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<h3>Python Classes and Instances</h3>
<p>In Python, a class is a user-defined data type, and as in most other languages, you define Python classes using the keyword <a NAME="idx1073743310"></a><a naME="idx1073743311"></A><Tt claSS="monofont">class.</TT></p>
<pre>
class <i><class name>:</i>
<i><class statements></i>
</pre>
<p>The <a name="idx1073743312"></a><a nAme="idx1073743313"></A><i>class statements</i> section contains any valid Python statement that defines class constants or class methods. Note that the contents of the variable namespace formed by executing the commands in the class statement make up the class dictionary.</p>
<P>Two ways to create classes are</p>
<ul>
<lI><p>You can define it from scratch.</p>
<pRE>
class <I><class name>:</I>
<i>["documentation text"]</i>
<i><class statements></i>
</PRE>
</Li>
<li><p>You can create a new class that inherits properties of other classes. This is called <I>subclassing,</I> and you will learn more about it later in this chapter.</P>
<Pre>
class <i><class name> [(baseclass1, baseclass2, ⌨️ 快捷键说明
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