2005/5/21, Kent Johnson [EMAIL PROTECTED]:
3*[[]] makes a list with three references to the *same* list. This can cause
surprising behavior:
l=3*[[]]
l
[[], [], []]
l[0].append(1)
l
[[1], [1], [1]]
I see.
Often using a dict is a good solution to this type of question.
I
Hello,
What's the difference between [[], [], []] and 3*[[]] ?
a,b,c = [[], [], []]
id(a)
20609520
id(b)
20722000
id(c)
20721712
These ID is mutually different. But,
a,b,c = 3*[[]]
id(a)
20455728
id(b)
20455728
id(c)
20455728
These are the same.
On the other hand,
3*[[]]
[[],
