OperationalError: (2002, "Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)")
in flask, you may use that
app=Flask(__name__)
app.config["MYSQL_HOST"]="127.0.0.1 
app.config["MYSQL_USER"]="root"...
when connecting to mysql database in Django ,I get the error.

I'm sure mysql server is running.
/var/run/mysqld/mysqld.sock doesn't exist.
When I run $ find / -name *.sock -type s, I only get /tmp/mysql.sock and some other irrelevant output.
I added socket = /tmp/mysql.sock to /etc/my.cnf. And then restared mysql, exited django shell, and connected to mysql database. I still got the same error.

I searched a lot, but I still don't know how to do.
Any help is greate. Thanks in advance.
Well, I just tried some ways. And it works.
I did as follows.

Add socket = /tmp/mysql.sock .Restart the mysql server.
ln -s /tmp/mysql.sock /var/lib/mysqld/mysqld.sock

I met an another problem today. I can't login to mysql.
I'm newbie to mysql. So I guess mysql server and client use the same socket to communicate.
I add socket = /var/mysqld/mysqld.sock to [mysqld] [client] block in my.cnf  and it wokrs.