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    <p>Make sure that <code>food</code> is not a string, because in CPython2, <code>'-5' &lt; 0</code> is False:</p> <pre><code>&gt;&gt;&gt; '-5' &lt; 0 False </code></pre> <p>You can test if this is the problem in your code by placing an assert before the if statement:</p> <pre><code>assert not isinstance(food, basestring) if food &lt; 0: ... </code></pre> <p>If <code>food</code> is a string (or unicode), the program stop with an <code>AssertionError</code> when it reaches the <code>assert</code> statement.</p> <p>If it does turn out that <code>food</code> is a string, you will need to track down the source of the problem. When you find where <code>food</code> is being defined as a string, you can convert that string into an int using the <code>int</code> function:</p> <pre><code>food = int(...) </code></pre> <p>Of course, you could even use <code>int</code> in the condition,</p> <pre><code>if int(food) &lt; 0: </code></pre> <p>but if <code>food</code> is intended to be an <code>int</code>, then this would be a sloppy way to program.</p> <hr> <p>From <a href="http://docs.python.org/2/library/stdtypes.html#comparisons" rel="nofollow">the CPython2 docs</a>, </p> <blockquote> <p>CPython implementation detail: Objects of different types except numbers are ordered by their type names; objects of the same types that don’t support proper comparison are ordered by their address.</p> </blockquote> <p>So, since the word <code>'float'</code> comes before <code>'string'</code> alphabetically, all floats are ordered less than any string.</p> <p>In Python3, comparing objects of different type raises a TypeError, thus removing this pitfall.</p>
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    1. COim not using Cpython. food is defantely not a string.
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    2. COThen you need to help us help you by providing more information. Put `print(repr(food))` and `print(type(food))` before the `if food < 0` statement, and post the output. It would definitely help if you could post a short runnable example demonstrating the problem. Being able to do this is a fantastic skill for debugging. In the process of doing that you would either discover the source of the problem yourself, or produce something which would allow us to identify the problem immediately. However, if that is too hard, it would still help to post the code which defines `food`.
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