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    <p>I tried to get to the bottom of this by examining some old sources. I <em>suspected</em> that <code>randint</code> was implemented before Python's long integer: meaning that if you wanted a random number that included <code>INT_MAX</code>, you would have needed to call <code>random.randrange(0, INT_MAX + 1)</code> which would have overflowed and resulted in arguments of <code>(0, 0)</code> or <code>(0, INT_MIN)</code> depending.</p> <p>However, looking as far back as even <a href="http://www.python.org/download/releases/1.5/" rel="noreferrer">the Python 1.5.2 sources</a>, in <code>Lib/whrandom.py</code> we see:</p> <pre><code># # Get a random integer in the range [a, b] including both end points. # (Deprecated; use randrange below.) # def randint(self, a, b): return self.randrange(a, b+1) </code></pre> <p><code>whrandom.randint</code> was continued to be deprecated in <a href="http://svn.python.org/view/python/branches/release20-maint/Lib/whrandom.py?view=markup" rel="noreferrer">2.0</a>, <a href="http://svn.python.org/view/python/branches/release21-maint/Lib/whrandom.py?view=markup" rel="noreferrer">2.1</a>, <a href="http://svn.python.org/view/python/branches/release22-maint/Lib/whrandom.py?view=markup" rel="noreferrer">2.2</a>, and <a href="http://svn.python.org/view/python/branches/release23-maint/Lib/whrandom.py?view=markup" rel="noreferrer">2.3</a>; but <code>random.randint</code> was marked as deprecated in <a href="http://svn.python.org/view/python/branches/release21-maint/Lib/random.py?view=markup" rel="noreferrer">2.1</a>, although no longer marked as deprecated in <a href="http://svn.python.org/view/python/branches/release22-maint/Lib/random.py?view=markup" rel="noreferrer">2.2</a>.</p> <p>Also, <a href="http://svn.python.org/view/python/branches/release21-maint/Lib/random.py?view=markup" rel="noreferrer"><code>random.py</code> from version 2.1</a> is the first to note in <code>random.randint</code>'s docstring:</p> <pre><code>def randrange(self, start, stop=None, step=1, int=int, default=None): """Choose a random item from range(start, stop[, step]). This fixes the problem with randint() which includes the endpoint; in Python this is usually not what you want. Do not supply the 'int' and 'default' arguments. """ </code></pre> <p>The only available source older than that is <a href="http://www.python.org/download/releases/early/" rel="noreferrer">the 0.9.1 source</a>, and as far as I can tell, <code>randint</code> was not implemented at that point.</p> <p>Thus, I conclude that the reasoning for <code>randint</code> <em>including</em> the endpoint is known to only Guido himself at this point; given the docstring from Python 2.1, it sounds like the reason may have been a simple mistake.</p>
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    1. POPython: why does `random.randint(a, b)` return a range inclusive of `b`?
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    1. USMark Rushakoff
    1. USMark Rushakoff
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    1. CO+1 for making the effort to research this, with some interesting observations.
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      1. USMark Byers
    2. COYes, that is a great answer. Thanks a lot!
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      1. USDavid Wolever
    3. COMaybe the randint specification came from another language?
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