Hi,

It appears that the default.yml is overriding the custom-environment-variables.yml defined configuration.

Python Version: 2.7.8

Project Structure

• ./requirements.txt
• ./.python-version
• ./config/custom-environment-variables.yml
• ./config/default.yml
• ./main.py
• ./env

main.py

from config2.config import config

import os

print(os.environ['APP']) 
print('port', config.port) 

config/default.yml

port: 3000

config/custom-environment-variables.yml

port: APP

When run with python main.py config returns the default (3000) as expected
When run with APP=1111 python main.py config still returns 3000 where I expected 1111 however the APP environment variable is returning 1111.

Is virtualenv causing a problem here?

requirements.txt

attributedict==0.1.8
blessings==1.7
Click==7.0
colour-runner==0.1.1
config2==0.1.4
deepdiff==3.3.0
deepmerge==0.0.4
easypackage==0.1.8
filelock==3.0.9
itsdangerous==0.24
Jinja2==2.10
jsonpickle==1.0
MarkupSafe==1.0
pluggy==0.7.1
py==1.6.0
Pygments==2.2.0
PyYAML==3.13
six==1.11.0
toml==0.10.0
tox==3.5.2
virtualenv==16.0.0
Werkzeug==0.14.1

Thanks for your work btw

EDIT:
Just to add to this, defining configuration in another file works fine.
i.e config/foo.yml
and executing ENV=foo python main.py will return the correct configuration.