title: SqlAlchemy connection string
body: <p>I faced very strange issue - my solution using sqlalchemy cannot connects to database. It depends on password I am using. for example, following records are working perfect:</p>
  
  <pre><code>PWD='123123123'
  USR='test_user';
  SQLALCHEMY_DATABASE_URI = 'mysql://{}:{}@localhost:3306/test_db'.format(USR, PWD)
  
  #final result is 'mysql://test_user:123123123@localhost:3306/test_db'.format(USR, PWD)
  </code></pre>
  
  <p>But when I trying to put something serious to password (like '<code>8yq+aB&amp;k$V</code>') connection failed. How to 'escape' or encode password somehow that sqlalchemy passed it to mysql succesfully?</p>