On 03/20/2018 03:21 PM, Robin Becker wrote:
I don't know how I never came across this before, but there's a curious
asymmetry in the way ranges are limited
Python 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 08:06:12) [MSC v.1900 64 bit
(AMD64)] on win32
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>>> s = '0123456789'
>>> print(repr(s[-5:5]))
''
>>> print(repr(s[5:15]))
'56789'
>>>
why is the underflow start index treated so differently from the limit index
overflow? I suppose there must be some reason, but it
eludes me.
It's because in the slice [-5:5] the -5 is not trying to access an
element at an index < 0, but indicating the fifth-last element in the
sequence.
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