title: Python flask-cors ImportError: No module named 'flask-cors' Raspberry pi
body: <p>I'm following the flask-cors tutorial from the documentation here:
  <a href="https://pypi.python.org/pypi/Flask-Cors" rel="noreferrer">https://pypi.python.org/pypi/Flask-Cors</a></p>
  
  <p>but when i installed it on my raspberry pi and run my python app i'm getting this error</p>
  
  <p><code>Traceback (most recent call last):
    File "app.py", line 3, in &lt;module&gt;
      from flask_cors import CORS, cross_origin
  ImportError: No module named 'flask_cors'</code></p>
  
  <p>here is my python script:</p>
  
  <pre><code>from flask import Flask
  from Main import main
  from flask_cors import CORS, cross_origin    
  app = Flask(__name__)
  CORS(app)
  main = main() 
  
  @app.route('/turn' ,methods=['GET', 'OPTIONS'])
  def index():
    return main.turn()
  
  if __name__ == '__main__': 
    app.run(debug=True, host='0.0.0.0')
  </code></pre>