`str(r.now())` or `repr(r.now())` raise RuntimeError in python 3.7+ about rethinkdb-python HOT 8 CLOSED

(rethinkdb-python-ve3)$ pip install -e .
Obtaining file:///Users/nlevitt/workspace/rethinkdb-python
    ERROR: Complete output from command python setup.py egg_info:
    ERROR: Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/Users/nlevitt/workspace/rethinkdb-python/setup.py", line 30, in <module>
        from rethinkdb.version import VERSION
      File "/Users/nlevitt/workspace/rethinkdb-python/rethinkdb/__init__.py", line 88, in <module>
        r = RethinkDB()
      File "/Users/nlevitt/workspace/rethinkdb-python/rethinkdb/__init__.py", line 36, in __init__
        from rethinkdb import (
      File "/Users/nlevitt/workspace/rethinkdb-python/rethinkdb/_dump.py", line 35, in <module>
        from rethinkdb import _export, utils_common
      File "/Users/nlevitt/workspace/rethinkdb-python/rethinkdb/_export.py", line 38, in <module>
        import six
    ModuleNotFoundError: No module named 'six'
    ----------------------------------------
ERROR: Command "python setup.py egg_info" failed with error code 1 in /Users/nlevitt/workspace/rethinkdb-python/

    ImportError: cannot import name 'ql2_pb2' from 'rethinkdb' (/Users/nlevitt/workspace/rethinkdb-python/rethinkdb/__init__.py)