擅长:python、mysql、java
<p>只有在调用^{<cd1>之后,<em>才初始化这些属性。颠倒<code>__init__</code>方法中的顺序,然后它将工作:</p>
<pre><code>def __init__(self, master):
self.frm = Frame(master)
self.frm.grid()
self.basevalue = IntVar()
self.expvalue = IntVar()
self.strvalue = StringVar()
self.buttons() # call buttons after initializing above attributes
</code></pre>