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<h2 class="title"><a name="apihelper.summary"></a>4.9. 小结
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<p><tt class="filename">apihelper.py</tt> 程序和它的输出现在应该非常清晰了。
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<div class="informalexample"><pre class="programlisting"><span class='pykeyword'>
def</span> info(object, spacing=10, collapse=1):
<span class='pystring'>"""Print methods and doc strings.
Takes module, class, list, dictionary, or string."""</span>
methodList = [method <span class='pykeyword'>for</span> method <span class='pykeyword'>in</span> dir(object) <span class='pykeyword'>if</span> callable(getattr(object, method))]
processFunc = collapse <span class='pykeyword'>and</span> (<span class='pykeyword'>lambda</span> s: <span class='pystring'>" "</span>.join(s.split())) <span class='pykeyword'>or</span> (<span class='pykeyword'>lambda</span> s: s)
<span class='pykeyword'>print</span> <span class='pystring'>"\n"</span>.join([<span class='pystring'>"%s %s"</span> %
(method.ljust(spacing),
processFunc(str(getattr(object, method).__doc__)))
<span class='pykeyword'>for</span> method <span class='pykeyword'>in</span> methodList])
<span class='pykeyword'>if</span> __name__ == <span class='pystring'>"__main__"</span>:
<span class='pykeyword'>print</span> info.__doc__</pre></div>
<div class="informalexample">
<p><tt class="filename">apihelper.py</tt> 的输出：
</p><pre class="screen"><tt class="prompt">>>> </tt><span class="userinput"><span class='pykeyword'>from</span> apihelper <span class='pykeyword'>import</span> info</span>
<tt class="prompt">>>> </tt><span class="userinput">li = []</span>
<tt class="prompt">>>> </tt><span class="userinput">info(li)</span>
<span class="computeroutput">append L.append(object) -- append object to end
count L.count(value) -> integer -- return number of occurrences of value
extend L.extend(list) -- extend list by appending list elements
index L.index(value) -> integer -- return index of first occurrence of value
insert L.insert(index, object) -- insert object before index
pop L.pop([index]) -> item -- remove and return item at index (default last)
remove L.remove(value) -- remove first occurrence of value
reverse L.reverse() -- reverse *IN PLACE*
sort L.sort([cmpfunc]) -- sort *IN PLACE*; if given, cmpfunc(x, y) -> -1, 0, 1</span></pre></div>
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<p>在研究下一章前，确保你可以无困难的完成下面这些事情：</p>
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<li>用<a href="optional_arguments.html" title="4.2. 使用可选参数和命名参数">可选和命名参数</a>定义和调用函数
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<li>用 <a href="built_in_functions.html#apihelper.str.intro" title="例 4.6. str 介绍"><tt class="function">str</tt></a> 强制转换任意值为字符串形式
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<li>用 <a href="getattr.html" title="4.4. 通过 getattr 获取对象引用"><tt class="function">getattr</tt></a> 动态得到函数和其它属性的引用
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<li>扩展列表解析语法实现<a href="filtering_lists.html" title="4.5. 过滤列表">列表过滤</a></li>
<li>识别 <a href="and_or.html" title="4.6. and 和 or 的特殊性质"><tt class="literal">and-or</tt> 技巧</a>并安全地使用它
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<li>定义 <a href="lambda_functions.html" title="4.7. 使用 lambda 函数"><tt class="literal">lambda</tt> 函数</a></li>
<li><a href="lambda_functions.html#apihelper.funcassign">将函数赋值给变量</a>然后通过引用变量调用函数。我强调的已经够多了：这种思考方式对于提高对 <span class="application">Python</span> 的理解力至关重要。在本书中你会随处可见这种技术的更复杂的应用。
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<td width="30%" align="center"><br> <span class="divider">|</span> <a href="index.html#apihelper.divein" title="4.1. 概览">1</a> <span class="divider">|</span> <a href="optional_arguments.html" title="4.2. 使用可选参数和命名参数">2</a> <span class="divider">|</span> <a href="built_in_functions.html" title="4.3. 使用 type、str、dir 和其它内置函数">3</a> <span class="divider">|</span> <a href="getattr.html" title="4.4. 通过 getattr 获取对象引用">4</a> <span class="divider">|</span> <a href="filtering_lists.html" title="4.5. 过滤列表">5</a> <span class="divider">|</span> <a href="and_or.html" title="4.6. and 和 or 的特殊性质">6</a> <span class="divider">|</span> <a href="lambda_functions.html" title="4.7. 使用 lambda 函数">7</a> <span class="divider">|</span> <a href="all_together.html" title="4.8. 全部放在一起">8</a> <span class="divider">|</span> <span class="thispage">9</span> <span class="divider">|</span>
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