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Slicing logic #1

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Slicing logic #1

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11 changes: 6 additions & 5 deletions xrange.py
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Original file line number Diff line number Diff line change
Expand Up @@ -101,19 +101,20 @@ def __getitem_slice(self, slce):
"""Return an xrange which represents the requested slce
of the sequence represented by this xrange.
"""
start, stop, step = slce.start, slce.stop, slce.step
if step == 0:
start, stop, index_step = slce.start, slce.stop, slce.step
if index_step == 0:
raise ValueError('slice step cannot be 0')

start = start or self._start
stop = stop or self._stop
step = (index_step or 1) * self._step
if start < 0:
start = max(0, start + self._len)
if stop < 0:
stop = max(start, stop + self._len)

if step is None or step > 0:
return xrange(start, stop, step or 1)
if step > 0:
return xrange(start, stop, step)
else:
rv = reversed(self)
rv._step = step
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