Can not install obo, requirement gevent ==0.13.6

[akumacxd]

Env: SELS15SP1, python3-gevent-1.4.0-5.46.x86_64.rpm

cat requirements.txt
PyYAML
nose >=1.0.0
boto >=2.6.0
bunch >=1.0.0
gevent ==0.13.6 <=== SLES15SP1 can not install gevent 0.13.6
isodate >=0.4.4
pytz >=2011k
ordereddict
argparse
jsonpickle
xmljson

pip install obo
Requirement already satisfied: obo in /usr/lib/python3.6/site-packages/obo-0.0.1-py3.6.egg (0.0.1)
Requirement already satisfied: boto>=2.6.0 in /usr/lib/python3.6/site-packages (from obo) (2.49.0)
Requirement already satisfied: PyYAML in /usr/lib64/python3.6/site-packages (from obo) (3.13)
Collecting bunch>=1.0.0 (from obo)
Using cached https://files.pythonhosted.org/packages/ef/bf/a4cf1779a4ffb4f610903fa08e15d1f4a8a2f4e3353a02afbe097c5bf4a8/bunch-1.0.1.tar.gz
Collecting gevent==0.13.6 (from obo)
Using cached https://files.pythonhosted.org/packages/14/83/37f998c61406cb765264db8b68a24296e1f40d05a57b18dbfafa0883b5bd/gevent-0.13.6.tar.gz
ERROR: Command errored out with exit status 1:
command: /usr/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-i54me9hx/gevent/setup.py'"'"'; file='"'"'/tmp/pip-install-i54me9hx/gevent/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(file);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' egg_info --egg-base pip-egg-info
cwd: /tmp/pip-install-i54me9hx/gevent/
Complete output (6 lines):
Traceback (most recent call last):
File "", line 1, in
File "/tmp/pip-install-i54me9hx/gevent/setup.py", line 95
print 'Linking %s to %s' % (path_to_build_core_so, path_to_core_so)
^
SyntaxError: invalid syntax
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.