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In [7]: l = range(5) In [8]: id(l) Out[8]: 158453516 In [9]: l = [] In [10]: id(l) Out[10]: 158096716 In [11]: l = range(5) In [12]: id(l) Out[12]: 158453516 In [13]: l[:] = [] In [14]: id(l) Out[14]: 158453516