Eventlet - ImportError: No module named dnskeybase

I can't import eventlet on my production system. It's saying no module named dnskeybase.

# python scraper.py 
Traceback (most recent call last):
  File "scraper.py", line 7, in <module>
    import eventlet
  File "/usr/lib/python2.7/site-packages/eventlet/__init__.py", line 10, in <module>
    from eventlet import convenience
  File "/usr/lib/python2.7/site-packages/eventlet/convenience.py", line 7, in <module>
    from eventlet.green import socket
  File "/usr/lib/python2.7/site-packages/eventlet/green/socket.py", line 21, in <module>
    from eventlet.support import greendns
  File "/usr/lib/python2.7/site-packages/eventlet/support/greendns.py", line 67, in <module>
    setattr(dns.rdtypes, pkg, import_patched('dns.rdtypes.' + pkg))
  File "/usr/lib/python2.7/site-packages/eventlet/support/greendns.py", line 59, in import_patched
    return patcher.import_patched(module_name, **modules)
  File "/usr/lib/python2.7/site-packages/eventlet/patcher.py", line 120, in import_patched
    *additional_modules + tuple(kw_additional_modules.items()))
  File "/usr/lib/python2.7/site-packages/eventlet/patcher.py", line 94, in inject
    module = __import__(module_name, {}, {}, module_name.split('.')[:-1])
ImportError: No module named dnskeybase

So I tried to install it...

# pip install dnskeybase
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.
Collecting dnskeybase
  Could not find a version that satisfies the requirement dnskeybase (from versions: )
No matching distribution found for dnskeybase

and:

# pip install dnspython
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.
Requirement already satisfied: dnspython in /usr/lib/python2.7/site-packages (1.16.0)

and the eventlet version/installation:

# pip install eventlet
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7.
Collecting eventlet
  Using cached https://files.pythonhosted.org/packages/86/7e/96e1412f96eeb2f2eca9342dcc4d5bc9305880a448b603b0a8e54439b71c/eventlet-0.24.1-py2.py3-none-any.whl
Requirement already satisfied: monotonic>=1.4 in /usr/lib/python2.7/site-packages (from eventlet) (1.5)
Requirement already satisfied: six>=1.10.0 in /usr/lib/python2.7/site-packages (from eventlet) (1.12.0)
Requirement already satisfied: dnspython>=1.15.0 in /usr/lib/python2.7/site-packages (from eventlet) (1.16.0)
Requirement already satisfied: greenlet>=0.3 in /usr/lib64/python2.7/site-packages (from eventlet) (0.4.15)
Requirement already satisfied: enum34; python_version < "3.4" in /usr/lib/python2.7/site-packages (from eventlet) (1.1.6)
Installing collected packages: eventlet
Successfully installed eventlet-0.24.1

Any idea?

from Eventlet - ImportError: No module named dnskeybase