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    <p>I believe there is no backport (Py 3's completely removed the int/long distinction, after all, but in 2.* it's here to stay;-) but it's not hard to hack your own, e.g....:</p> <pre><code>import operator def wowrange(start, stop, step=1): if step == 0: raise ValueError('step must be != 0') elif step &lt; 0: proceed = operator.gt else: proceed = operator.lt while proceed(start, stop): yield start start += step </code></pre> <p><strong>Edit</strong> it appears the OP doesn't just want looping (the normal purpose of xrange, and range in Py3), but also <code>len</code> and the <code>in</code> operator (the latter does work on the above generator, but slowly -- optimizations are possible). For such richness a class is better...:</p> <pre><code>import operator class wowrange(object): def __init__(self, start, stop=None, step=1): if step == 0: raise ValueError('step must be != 0') if stop is None: start, stop = 0, start if step &lt; 0: self.proceed = operator.gt self.l = (stop-start+step+1)//step else: self.proceed = operator.lt self.l = (stop-start+step-1)//step self.lo = min(start, stop) self.start, self.stop, self.step = start, stop, step def __iter__(self): start = self.start while self.proceed(start, self.stop): yield start start += self.step def __len__(self): return self.l def __contains__(self, x): if x == self.stop: return False if self.proceed(x, self.start): return False if self.proceed(self.stop, x): return False return (x-self.lo) % self.step == 0 </code></pre> <p>I wouldn't be surprised if there's an off-by-one or similar glitch lurking here, but, I hope this helps!</p> <p><strong>Edit</strong> again: I see indexing is ALSO required. Is it just too hard to write your own <code>__getitem__</code>? I guess it is, so here it, too, is, served on a silver plate...:</p> <pre><code> def __getitem__(self, i): if i &lt; 0: i += self.l if i &lt; 0: raise IndexError elif if i &gt;= self.l: raise IndexError return self.start + i * self.step </code></pre> <p>I don't know if 3.0 <code>range</code> supports slicing (<code>xrange</code> in recent <code>2.*</code> releases doesn't -- it used to, but that was removed because the complication was ridiculous and prone to bugs), but I guess I do have to draw a line in the sand somewhere, so I'm not going to add it;-).</p>
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    1. PO`xrange(2**100)` -> OverflowError: long int too large to convert to int
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    1. USSven Marnach
    1. USAlex Martelli
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      1. VTUpMod
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    1. COI'd like to have such niceties as `something in range()`, `len(range())`, etc. In other words I need xrange that works with large integers (py3k is exactly that).
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    2. CO`something in wowrange` will work (slowly, i.e., O(N)), though `len` won't -- easy to make a class with them though, let me edit the answer.
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      1. USAlex Martelli
    3. COWhy `raise ValueError('step must be > 0')` when step can be less than 0 just as easily as it can be greater?
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      1. USChris Lutz
 

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