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<form action="{{ url_for('parse_grammar') }}" method="post">
  <p>Enter sentence:
  <p><input type=text name=sentence value="{{ sentence }}">
  <p><input type=submit value=Parse>
</form>
{% if error %}
  <p>Could not parse</p>
{% elif grammar != None %}
  <p>{{ grammar }}</p>
  <ul class="grammar_tree">
  {%- for item in grammar recursive %}
    <li>{{ item[0] }}
    {%- if isinstance(item[1], str) %}
      {{ item[1] }}
    {%- else %}
      <ul class="submenu">{{ loop(item[1]) }}</ul>
    {%- endif %}</li>
  {%- endfor %}
</ul>

{% endif %}

2017-02-09 22:37:40,822 :[2017-02-09 22:37:40,814] ERROR in app: Exception on /grammar/ [POST]
2017-02-09 22:37:40,823 :Traceback (most recent call last):
2017-02-09 22:37:40,823 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/app.py", line 1982, in wsgi_app
2017-02-09 22:37:40,823 :    response = self.full_dispatch_request()
2017-02-09 22:37:40,823 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/app.py", line 1614, in full_dispatch_request
2017-02-09 22:37:40,823 :    rv = self.handle_user_exception(e)
2017-02-09 22:37:40,823 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/app.py", line 1517, in handle_user_exception
2017-02-09 22:37:40,823 :    reraise(exc_type, exc_value, tb)
2017-02-09 22:37:40,823 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise
2017-02-09 22:37:40,823 :    raise value
2017-02-09 22:37:40,824 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/app.py", line 1612, in full_dispatch_request
2017-02-09 22:37:40,824 :    rv = self.dispatch_request()
2017-02-09 22:37:40,824 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/app.py", line 1598, in dispatch_request
2017-02-09 22:37:40,824 :    return self.view_functions[rule.endpoint](**req.view_args)
2017-02-09 22:37:40,824 :  File "./hello.py", line 78, in parse_grammar
2017-02-09 22:37:40,824 :    return render_template('parse_grammar.html', grammar=grammar, sentence=sentence, error=error)
2017-02-09 22:37:40,824 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/templating.py", line 134, in render_template
2017-02-09 22:37:40,824 :    context, ctx.app)
2017-02-09 22:37:40,824 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/templating.py", line 116, in _render
2017-02-09 22:37:40,824 :    rv = template.render(context)
2017-02-09 22:37:40,824 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/jinja2/environment.py", line 1008, in render
2017-02-09 22:37:40,824 :    return self.environment.handle_exception(exc_info, True)
2017-02-09 22:37:40,824 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/jinja2/environment.py", line 780, in handle_exception
2017-02-09 22:37:40,825 :    reraise(exc_type, exc_value, tb)
2017-02-09 22:37:40,825 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/jinja2/_compat.py", line 37, in reraise
2017-02-09 22:37:40,825 :    raise value.with_traceback(tb)
2017-02-09 22:37:40,825 :  File "/home/tess/mysite/templates/parse_grammar.html", line 11, in top-level template code
2017-02-09 22:37:40,826 :    {%- for item in grammar recursive %}
2017-02-09 22:37:40,826 :  File "/home/tess/mysite/templates/parse_grammar.html", line 13, in template
2017-02-09 22:37:40,826 :    {%- if isinstance(item[1], str) %}
2017-02-09 22:37:40,826 :jinja2.exceptions.UndefinedError: 'isinstance' is undefined
2017-02-09 22:37:40,975 :[2017-02-09 22:37:40,975] ERROR in app: Exception on /grammar/ [POST]
2017-02-09 22:37:40,975 :Traceback (most recent call last):
2017-02-09 22:37:40,975 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/app.py", line 1982, in wsgi_app
2017-02-09 22:37:40,975 :    response = self.full_dispatch_request()
2017-02-09 22:37:40,976 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/app.py", line 1614, in full_dispatch_request
2017-02-09 22:37:40,976 :    rv = self.handle_user_exception(e)
2017-02-09 22:37:40,976 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/app.py", line 1517, in handle_user_exception
2017-02-09 22:37:40,976 :    reraise(exc_type, exc_value, tb)
2017-02-09 22:37:40,976 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise
2017-02-09 22:37:40,976 :    raise value
2017-02-09 22:37:40,976 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/app.py", line 1612, in full_dispatch_request
2017-02-09 22:37:40,976 :    rv = self.dispatch_request()
2017-02-09 22:37:40,976 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/app.py", line 1598, in dispatch_request
2017-02-09 22:37:40,976 :    return self.view_functions[rule.endpoint](**req.view_args)
2017-02-09 22:37:40,976 :  File "./hello.py", line 78, in parse_grammar
2017-02-09 22:37:40,976 :    return render_template('parse_grammar.html', grammar=grammar, sentence=sentence, error=error)
2017-02-09 22:37:40,976 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/templating.py", line 134, in render_template
2017-02-09 22:37:40,976 :    context, ctx.app)
2017-02-09 22:37:40,977 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/flask/templating.py", line 116, in _render
2017-02-09 22:37:40,977 :    rv = template.render(context)
2017-02-09 22:37:40,977 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/jinja2/environment.py", line 1008, in render
2017-02-09 22:37:40,977 :    return self.environment.handle_exception(exc_info, True)
2017-02-09 22:37:40,977 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/jinja2/environment.py", line 780, in handle_exception
2017-02-09 22:37:40,977 :    reraise(exc_type, exc_value, tb)
2017-02-09 22:37:40,977 :  File "/home/tess/.virtualenvs/my-virtualenv/lib/python3.5/site-packages/jinja2/_compat.py", line 37, in reraise
2017-02-09 22:37:40,977 :    raise value.with_traceback(tb)
2017-02-09 22:37:40,977 :  File "/home/tess/mysite/templates/parse_grammar.html", line 11, in top-level template code
2017-02-09 22:37:40,978 :    {%- for item in grammar recursive %}
2017-02-09 22:37:40,978 :  File "/home/tess/mysite/templates/parse_grammar.html", line 13, in template
2017-02-09 22:37:40,978 :    {%- if isinstance(item[1], str) %}
2017-02-09 22:37:40,978 :jinja2.exceptions.UndefinedError: 'isinstance' is undefined