IndexError:元组索引超出范围-字符串格式 [英] IndexError: tuple index out of range -- String formatting

问题描述

我正在做一些图像板的事情，并且尝试进行MySQL插入，但是这段代码抛出错误:

I'm making a little imageboard kind of thing, and I'm trying to do a MySQL insert, but this piece of code is throwing an error:

curs.execute("INSERT INTO posts(date,replies,title,link,text,userip,username) VALUES('{}',{},'{}','{}','{}','{}','{}');".format((self.date.isoformat(),self.replies,self.title,self.embed,self.text,self.userip,self.username)))

这是错误(在Falcon/WSGI之上运行):

And here's the error (running this on top of Falcon/WSGI):

2015-05-05 17:37:14,135 :Traceback (most recent call last):
2015-05-05 17:37:14,136 :  File "/bin/user_wsgi_wrapper.py", line 130, in __call__
2015-05-05 17:37:14,136 :    self.error_log_file.logger.exception("Error running WSGI application")
2015-05-05 17:37:14,136 :  File "/usr/lib/python2.7/logging/__init__.py", line 1185, in exception
2015-05-05 17:37:14,136 :    self.error(msg, *args, **kwargs)
2015-05-05 17:37:14,136 :  File "/usr/lib/python2.7/logging/__init__.py", line 1178, in error
2015-05-05 17:37:14,136 :    self._log(ERROR, msg, args, **kwargs)
2015-05-05 17:37:14,136 :  File "/usr/lib/python2.7/logging/__init__.py", line 1270, in _log
2015-05-05 17:37:14,137 :    record = self.makeRecord(self.name, level, fn, lno, msg, args, exc_info, func, extra)
2015-05-05 17:37:14,137 :  File "/usr/lib/python2.7/logging/__init__.py", line 1244, in makeRecord
2015-05-05 17:37:14,137 :    rv = LogRecord(name, level, fn, lno, msg, args, exc_info, func)
2015-05-05 17:37:14,137 :  File "/usr/lib/python2.7/logging/__init__.py", line 284, in __init__
2015-05-05 17:37:14,137 :    self.threadName = threading.current_thread().name
2015-05-05 17:37:14,137 :  File "/usr/lib/python2.7/threading.py", line 1160, in currentThread
2015-05-05 17:37:14,137 :    return _active[_get_ident()]
2015-05-05 17:37:14,137 :  File "/bin/user_wsgi_wrapper.py", line 122, in __call__
2015-05-05 17:37:14,138 :    app_iterator = self.app(environ, start_response)
2015-05-05 17:37:14,138 :  File "/home/isitcoldinfallschurch/.virtualenvs/myvirtualenv/local/lib/python2.7/site-packages/falcon/api.py", line 175, in __call__
2015-05-05 17:37:14,138 :    responder(req, resp, **params)
2015-05-05 17:37:14,138 :  File "./new.py", line 89, in on_post
2015-05-05 17:37:14,139 :    thispost.insertdb()
2015-05-05 17:37:14,139 :  File "./new.py", line 57, in insertdb
2015-05-05 17:37:14,140 :    curs.execute("INSERT INTO posts(date,replies,title,link,text,userip,username) VALUES('{}',{},'{}','{}','{}','{}','{}');".format((self.date.isoformat(),self.replies,self.title,self.embed,self.text,self.userip,self.username)))
2015-05-05 17:37:14,140 :IndexError: tuple index out of range

我该如何纠正?

推荐答案

您在.format输入中有额外的括号，用于执行此操作(将输入作为一个元组进行处理).

You have extra brackets in your .format input which is doing this (treating the inputs as a single tuple).

概念证明:

>>> "{}{}".format((1,2))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: tuple index out of range
>>> "{}{}".format(1,2)
'12'

---

所以代替这个

---

So instead of this

curs.execute("INSERT INTO posts(date,replies,title,link,text,userip,username) VALUES('{}',{},'{}','{}','{}','{}','{}');".format((self.date.isoformat(),self.replies,self.title,self.embed,self.text,self.userip,self.username)))

执行此操作

curs.execute("INSERT INTO posts(date,replies,title,link,text,userip,username) VALUES('{}',{},'{}','{}','{}','{}','{}');".format(self.date.isoformat(),self.replies,self.title,self.embed,self.text,self.userip,self.username))

正如@chepner在下面的注释中指出的那样，执行此操作的更好方法是使用以下内容，其中%s由游标填充，并使用作为第二个参数传递的元组执行:

As @chepner notes in the comments below, a better way to do this would be to use the below, where the %s are filled by the cursor using the tuple passed as the second argument to execute:

curs.execute("INSERT INTO posts(date,replies,title,link,text,userip,username) VALUES(%s, %s, %s, %s, %s, %s, %s);", (self.date.isoformat(), self.replies, self.title, self.embed, self.text, self.userip, self.username))

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