🌍 Environment

• Your operating system and version: MacOS X 10.12
• Your python version: 3.6.5
• How did you install python (e.g. apt or pyenv)? Did you use a virtualenv?: brew, no virtualenv
• Your rust version: rustc 1.28.0-nightly (5bf68db6e 2018-05-28)

💥 Reproducing

I somehow can't exceptions to work in my project.

To reproduce the issue, I simple hacked an exception to the word-count example code.
Here's the diff of my changes: master...mre:master

Here is a simple test case to reproduce my issue.

cd /tmp
git clone [email protected]:mre/pyo3.git
cd pyo3/examples/word-count
python3 setup.py install
cd ~
python3 -c "from word_count import search"

I expected a JSONDecodeError, but got this:

python3 -c "from word_count import search"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/lib/python3.6/site-packages/word_count-0.1.0-py3.6-macosx-10.12-x86_64.egg/word_count/__init__.py", line 4, in <module>
    from ._word_count import search, search_sequential, JSONDecodeError
ImportError: cannot import name 'JSONDecodeError'

Any help would be highly appreciated.