[issue9213] range purports to implement the Sequence ABC, but is missing index and count methods

[Daniel Urban]

Daniel Urban <urban.dani+py at gmail.com> added the comment:

The attached patch adds the range.count and range.index methods.
Pseudocode for the two method:

def count(self, ob):
    if ob in self:
        return 1
    else:
        return 0

def index(self, ob, start=0, stop=len(self)):
    if ob in self:
        idx = (ob - self.start) // self.step
        if start < 0:
            start = start + len(self)
        if stop < 0:
            stop = stop + len(self)
        if start <= idx < stop:
            return idx
    raise ValueError("{!r} is not in range".format(ob))

----------
keywords: +patch
nosy: +durban
Added file: http://bugs.python.org/file18111/issue9213.diff

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