On 06/08/2012 20:50, Mok-Kong Shen wrote:
I ran the following code:
def xx(nlist):
print("begin: ",nlist)
nlist+=[999]
print("middle:",nlist)
nlist=nlist[:-1]
print("final: ",nlist)
u=[1,2,3,4]
print(u)
xx(u)
print(u)
and obtained the following result:
[1, 2, 3, 4]
begin: [1, 2, 3, 4]
middle: [1, 2, 3, 4, 999]
final: [1, 2, 3, 4]
[1, 2, 3, 4, 999]
As beginner I couldn't understand why the last line wasn't [1, 2, 3, 4].
Could someone kindly help?
This:
nlist+=[999]
appends to the list, making it [1, 2, 3, 4, 999].
This:
nlist=nlist[:-1]
gets a slice of the list and then binds it to the local name 'nlist'.
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