Raymond Hettinger added the comment:
Try something like this:
if start < 0:
start += len(self)
if stop is None:
stop = len(self)
elif stop < 0:
stop += len(self)
for i in range(max(start, 0), min(stop, len(self))):
if self[i] == value:
return i
raise ValueError
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<http://bugs.python.org/issue23086>
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