Python中怎样初始化一个类类class？

 1 # 12-1 FP树的类定义
 2 class treeNode:
 3     def _init_(self,nameValue,numOccur,parentNode):
 4         self.name=nameValue; # 节点的名字
 5         self.count=numOccur; # 出现次数
 6         self.nodeLink=None;  # 链接相似的元素项
 7         self.parent=parentNode; # 父节点
 8         self.children={};       # 子节点
 9     def inc(self,numCoour): # 方法inc()对count变量增加给定值
10         self.count+=numOccur;
11     def disp(self,ind=1):   # 方法disp()用于将树以文本形式显示
12         print(‘ ‘*ind,self.name,‘ ‘,self.count);
13         for child in self.children.values():
14             child.disp(ind+1);

1 >>> 
2 >>> import fpGrowth;
3 >>> rootnode=treeNode(‘pyramid‘,9,None);
4 Traceback (most recent call last):
5   File "<pyshell#5>", line 1, in <module>
6     rootnode=fpGrowth.treeNode(‘pyramid‘,9,None);
7 TypeError: object() takes no parameters

1 >>> 
2 >>> import fpGrowth;
3 >>> oS=treeNode();
4 >>> rootnode=oS._init_(‘pyramid‘,9,None)
5 >>> rootnode
6 >>> type(rootnode)
7 <class ‘NoneType‘>
8 >>>