擅长:python、mysql、java
<blockquote>
<p>Variables spring into existence by being assigned a value, and they
are automatically destroyed when they go out of scope.</p>
</blockquote>
<p>对于对象,可以在运行时动态添加新字段。请注意,这不会更改类描述。仅当前实例。你知道吗</p>
<pre><code>class A:
def __init__( self ):
pass
a = A()
a.description = "whyyy"
print a.description
b = A()
print b.description # Should return an error
</code></pre>