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I want to attach a list to itself and I thought this would work:
x = [1,2]
y = x.extend(x)
print y
I wanted to get back [1,2,1,2] but all I get back is the builtin None. What am I doing wrong? I’m using Python v2.6
x.extend(x)does not return a new copy, it modifies the list itself.Just print
xinstead.You can also go with
x + x