How to implement this mechanism:
<p>Hi<br>
i want to implement a dynamic relation mechanism with python something like:</p>

<pre><code>a:=10
b:=30
c:=a+b
print c
a+=20
print c
</code></pre>

<p>output:</p>

<pre><code>40
60
</code></pre>

<p>c is always result of a+b.<br>
so if a or b change, then c automatically updates value. i write a code in C# and do this by <code>set</code> and <code>get</code> mechanism. now want to translate it to python code for using in another program (FontLab Studio 5). I'm not so familiar with Python. does he have a <code>get,set</code> feature like C#? if not ho to implement one?  </p>
