Cannot import libmariadbclient.so.18 from python

root@4cd9031401a8:/home/vagrant# dpkg -l | grep mariadb

ii  libmariadb-dev              2.3.2-2                        amd64        MariaDB Connector/C, development files

ii  libmariadb2:amd64           2.3.2-2                        amd64        MariaDB Connector/C

ii  libmariadbclient18          10.1.23+maria-1~stretch        amd64        MariaDB database client library

ii  mariadb-client-10.1         10.1.23+maria-1~stretch        amd64        MariaDB database client binaries

ii  mariadb-client-core-10.1    10.1.23+maria-1~stretch        amd64        MariaDB database core client binaries

ii  mariadb-common              10.1.23+maria-1~stretch        all          MariaDB database common files (e.g. /etc/mysql/conf.d/mariadb.cnf)

ii  mariadb-server              10.1.23+maria-1~stretch        all          MariaDB database server (metapackage depending on the latest version)

ii  mariadb-server-10.1         10.1.23+maria-1~stretch        amd64        MariaDB database server binaries

ii  mariadb-server-core-10.1    10.1.23+maria-1~stretch        amd64        MariaDB database core server files

root@4cd9031401a8:/home/vagrant# apt-cache policy python-mysqldb

python-mysqldb:

  Installed: 1.3.7-1.1

  Candidate: 1.3.7-1.1

  Version table:

 *** 1.3.7-1.1 500

        500 http://deb.debian.org/debian stretch/main amd64 Packages

        100 /var/lib/dpkg/status

root@4cd9031401a8:/home/vagrant# mysql --version

mysql  Ver 15.1 Distrib 10.1.23-MariaDB, for debian-linux-gnu (x86_64) using readline 5.

root@4cd9031401a8:/home/vagrant# apt-cache policy mariadb-common

mariadb-common:

  Installed: 10.1.23+maria-1~stretch

  Candidate: 10.1.23+maria-1~stretch

  Version table:

 *** 10.1.23+maria-1~stretch 500

        500 http://ftp.igh.cnrs.fr/pub/mariadb/repo/10.1/debian stretch/main amd64 Packages

        100 /var/lib/dpkg/status

     10.1.23-9+deb9u1 500

        500 http://deb.debian.org/debian stretch/main amd64 Packages

root@4cd9031401a8:/home/vagrant# lsb_release -av

No LSB modules are available.

Distributor ID:	Debian

Description:	Debian GNU/Linux 9.0 (stretch)

Release:	9.0

Codename:	stretch

root@4cd9031401a8:/home/vagrant# python -c "import MySQLdb"

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "/usr/lib/python2.7/dist-packages/MySQLdb/__init__.py", line 19, in <module>

    import _mysql

ImportError: libmariadbclient.so.18: cannot open shared object file: No such file or directory

root@4cd9031401a8:/home/vagrant# python

Python 2.7.13 (default, Jan 19 2017, 14:48:08) 

[GCC 6.3.0 20170118] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> import MySQLdb

>>> print MySQLdb.__version__

1.3.10