Colossal

Larger than life (colossal) macros for python!

Installation

pip install colossal

You can either register the macros globally, by running:

python -m colossal.register_global

or you can register them on demand by running the following before importing a module containing macros.

import colossal
colossal.register()

Usage

Jinja Templates

For jinja templating add # -*- coding: jinja2 -*- to the top of your module.

Note: The block start string is set to "# {%" in order to conform as much as possible to standard python code.

Example

# -*- coding: jinja2 -*-

# {% set attrs = ['a', 'b', 'c'] %}

class MyClass:
    def __init__(
        self,
        # {% for attr in attrs %}
        {{attr}},
        # {% endfor %}
    ):
        # {% for attr in attrs %}
        self.{{attr}} = {{attr}}
        # {% endfor %}

This code is transformed, once imported, into:

class MyClass:
    def __init__(
        self,
        a,
        b,
        c,
    ):
        self.a = a
        self.b = b
        self.c = c

You can also use jinja templating to render certain parts of code in development/debugging only, e.g:

# -*- coding: jinja2 -*-
# {% if DEBUG %}
import pdb; pdb.set_trace()
# {% endif %}

The above code will be rendered only when the env variable DEBUG is set, in which case it will be rendered as:

import pdb; pdb.set_trace()

Macros

For macros add # -*- coding: macro -*- to the top of your module.

Defined macros:

• dict@(x, y, z) which expands to dict(x=x, y=y, z=z)

Caveats

• You will need to register colossal before importing any module containing macros/templates.
• In order to force rerendering of templates you will neeed to delete the appropriate .pyc file in the __pycache__ folder.