title: Unresolved reference: flask_sqlalchemy
body: <p>I have installed flask_sqlalchemy using pip.  </p>
  
  <p>I try to import it using the following line:</p>
  
  <pre><code>from flask_sqlalchemy import SQLAlchemy
  </code></pre>
  
  <p>But PyCharm does not recognize flask_sqlalchemy and when I run the code I get "NameError: name 'SQLalchemy' is not defined.</p>
  
  <p>Any insight would be appreciated.</p>