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    python

    Posted April 14, 2024  ‐  2 min read

    pipenv

    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

    logging

    formatter :

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

    (Reference: Pyramid Logging tutorial)

    jinja2

    • 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 %}
</ul>
    • 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) }}

    Source

    Resources