Testing jinja from the python interactive shell
from jinja2 import Template
tmpl = """{% if name != "Jeff" %}Nothing to see here move along{% else %} ... hello {{name}}, how are you?{% endif %}"""
template = Template(tmpl)
print template.render({"name": "Jeff"})
# hello Jeff, how are you?
print template.render({"name": "John"})
# Nothing to see here move along