Install via pip does not work

[Jon-AtAWS]

Mac OS, brew installed python3.

$ virtualenv tmp
$ cd tmp
$ source bin/activate
(tmp) $ pip3 install lunaticlog
Collecting lunaticlog
Installing collected packages: lunaticlog
Successfully installed lunaticlog-0.1.2

(tmp) $ python
Python 3.7.2 (v3.7.2:9a3ffc0492, Dec 24 2018, 02:44:43)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

import lunaticlog
Traceback (most recent call last):
File "", line 1, in
ModuleNotFoundError: No module named 'lunaticlog'

(tmp) $ pip3 list
Package Version

---

lunaticlog 0.1.2
pip 19.1.1
setuptools 41.0.1
wheel 0.33.4

The distinfo is there, but not the code.
$ ls lib/python3.7/site-packages/
pycache pip-19.1.1.dist-info src
easy_install.py pkg_resources tests
lunaticlog-0.1.2.dist-info setuptools wheel
pip setuptools-41.0.1.dist-info wheel-0.33.4.dist-info

If I clone the repo into the site-packages directory, then it works. (I have to manually add numpy)
(tmp) $ pip3 install numpy
(tmp) $ cd lib/python3.7/site-packages/
(tmp) $ git clone https://github.com/xuwenyihust/lunaticlog.git
Cloning into 'lunaticlog'...
remote: Enumerating objects: 919, done.
remote: Total 919 (delta 0), reused 0 (delta 0), pack-reused 919
Receiving objects: 100% (919/919), 5.36 MiB | 3.00 MiB/s, done.
Resolving deltas: 100% (439/439), done.
(tmp) $ python
Python 3.7.2 (v3.7.2:9a3ffc0492, Dec 24 2018, 02:44:43)
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import lunaticlog
>>>