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【Python】 Python斐波那挈数生成器

作者: / 发布于2011/1/4/ 614

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            <pre style="line-height: 150%; font-family: Verdana, Monospace; font-size: 12px; font-weight: bold; margin-right: 10px"><span style="color: #0099cc">def</span> fib<span style="color: black">(</span><span style="color: black">)</span>:
  x,y = <span style="color: #ff4500">0</span>,<span style="color: #ff4500">1</span>
  <span style="color: #0099cc">while</span> <span style="color: #0000ff">True</span>:
    <span style="color: #0099cc">yield</span> x
    x,y = y, x+y

<span style="color: #0099cc">def</span> fib<span style="color: black">(</span>n<span style="color: black">)</span>:
  <span style="font-style: italic; color: #808080">#closed form of fib. -- calculates the nth fib. number</span>
  <span style="color: #0099cc">import</span> <span style="color: blue">math</span>
  phi = <span style="color: black">(</span><span style="color: #ff4500">1</span> + <span style="color: blue">math</span>.<span style="color: black">sqrt</span><span style="color: black">(</span><span style="color: #ff4500">5</span><span style="color: black">)</span><span style="color: black">)</span>/<span style="color: #ff4500">2</span>

  <span style="color: #0099cc">return</span> <span style="color: black">(</span><span style="color: #0000ff">int</span><span style="color: black">)</span><span style="color: black">(</span><span style="color: black">(</span>phi<span style="color: #66cc66">**</span>n - <span style="color: black">(</span><span style="color: #ff4500">1</span>-phi<span style="color: black">)</span><span style="color: #66cc66">**</span>n<span style="color: black">)</span>/<span style="color: black">(</span><span style="color: blue">math</span>.<span style="color: black">sqrt</span><span style="color: black">(</span><span style="color: #ff4500">5</span><span style="color: black">)</span><span style="color: black">)</span><span style="color: black">)</span></pre>
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