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<div class="section" id="concrete-objects-layer">
<span id="concrete"></span><h1>Concrete Objects Layer<a class="headerlink" href="#concrete-objects-layer" title="本標題的永久連結">¶</a></h1>
<p>The functions in this chapter are specific to certain Python object types.
Passing them an object of the wrong type is not a good idea; if you receive an
object from a Python program and you are not sure that it has the right type,
you must perform a type check first; for example, to check that an object is a
dictionary, use <a class="reference internal" href="dict.html#c.PyDict_Check" title="PyDict_Check"><code class="xref c c-func docutils literal notranslate"><span class="pre">PyDict_Check()</span></code></a>. The chapter is structured like the
「family tree」 of Python object types.</p>
<div class="admonition warning">
<p class="first admonition-title">警告</p>
<p class="last">While the functions described in this chapter carefully check the type of the
objects which are passed in, many of them do not check for <em>NULL</em> being passed
instead of a valid object. Allowing <em>NULL</em> to be passed in can cause memory
access violations and immediate termination of the interpreter.</p>
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<div class="section" id="fundamental-objects">
<span id="fundamental"></span><h2>Fundamental Objects<a class="headerlink" href="#fundamental-objects" title="本標題的永久連結">¶</a></h2>
<p>This section describes Python type objects and the singleton object <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>
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<span id="numericobjects"></span><h2>Numeric Objects<a class="headerlink" href="#numeric-objects" title="本標題的永久連結">¶</a></h2>
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<span id="sequenceobjects"></span><h2>Sequence Objects<a class="headerlink" href="#sequence-objects" title="本標題的永久連結">¶</a></h2>
<p id="index-1">Generic operations on sequence objects were discussed in the previous chapter;
this section deals with the specific kinds of sequence objects that are
intrinsic to the Python language.</p>
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