客户部署的python flask web应用出现上面的错误，调试发现：
sql = "select * from Users where id = %s"
cursor = db_conn.execute(sql, value)
执行上面的语句时，报此错误，google一下很多都说value这个参数应该是一个list或者tuple，改成
cursor = db_conn.execute(sql, [value])
的确是能正常运行了，但是为什么此语句为什么以前没有报错呢，我初步猜测可能是python包的版本问题，不同版本不一样，在这里我的想法得到了印证：
https://discuss.erpnext.com/t/typeerror-not-all-arguments-converted-during-string-formatting/1575/2
我们查看自己的服务器的Mysql-Python版本：
[root@app3 ~]# pip show Mysql-Python
Name: MySQL-python
Version: 1.2.3
Summary: Python interface to MySQL
Home-page: http://sourceforge.net/projects/mysql-python
Author: Andy Dustman
Author-email: adustman@users.sourceforge.net
License: GPL
Location: /usr/lib64/python2.7/site-packages
Requires:
发现时1.2.3，而客户的版本是1.2.5
于是我们需要降低版本：
[exam@iZ9483m8uxyZ ~]$ sudo pip install --upgrade MySQL-python==1.2.3
[sudo] password for exam:
Collecting Mysql-Python
Downloading http://mirrors.aliyun.com/pypi/packages/a5/e9/51b544da85a36a68debe7a7091f068d802fc515a3a202652828c73453cad/MySQL-python-1.2.5.zip (108kB)
100% |████████████████████████████████| 112kB 1.0MB/s
Complete output from command python setup.py egg_info:
sh: mysql_config: command not found
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/tmp/pip-build-Tgxxcw/Mysql-Python/setup.py", line 17, in <module>
metadata, options = get_config()
File "setup_posix.py", line 43, in get_config
libs = mysql_config("libs_r")
File "setup_posix.py", line 25, in mysql_config
raise EnvironmentError("%s not found" % (mysql_config.path,))
EnvironmentError: mysql_config not found
----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-Tgxxcw/Mysql-Python/
第二个答案适用我们的情况：
shell> yum install -y mysql-devel python-devel python-setuptools
安装上面的包之后再安装Mysql-Python
搞定收工