pythontips6.py

In [22]: t = (1, 2, [3, 4])                                                                                                                                                                                         
In [23]: t[2] += [30, 40]                                                                                                                                                                                           
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-25-af836a8d44a2> in <module>
----> 1 t[2] += [30, 40]

TypeError: 'tuple' object does not support item assignment

In [24]: t                                                                                                                                                                                                          
Out[24]: (1, 2, [3, 4, 30, 40])