[mysqld]
basedir = {{basedir}}
datadir = {{datadir}}
port  = {{port}}
user  = {{user}}

#!/usr/bin/env python3

from jinja2 import Environment,FileSystemLoader

def render_mysql_config_file():
  #通过文件系统加载器，加载当前目录下的 my.cnf.jinja 模板文件
  env = Environment(loader=FileSystemLoader(searchpath='./'))
  tmpl = env.get_template('my.cnf.jinja')
  #给要渲染的参数指定值
  cnfs = {
    'basedir': '/usr/local/mysql/',
    'datadir': '/database/mysql/data/3306/',
    'port': 3306,
    'user'; 'mysql3306'
  }

  tmpl.globals=cnfs
  #不保存到 /etc/my.cnf 了，直接输出到 stdout
  print(tmpl.render())

if __name__ == "__main__":
  render_mysql_config_file()

python3 cnfs.py 

[mysqld]
basedir = /usr/local/mysql/
datadir = /database/mysql/data/3306/
port  = 3306
user  = mysql3306