baseimage-tutorial-framework/tfw/config/lazy_environment.py

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from collections import namedtuple
from os import environ
from tfw.internals.lazy import lazy_property
class LazyEnvironment:
def __init__(self, prefix, tuple_name):
self._prefix = prefix
self._tuple_name = tuple_name
@lazy_property
def environment(self):
return self.prefixed_envvars_to_namedtuple()
def prefixed_envvars_to_namedtuple(self):
envvars = {
envvar.replace(self._prefix, '', 1): environ.get(envvar)
for envvar in environ.keys()
if envvar.startswith(self._prefix)
}
return namedtuple(self._tuple_name, envvars)(**envvars)