chap10 list 單鏈表實現

class Node:
    def __init__(self,key,next=None):
        self.key=key
        self.next=next
class LinkList:
    def __init__(self):
        self.nil=Node('error',None)
        self.nil.next=self.nil
    def insert(self,x):
        x.next=self.nil.next
        self.nil.next=x
    def delete(self,x):
        prev,cur=self.nil,self.nil.next
        while(cur!=x):
            prev,cur=cur,cur.next
            if(prev==self.nil):
                return None
        prev.next=cur.next
    def delete_key(self,x):
        prev,cur=self.nil,self.nil.next
        while cur!=self.nil and cur.key!=x:
            prev,cur=cur,cur.next
        if cur==self.nil:
            return None
        prev.next=cur.next
    def __repr__(self):
        res=''
        cur=self.nil.next
        while(cur!=self.nil):
            res+=(str(cur.key)+' ')
            cur=cur.next
        return res
l=LinkList()
for i in range(0,10):
    print(i)
    l.insert(Node(i))
print(l)
for i in range(0,10):
    l.delete_key(i)
    print(l)