mkvirtualenv _virtual_env_name_
pip install -r requirements.txt
Python 3 requires the use of MySQL Connector package for connecting to MySQL databases.
pip install mysql-connector-python
To specify the use of MySQL Connector with SQLAlchemy, use database URI setting like this:
SQLALCHEMY_DATABASE_URI = 'mysql+mysqlconnector://flask_admin:flask_admin@localhost/bookmarks'
See here for details.