title: TypeError: Column() got an unexpected keyword argument 'primary_key'
body: <pre><code>class Contacts(db.Model):
      """
      sno, name, email, phone_num, msg, date
      """
      sno = db.Column(db.Integer, primary_key=True)
      name = db.Column(db.String(80), nullable=False)
      email = db.Column(db.String(20), nullable=False)
      phone_num = db.Column(db.String(12), nullable=False)
      msg = db.Column(db.String(120), nullable=False)
      date = db.Column(db.String(12), nullable=True)
  </code></pre>
  
  <blockquote>
    <p>Traceback (most recent call last):
          File "C:/Users/rithi/Flask_Blog/main.py", line 11, in 
            class Contacts(db.Model):
          File "C:/Users/rithi/Flask_Blog/main.py", line 15, in Contacts
            sno = db.Column(db.Integer, primary_key=True)
        TypeError: Column() got an unexpected keyword argument 'primary_key'</p>
  </blockquote>