python 结巴分词哪里出错了呢

刚学python，请问这段分词代码是哪里出错了呢？

import jieba
txt = open("threekingdoms.txt","r",encoding="utf-8").read()
words = jieba.lcut(txt)
counts={}
for word in words:
    if len(word) == 1:
        continue
    else:
        counts[word]=counts.get(word,0)+1
items = list(counts.items())
items.sort(key=lambda x:x[1],reverse=True)
for i in range (15):
    word,count = items[i]
    print("{0:<10}{1:>5}".format(word,count))

运行后系统给的提示是：

File "C:\Users\ASUS\Desktop\python\jieba分词\Calthea.py", line 14, in <module>
    word,count = items[i]
IndexError: list index out of range

IndexError: list index out of range
数组越界异常。

import jieba
txt = open("threekingdoms.txt","r",encoding="utf-8").read()
words = jieba.lcut(txt)
counts={}
for word in words:
    if len(word) == 1:
        continue
    else:
        counts[word]=counts.get(word,0)+1
items = list(counts.items())
items.sort(key=lambda x:x[1],reverse=True)
for i in range (len(items)):
    word,count = items[i]
    print("{0:<10}{1:>5}".format(word,count))
 

你定义的数组items，长度不足15