I am used to develop web applications on Django and gunicorn.

In case of Django, any application modules in a Django application can get deployment settings through django.conf.settings. The "settings.py" is written in Python, so that any arbitrary settings and pre-processing can be defined dynamically.

In case of gunicorn, it has three configuration places in order of precedence, and one settings registry class instance combines those.(But usually these settings are used only for gunicorn not application.)

  1. Command line parameters.
  2. Configuration file. (like Django, written in Python which can have any arbitrary settings dynamically.)
  3. Paster application settings.

In case of Pyramid, according to Pyramid documentation, deployment settings may be usually put into pyramid.registry.Registry().settings. But it seems to be accessed only when a pyramid.router.Router() instances exists. That is pyramid.threadlocal.get_current_registry().settings returns None, during the startup process in an application "main.py".

For example, I usually define some business logic in SQLAlchemy model modules, which requires deployment settings as follows.

myapp/models.py

from sqlalchemy import Table, Column, Types
from sqlalchemy.orm import mapper
from pyramid.threadlocal import get_current_registry
from myapp.db import session, metadata

settings = get_current_registry().settings

mytable = Table('mytable', metadata,
    Column('id', Types.INTEGER, primary_key=True,)
    (other columns)...
)

class MyModel(object):
    query = session.query_property()
    external_api_endpoint = settings['external_api_uri']
    timezone = settings['timezone']

    def get_api_result(self):
        (interact with external api ...)

mapper(MyModel, mytable)

But, "settings['external_api_endpoint']" raises a TypeError excepti

python paste pyramid
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