Python:从mysql表中选择时,元组索引必须是整数,而不是str [英] Python: tuple indices must be integers, not str when selecting from mysql table
问题描述
我有以下方法,我从表中选择所有ID,然后将它们附加到列表中并返回该列表.但是,当执行此代码时,我最终得到的元组索引必须是整数...错误.我已经附上了错误和打印内容以及我的方法:
I have following method that I select all the ids from table and append them to a list and return that list. But when execute this code I end up getting tuple indicies must be integers... error. I have attached the error and the print out along with my method:
def questionIds(con):
print 'getting all the question ids'
cur = con.cursor()
qIds = []
getQuestionId = "SELECT question_id from questions_new"
try:
cur.execute(getQuestionId)
for row in cur.fetchall():
print 'printing row'
print row
qIds.append(str(row['question_id']))
except Exception, e:
traceback.print_exc()
return qIds
打印我的方法的作用:
Database version : 5.5.10
getting all the question ids
printing row
(u'20090225230048AAnhStI',)
Traceback (most recent call last):
File "YahooAnswerScraper.py", line 76, in questionIds
qIds.append(str(row['question_id'][0]))
TypeError: tuple indices must be integers, not str
推荐答案
python标准mysql库从cursor.execute返回元组.要使用question_id字段,请使用row[0]
,而不是row['question_id']
.这些字段的显示顺序与它们在select语句中出现的顺序相同.
The python standard mysql library returns tuples from cursor.execute. To get at the question_id field you'd use row[0]
, not row['question_id']
. The fields come out in the same order that they appear in the select statement.
提取多个字段的一种不错的方法是
A decent way to extract multiple fields is something like
for row in cursor.execute("select question_id, foo, bar from questions"):
question_id, foo, bar = row
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