title: SENDGRID: send an email using transactional template using python?
body: <p>I am trying to send an email using the transactional template, sendgrid.</p>
  
  <p>I am able to send a simple mail.</p>
  
  <pre><code>from_email = Email("useremail@gmail.com")
  subject = "Welcome"
  to_email = Email("toemail@gmail.com")
  content = ("text/plane","Text here")
  mail = Mail(from_email, subject, to_email, content)
  </code></pre>
  
  <p>I have created a template which I want to use to send emails. How can I do this?</p>
  
  <p>I was using template_id parameter and passing through the Mail(), but it's not working.</p>
  
  <pre><code>template_id = "13b8f94f-bcae-4ec6-b752-70d6cb59f932"
  </code></pre>
  
  <p>I checked the class Mail(object) which has self._template_id parameter. 
  The field in Mail() class is as follwos:</p>
  
  <pre><code>if self.template_id is not None:
      mail["template_id"] = self.template_id
  </code></pre>
  
  <p>What am I missing here?</p>
  
  <p>I just want to send a mail using the template I have created.</p>