title: ImportError: No module named google.appengine.api
body: <p>when I migrate my database, i see that error.</p>
  
  <p>i did init. (python manager.py db init)</p>
  
  <p>and. migrate (python manager.py db migrate)</p>
  
  <p>i use google app engine, flask, mac, python</p>
  
  <p>what should i do?</p>
  
  <pre><code>$ python manager.py db migrate
  /Library/Python/2.7/site-packages/flask_sqlalchemy/__init__.py:839: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future.  Set it to True or False to suppress this warning.
    'SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and '
  Traceback (most recent call last):
    File "manager.py", line 3, in &lt;module&gt;
      manager.run()
    File "/Library/Python/2.7/site-packages/flask_script/__init__.py", line 412, in run
      result = self.handle(sys.argv[0], sys.argv[1:])
    File "/Library/Python/2.7/site-packages/flask_script/__init__.py", line 383, in handle
      res = handle(*args, **config)
    File "/Library/Python/2.7/site-packages/flask_script/commands.py", line 216, in __call__
      return self.run(*args, **kwargs)
    File "/Library/Python/2.7/site-packages/flask_migrate/__init__.py", line 182, in migrate
      version_path=version_path, rev_id=rev_id)
    File "/Library/Python/2.7/site-packages/alembic/command.py", line 176, in revision
      script_directory.run_env()
    File "/Library/Python/2.7/site-packages/alembic/script/base.py", line 421, in run_env
      util.load_python_file(self.dir, 'env.py')
    File "/Library/Python/2.7/site-packages/alembic/util/pyfiles.py", line 93, in load_python_file
      module = load_module_py(module_id, path)
    File "/Library/Python/2.7/site-packages/alembic/util/compat.py", line 75, in load_module_py
      mod = imp.load_source(module_id, path, fp)
    File "migrations/env.py", line 87, in &lt;module&gt;
      run_migrations_online()
    File "migrations/env.py", line 70, in run_migrations_online
      poolclass=pool.NullPool)
    File "/Library/Python/2.7/site-packages/sqlalchemy/engine/__init__.py", line 428, in engine_from_config
      return create_engine(url, **options)
    File "/Library/Python/2.7/site-packages/sqlalchemy/engine/__init__.py", line 387, in create_engine
      return strategy.create(*args, **kwargs)
    File "/Library/Python/2.7/site-packages/sqlalchemy/engine/strategies.py", line 80, in create
      dbapi = dialect_cls.dbapi(**dbapi_args)
    File "/Library/Python/2.7/site-packages/sqlalchemy/dialects/mysql/gaerdbms.py", line 68, in dbapi
      from google.appengine.api import apiproxy_stub_map
  ImportError: No module named google.appengine.api
  </code></pre>