Just like below: In [1]: a = ([], [])
In [2]: a[0].append(1) In [3]: a Out[3]: ([1], []) In [4]: a[0] += [1] --------------------------------------------------------------------------- TypeError Traceback (most recent call last) <ipython-input-4-ea29ca190a4d> in <module>() ----> 1 a[0] += [1] TypeError: 'tuple' object does not support item assignment In [5]: a Out[5]: ([1, 1], []) no problem, there is an exception. But a is still changed. is this a bug, or could anyone explain it? thanks. -- Best regards. /********************************** google+: +liuerfire <http://gplus.to/onepiece> twitter: @liuerfire<https://twitter.com/#!/liuerfire> 蛋疼不蛋疼的都可以试着点一下~^_^~ <http://db.tt/YGEdRM0> ***********************************/
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