为什么我得到TypeError：需要一个整数？

Question

这是我在追踪呼叫显示错误代码片段：

def categorize(title): 
    with conn: 
     cur= conn.cursor() 
     title_str= str(title) 
     title_words= re.split('; |, |\*|\n',title_str) 
     key_list= list(dictionary.keys()) 
     flag2= 1 
     for word in title_words: 
     title_letters= list(word) 
     flag1= 1 
     for key in key_list: 
      if key==title_letters[0]: 
       flag1= 0 
       break 

     if flag1== 0: 

     start=dictionary.get(title_letters[0]) 
     end= next_val(title_letters[0]) 

     for i in xrange (start,end): 
      if word==transfer_bag_of_words[i]: 
       flag2= 0 
       break 

     if flag2== 0: 
     cur.execute("select Id from articles where title=title") 
     row_id= cur.fetchone() 
     value= (row_id,'1') 
     s= str(value) 
     f.write(s) 
     f.write("\n") 
     break 

    return 


def next_val(text): 
    for i,v in enumerate(keyList): 
     if text=='t': 
     return len(transfer_bag_of_words) 
     elif v==text: 
     return dictionary[keyList[i+1]] 

这是回溯电话：

Traceback (most recent call last): 
File "categorize_words.py", line 93, in <module> 
query_database() 
File "categorize_words.py", line 45, in query_database 
categorize(row) 
File "categorize_words.py", line 67, in categorize 
for i in xrange (start,end): 
TypeError: an integer is required 

我没有这里给出的整个代码。但我会解释我正在尝试做什么。我试图从sqlite数据库中导入一个特定的字段，并检查字段中的单个字是否与我的程序中已有的特定字符相匹配。我已经对这些单词进行了简单的分类，并且使用python字典为它的索引分配了每一个新字母的开头。我已经这样做了，每当我检查字词袋中的字时，我就不必循环整个单词。相反，我可以从这个词的第一个字母的索引开始循环。

我检查过，字典中get（）的返回类型是int，函数nextVal也应该返回一个int，因为len（）和dictionary [keylist [i + 1]]都是int类型。

请帮忙。

编辑

这是我的全部代码：

import sqlite3 as sql 
import re 

conn= sql.connect('football_corpus/corpus2.db') 

transfer_bag_of_words=['transfer','Transfer','transfers','Transfers','deal','signs','contract','rejects','bid','rumours','swap','moves', 
        'negotiation','negotiations','fee','subject','signings','agreement','personal','terms','pens','agent','in','for', 
        'joins','sell','buy','confirms','confirm','confirmed','signing','renew','joined','hunt','excited','move','sign', 
        'loan','loaned','loans','switch','complete','offer','offered','interest','price','tag','miss','signed','sniffing', 
        'remain','plug','pull','race','targeting','targets','target','eye','sale','clause','rejected', 
        'interested'] 

dictionary={} 
dictionary['a']=0; 
keyList=[] 
f= open('/home/surya/Twitter/corpus-builder/transfer.txt','w') 

def map_letter_to_pos(): 
    pos=0 
    transfer_bag_of_words.sort() 
    for word in transfer_bag_of_words: 
     flag=1 
     letters= list(word) 
     key_list= list(dictionary.keys()) 
     for key in key_list: 
     if key==letters[0]: 
      flag=0 
      break 

     if flag==1: 
     dictionary[letters[0]]=pos 
     pos+=1 
     else: 
     pos+=1 

    keyList= sorted(dictionary.keys()) 

def query_database(): 
    with conn: 
     cur= conn.cursor() 
     cur.execute("select title from articles") 
     row_titles= cur.fetchall() 

     for row in row_titles: 
     categorize(row) 

def categorize(title): 
    with conn: 
     cur= conn.cursor() 
     title_str= str(title) 
     title_words= re.split('; |, |\*|\n',title_str) 
     key_list= list(dictionary.keys()) 
     flag2= 1 
     for word in title_words: 
     title_letters= list(word) 
     flag1= 1 
     for key in key_list: 
      if key==title_letters[0]: 
       flag1= 0 
       break 

     if flag1== 0: 

     start=dictionary.get(title_letters[0]) 
     end= next_val(title_letters[0]) 

     for i in xrange (start,end): 
      if word==transfer_bag_of_words[i]: 
       flag2= 0 
       break 

     if flag2== 0: 
     cur.execute("select Id from articles where title=title") 
     row_id= cur.fetchone() 
     value= (row_id,'1') 
     s= str(value) 
     f.write(s) 
     f.write("\n") 
     break 

    return 


def next_val(text): 
    for i,v in enumerate(keyList): 
     if text=='t': 
     return len(transfer_bag_of_words) 
     elif v==text: 
     return dictionary[keyList[i+1]] 

if __name__=='__main__': 
    map_letter_to_pos() 
    query_database() 

这是下载链接到数据库文件http://wikisend.com/download/702374/corpus2.db

Answer 1

map_letter_to_pos试图修改全局变量密钥列表没有具体说明作为全局变量，因此它只修改keyList的本地副本，然后丢弃它。这会导致next_val无法迭代，所以它永远不会到达if elif，并返回None。

end = None 
range(start,end) # None is not an int