text: #!/usr/bin/env python3
  
  import os
  from flask import Flask, jsonify, abort, make_response, request
  from flask_marshmallow import Marshmallow
  from string import ascii_lowercase, digits
  from random import SystemRandom
  from sqlalchemy.ext.declarative import declarative_base
  from sqlalchemy import Column, Integer, String, DateTime, ForeignKey, create_engine
  from flask_sqlalchemy import SQLAlchemy
  from sqlalchemy.orm import sessionmaker
  from pymysql import cursors
  
  app = Flask(__name__)
  
  dbhost = 'localhost'
  dbport = '3306'
  dbname = 'noid'
  dbuser = os.environ['NOID_DB_USER']
  dbpassword = os.environ['NOID_DB_PASSWORD']
  db_connect_string = "{}:{}@{}:{}/{}".format(dbuser, dbpassword, dbhost, dbport, dbname)
  Base = declarative_base()
  engine = create_engine('mysql+pymysql://{}'.format(db_connect_string), pool_recycle=3600,
                         isolation_level='READ UNCOMMITTED')
  Base.metadata.create_all(engine)
  Session = sessionmaker(bind=engine)
  session = Session()
  
  
  class User(Base):
      __tablename__ = 'user'
      user_id = Column(Integer, primary_key=True)
      username = Column(String, unique=True)
      email = Column(String, unique=True)
      token = Column(String)
  
      def __repr__(self):
          return "<User(username='%s', email='%s', id = '%s')>" % (self.username, self.email, self.user_id)
  
      def get_user_profile(username):
          for user in session.query(User).filter_by(username='jjtuttle'):
              return user
  
  
  class Noid(Base):
      __tablename__ = 'noid'
      user_id = Column(Integer, primary_key=True)
      identifier = Column(String, unique=True)
      date_created =  Column(DateTime)
      date_modified = Column(DateTime)
      agent = Column(String)
      target = Column(String)
  
      def __repr__(self):
          return "<Noid(identifier='%s', created='%s', modified='%s' user='%s', " \
                 "target='%s')>" % (self.identifier, self.date_created, self.date_modified,
                                    self.user, self.target)
  
      def noid_unique(self):
          """Return TRUE if NOID is unique"""
          return True
  
      def mint_noid(self):
          noid = ''.join(SystemRandom().choice(ascii_lowercase + digits) for _ in range(10))
          if noid_unique(noid):
              return noid
          else:
              mint_noid(self)
  
  
  class Org(Base):
      __tablename__ = 'Org'
      org_id = Column(Integer, primary_key=True)
      org_name = Column(String, unique=True)
      admin = Column(Integer)
  
      def __repr__(self):
          return "<Org(org_name='%s', org_id='%s', admin='%s')>" % (self.org_name, self.org_id,
                                                                    self.admin)
  
  
  @app.route('/', methods=['GET'])
  def show_welcome():
      """Display useful information about the app"""
      return "Hello world!"
  
  
  @app.route('/noid/api/v1.0/user', methods=['GET'])
  def get_users():
      """Retrieve information about users"""
      return "get users"
  
  
  @app.route('/noid/api/v1.0/user/<username>', methods=['GET'])
  def get_profile(username):
      """Retrieve information about a specific user"""
      profile = User.get_user_profile(username)
      print(profile)
      return profile
  
  
  @app.route('/noid/api/v1.0/identifier/', methods=['GET'])
  def get_identifiers():
      """Return list of identifiers"""
      return jsonify({'identifiers': identifiers})
  
  
  @app.route('/noid/api/v1.0/identifier/<int:identifier>', methods=['GET'])
  def get_identifier_metadata(identifier):
      """Return metadata from single identifier"""
      return jsonify(identifiers[identifier])
  
  
  @app.route('/noid/api/v1.0/identifier/', methods=['POST'])
  def mint_identifier():
      """Mint and return identifier"""
      username = request.json['username']
      agent = request.json['agent']
      org = request.json['org']
      title = request.json['title']
      noid = "noid"
  
      pid = (username, agent, org, title, noid)
      db.session.add(pid)
      db.session.commit()
  
      return jsonify(pid)
  
  
  if __name__ == '__main__':
      app.run(debug=True)
  