当我尝试连接到数据库时，在 python 中执行许多错误答案

【问题标题】：getting error with execute many in python when i tried to connect to DB当我尝试连接到数据库时，在 python 中执行许多错误
【发布时间】：2017-06-24 01:28:24
【问题描述】：

我正在尝试将函数与 mysql 和 python 一起使用，但出现错误：我正在阅读一个文件 cnn.cvs 并且我想插入一个表 noticias 但我在代码中有错误。这里我分享一下代码：

import csv
import MySQLdb
mydb = MySQLdb.connect(host='localhost',
user='root',
passwd='password',
db='cnn')
cursor = mydb.cursor()
f = open('cnn.csv', 'r')
csv_data = csv.reader(f)
for row in csv_data:
cursor.execute('INSERT INTO noticias(title, \
link, pubDate )' \
'VALUES("%s", "%s", "%s")',
row)
#close the connection to the database.
mydb.commit()
cursor.close()
print ("Done")

当我执行时，结果如下：

C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-32\python.exe 
"C:\Program Files\JetBrains\PyCharm Community Edition 
2017.1.4\helpers\pydev\pydevd.py" --multiproc --qt-support --client 127.0.0.1 --port 59726 --file C:/Users/SoriyAntony/PycharmProjects/cnnbd/cnnbd
pydev debugger: process 10368 is connecting

Connected to pydev debugger (build 171.4694.38)
Traceback (most recent call last):
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-
32\lib\site-packages\MySQLdb\cursors.py", line 238, in execute
query = query % args
TypeError: not enough arguments for format string

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:\Program Files\JetBrains\PyCharm Community Edition 
2017.1.4\helpers\pydev\pydevd.py", line 1591, in <module>
globals = debugger.run(setup['file'], None, None, is_module)
File "C:\Program Files\JetBrains\PyCharm Community Edition 
2017.1.4\helpers\pydev\pydevd.py", line 1018, in run
pydev_imports.execfile(file, globals, locals)  # execute the script
File "C:\Program Files\JetBrains\PyCharm Community Edition 
2017.1.4\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile
exec(compile(contents+"\n", file, 'exec'), glob, loc)
File "C:/Users/SoriyAntony/PycharmProjects/cnnbd/cnnbd", line 17, in 
<module>
row)
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-
32\lib\site-packages\MySQLdb\cursors.py", line 240, in execute
self.errorhandler(self, ProgrammingError, str(m))
File "C:\Users\SoriyAntony\AppData\Local\Programs\Python\Python36-
32\lib\site-
packages\MySQLdb\connections.py", line 52, in defaulterrorhandler
raise errorclass(errorvalue)
_mysql_exceptions.ProgrammingError: not enough arguments for format string

Process finished with exit code 1

我正在使用 python 3.6，你知道吗？

更新： 此问题已解决：

我用

cursor.executemany()

为此及其工作。

【问题讨论】：

请修正代码格式。

标签： python database csv

【解决方案1】：

问题是从 csv 文件中读取的每一行都作为csv.reader 的字符串列表返回，您必须将列表row 转换为元组，将代码更改为：

cursor.execute('INSERT INTO noticias(title, \
link, pubDate )' \
'VALUES("%s", "%s", "%s")',
tuple(row))

更新：

确保你的mysql数据库中有noticias表，例如：

create table noticias (title Varchar(255),link varchar(255),pubDate varchar(255))

您的cnn.csv 文件包含空行，读取时会有空列表，您必须将其删除，更改您的 for 循环如下：

for row in csv_data:
    if len(row)!=0:
        cursor.execute('INSERT INTO noticias(title, link, pubDate ) VALUES("%s", "%s", "%s")',tuple(row))

【讨论】：