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Getting started#


Install the package using pip.

pip install tcom


The first thing you must do in your app is to create a “catalog” of components. This is the object that manage the components and its global settings. Then, you add to the catalog the folder(s) with your components.

from tcom import Catalog

catalog = Catalog()

You use the catalog to render a parent component from your views:

def myview():
  return catalog.render(
    title="Lorem ipsum",


The components are .jinja files. The name of the file before the first dot is the component name and it must begin with an uppercase letter. This is the only way to distinguish themn from regular HTML tags.

For example, if the filename es PersonForm.jinja, the name of the component is PersonForm and can be used like <PersonForm>...</PersonForm>.

A component can begin with a Jinja comment where it declare what arguments it takes. Some of these arguments might have a default value (making them optional):

{#def title, message='Hi' #}

<h1>{{ title }}</h1>
<div>{{ message }}. This is my component</div>


Template Components use Jinja internally to render the templates. You can add your own global variables and functions, filters, tests, and Jinja extensions when creating the catalog:

from tcom import Catalog

catalog = Catalog(
    globals={ ... },
    filters={ ... },
    tests={ ... },
    extensions=[ ... ],

or afterwards.

catalog.jinja_env.globals.update({ ... })
catalog.jinja_env.filters.update({ ... })
catalog.jinja_env.tests.update({ ... })
catalog.jinja_env.extensions.extend([ ... ])

If you use Flask, for example, you should pass the values of its own Jinja environment:

app = Flask(__name__)

catalog = tcom.Catalog(

The “do” extension is enabled by default, so you can write things like:

{% do attrs.add_class("btn") %}
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