[issue1733184] slice type is unhashable

[Alexander Belopolsky]

Alexander Belopolsky added the comment:

Note that L[:] and L[:] = [] are well-known idioms for making a copy of 
a list and emptying the list respectively. (For dictionaries we have 
D.copy() and D.clear().) Someone looking at x[:] or x[:] = [] should 
immediately recognize a list copy or clear operation.  Having to think 
of whether x may be a dictionary would make such code very confusing.

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<http://bugs.python.org/issue1733184>
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