Hi,
I read a blog written by Ned and find it is very interesting, but I am still
unclear it in some parts. In the following example, I am almost lost at the
last line:
nums = num
Could anyone explain it in a more detail to me?
Thanks,
.......................
The reason is that list implements __iadd__ like this (except in C, not Python):
class List:
def __iadd__(self, other):
self.extend(other)
return self
When you execute "nums += more", you're getting the same effect as:
nums = nums.__iadd__(more)
which, because of the implementation of __iadd__, acts like this:
nums.extend(more)
nums = nums
So there is a rebinding operation here, but first, there's a mutating
operation, and the rebinding operation is a no-op.
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