Handling an undefined template variable in Tornado

Question

This is a tornado template (say, in the file logout.html) I render on an error in the logout process:

  {% if logout_error %}
    Oops! The logout failed. Please         


        

Answer 1

Hacking around using locals().get() is one way to do it. Another, bit more orthodox is using try. Tornado template supports it, so you can:

{% try %}
  {% if logout_error %}
    Oops! The logout failed. Please close all open documents and try again
  {% end %}
{% except %}
{% end %}