Question

我是一个python noob，在我用VADER做过一些情绪分析之后，我在使用MySQLdb操作来更新表时遇到了麻烦。脚本如下所示：

#!/usr/bin/env python
from nltk.tokenize import sent_tokenize
from vaderSentiment.vaderSentiment import SentimentIntensityAnalyzer
import MySQLdb as my
try:
    db = my.connect(host="*",    
                    user="*",         
                    passwd="*",  
                    db="*")        
    cur = db.cursor()
    cur.execute("SELECT id,content FROM text where relscore >=100")
    for row in cur.fetchall():
        tableid = row[0]
        textin = row[1].rstrip('\n') + ' '
        sentences = sent_tokenize(textin)
        analyzer = SentimentIntensityAnalyzer()
        sum = 0
        count = 0
        for sentence in sentences:
            vs = analyzer.polarity_scores(sentence)
            count += 1
            sum += vs['compound']
        avg = sum / count
        cur.execute("update text set sentiment = %s where id = %s",(avg,tableid))
    db.close()

 except my.Error as e:
    print(e)

当我在没有try / except的情况下运行它时，它会按预期运行而不会出现错误，但是数据库中的值没有更新。我添加了try / except以尝试访问来自mysql的任何错误，但是我收到了语法错误

     except my.Error as e:
                         ^
 IndentationError: unindent does not match any outer indentation level

我没有得到它，因为它似乎与try的缩进级别相匹配，看起来就像我找到的示例。但就像我说我是一个菜鸟所以我可能会遗漏一些明显的东西。

我已经使用调试器验证了select语句正在运行并且正在计算avg，并且已经验证用户对db和table具有必要的权限。任何人都可以帮忙吗？

Answer 1

您必须在执行查询后（在关闭光标之前）提交更改：

cur.commit()
db.close()

对于try...except阻止：except字之前有额外的空格。

Answer 2

你有一个空格，除了my.Error为e：

删除它并重新测试

#!/usr/bin/env python
from nltk.tokenize import sent_tokenize
from vaderSentiment.vaderSentiment import SentimentIntensityAnalyzer
import MySQLdb as my
try:
    db = my.connect(host="*", user="*", passwd="*", db="*")        

    cur = db.cursor()

    cur.execute("SELECT `id`, `content` FROM text WHERE `relscore`>=100")

    for row in cur.fetchall():
        tableid = row[0]
        textin = row[1].rstrip('\n') + ' '
        sentences = sent_tokenize(textin)
        analyzer = SentimentIntensityAnalyzer()
        sum = 0
        count = 0

        for sentence in sentences:
            vs = analyzer.polarity_scores(sentence)
            count += 1
            sum += vs['compound']

        avg = sum / float(count)

        cur.execute("UPDATE text SET `sentiment` = %s WHERE `id` = %s", (avg,tableid))

    db.commit()
    cur.close()
    db.close()

except Exception as e:
    print(e)

python mysqldb表更新无法正常工作

2 个答案: