Handle timeouts

As of end-Nov 2018, creating a lock file takes really long time, and this
leads to TIMEOUT error (and lock file is NOT created)

There are two ways to handle this.

  1. pipenv install --skip-lock This will, as the parameter suggests, will
    not create the lock file, thus avoiding delaying the issue.
  2. Now you can create the Pipfile.lock via pipenv lock, but that would run
    into the same issue. So setup PIPENV_TIMEOUT environment variable before
    running the pipenv lock command. The value is in seconds. So for 3 minutes,
    set it to 180 (default is 120). Guessing how much to set it to is tricky. So
    if you are unsure, set it to some really high value like 10000


formatter :

%(asctime)s %(levelname)-5.5s [%(name)s:%(lineno)s][%(threadName)s] %(message)s

(Reference: Pyramid Logging tutorial)


  • Use {% %} for Statements i.e. anything that is an instruction for jinja2
    • e.g. if, from .. import .., block, macro
  • Use {{ }} for Expressions i.e. Anything that renders the HTML output
  • Add - before and/or after % to remove the white space.
  • Recursive for loop : Use keyword recursive with the for statement.
<ul class="sitemap">
{%- for item in sitemap recursive %}
    <li><a href="{{ item.href|e }}">{{ item.title }}</a>
    {%- if item.children -%}
        <ul class="submenu">{{ loop(item.children) }}</ul>
    {%- endif %}</li>
{%- endfor %}
  • If a macro name starts with an underscore, it’s not exported and can’t be imported.

Call python function from jinja

In order to make a python function available to jinja, you need to pass it to jinja while loading the Environment like :

    def sum(a, b):
        return a+b

    env = Environment(loader=FileSystemLoader(path))
    env.globals['sum] = sum

Then in jinja call it like {{ sum(3, 5) }}