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fractions with a 0 denominator

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Mark Pilgrim
2009-06-25 17:00:44 -04:00
parent f25b99bc89
commit 9cd2b43ef7
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@@ -150,12 +150,19 @@ ZeroDivisionError: int division or modulo by zero</samp></pre>
<a><samp class=p>>>> </samp><kbd class=pp>x * 2</kbd> <span class=u>&#x2462;</span></a>
<samp class=pp>Fraction(2, 3)</samp>
<a><samp class=p>>>> </samp><kbd class=pp>fractions.Fraction(6, 4)</kbd> <span class=u>&#x2463;</span></a>
<samp class=pp>Fraction(3, 2)</samp></pre>
<samp class=pp>Fraction(3, 2)</samp>
<a><samp class=p>>>> </samp><kbd class=pp>fractions.Fraction(0, 0)</kbd> <span class=u>&#x2464;</span></a>
<samp class=traceback>Traceback (most recent call last):
File "&lt;stdin>", line 1, in &lt;module>
File "fractions.py", line 96, in __new__
raise ZeroDivisionError('Fraction(%s, 0)' % numerator)
ZeroDivisionError: Fraction(0, 0)</samp></pre>
<ol>
<li>To start using fractions, import the <code>fractions</code> module.
<li>To define a fraction, create a <code>Fraction</code> object and pass in the numerator and denominator.
<li>You can perform all the usual mathematical operations with fractions. Operations return a new <code>Fraction</code> object. <code>2 * (1/3) = (2/3)</code>
<li>The <code>Fraction</code> object will automatically reduce fractions. <code>(6/4) = (3/2)</code>
<li>Python has the good sense not to create a fraction with a zero denominator.
</ol>
<h3 id=trig>Trigonometry</h3>
<p>You can also do basic trigonometry in Python.