Can't install v2.5.8 of Python SDK

[root@ip-10-0-126-30 ~]# sudo pip install couchbase

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. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support

Collecting couchbase

  Using cached https://files.pythonhosted.org/packages/9a/c6/da995cf19160a295730f5b975ff1c65cb9abae794e4dbc245086fb417b24/couchbase-2.5.8.tar.gz

    ERROR: Command errored out with exit status 1:

     command: /usr/bin/python2 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-k8b5DR/couchbase/setup.py'"'"'; __file__='"'"'/tmp/pip-install-k8b5DR/couchbase/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-k8b5DR/couchbase/

    Complete output (17 lines):

    Traceback (most recent call last):

      File "<string>", line 1, in <module>

      File "/tmp/pip-install-k8b5DR/couchbase/setup.py", line 240, in <module>

        **setup_kw

      File "/usr/lib64/python2.7/distutils/core.py", line 112, in setup

        _setup_distribution = dist = klass(attrs)

      File "/usr/lib/python2.7/site-packages/setuptools/dist.py", line 265, in __init__

        self.fetch_build_eggs(attrs.pop('setup_requires'))

      File "/usr/lib/python2.7/site-packages/setuptools/dist.py", line 289, in fetch_build_eggs

        parse_requirements(requires), installer=self.fetch_build_egg

      File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 601, in resolve

        requirements = list(requirements)[::-1]  # set up the stack

      File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2839, in parse_requirements

        line, p, specs = scan_list(VERSION,LINE_END,line,p,(1,2),"version spec")

      File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2807, in scan_list

        raise ValueError("Expected "+item_name+" in",line,"at",line[p:])

    ValueError: ('Expected version spec in', "typing; python_version<'3.7'", 'at', "; python_version<'3.7'")

    ----------------------------------------

ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

[root@ip-10-0-126-30 ~]# sudo pip install couchbase==2.5.7

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. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support

Collecting couchbase==2.5.7

  Using cached https://files.pythonhosted.org/packages/38/da/629b10203f1a9b9b42bdd4554e0d436552a5ec77100499a7693df6044aa0/couchbase-2.5.7.tar.gz

Requirement already satisfied: typing in /usr/lib/python2.7/site-packages (from couchbase==2.5.7) (3.7.4.1)

Installing collected packages: couchbase

  Running setup.py install for couchbase ... done

Successfully installed couchbase-2.5.7