👋 Hi! @max @schrockn I submitted a patch this morning and a new release

v0.2.8.post1

and I'm baffled how what I changed broke this:

(venv) 001: [develop x?] $ pip list | grep dag
dagit               0.2.8.post0 
dagster             0.2.8.post1 
(venv) 001: [develop x?] $ python
Python 3.6.6 |Anaconda, Inc.| (default, Jun 28 2018, 11:07:29) 
[GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import dagster
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "repos/project/venv/lib/python3.6/site-packages/dagster/__init__.py", line 1, in <module>
    from dagster.core.execution import (
  File "repos/project/venv/lib/python3.6/site-packages/dagster/core/execution.py", line 28, in <module>
    from .definitions import (
  File "repos/project/venv/lib/python3.6/site-packages/dagster/core/definitions/__init__.py", line 1, in <module>
    from .context import PipelineContextDefinition
  File "repos/project/venv/lib/python3.6/site-packages/dagster/core/definitions/context.py", line 5, in <module>
    from dagster.core.types import Field, Dict, String
  File "repos/project/venv/lib/python3.6/site-packages/dagster/core/types/__init__.py", line 2, in <module>
    from .config_schema import (
  File "repos/project/venv/lib/python3.6/site-packages/dagster/core/types/config_schema.py", line 2, in <module>
    from dagster.utils import single_item
ImportError: cannot import name 'single_item'
>>>

I cannot replicate this on the new

0.2.8.post1

branch.