title: Odoo qweb call python method
body: <p>I want to modify the RFQ report and in that I wanted to call a python method from the Qweb report, </p>
  
  <p>here is some sample code,</p>
  
  <pre><code>&lt;span t-field ="o.my_custom_fuction()" /&gt;
  </code></pre>
  
  <p>and my python function is like</p>
  
  <pre><code>@api.model
  def my_custom_function(self):
      return "some_value"
  </code></pre>
  
  <p>But it is giving me error like 
  qwebException : "my_custom_function()" while evaluating.</p>
  
  <p>Any clue what I am missing?</p>