and then back to a string when you are finished.
>>> print a
test
>>> print b
test
>>> id(a)
3084724384L
>>> id(b)
3084724384L
Or convert the string to a list and then back to a string when you are finished.
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Join Date: Sep 2007
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Newbie Poster
Strings are known as immutable. You cannot take a string object and change its value without creating another string, so although you can have two names refer to the same string object, when you create a new string object and assign it to one of the names, the other name is still referring to the original object.
You could embed a string in a list and have two names refer to the list. Then changing the string in the list will be seen via both names
i.e:
s1 = ["Spam"]
s2 = s1
s2[0] = "Ham"
assert s1 == ["Ham"]
- Paddy.
You could embed a string in a list and have two names refer to the list. Then changing the string in the list will be seen via both names
i.e:
s1 = ["Spam"]
s2 = s1
s2[0] = "Ham"
assert s1 == ["Ham"]
- Paddy.
Last edited by paddy3118 : Sep 8th, 2007 at 1:50 pm.
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Join Date: Jul 2006
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Posting Pro
or create a class that looks like a string:
But now this raises the question: why do you want such a thing?
Jeff
Python Syntax (Toggle Plain Text)
But now this raises the question: why do you want such a thing?
Jeff
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Join Date: Jun 2007
Posts: 27
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Light Poster
Sorry for being late,
Thanks guyz, that was helpful
Thanks guyz, that was helpful
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