ERROR: Package 'web3' requires a different Python: 2.7.15 not in '>=3.5.3,<4'

I am using the following link to install Oyente tool

I have got Python 3.6.9 installed on my Ubuntu 18.04/. When I am running the command pip2, I am getting error messages:

    zulfi@lc2530hz:~$ python3 --version
Python 3.6.9
zulfi@lc2530hz:~$ source envsp/bin/activate
(envsp) zulfi@lc2530hz:~$ pip2 install oyente
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 oyente
  Using cached https://files.pythonhosted.org/packages/13/3c/52b8dee604cbdf35c1d65a141b779d9c14c8d313251c697b40a93f58d3d5/oyente-0.2.7-py2-none-any.whl
Collecting web3
  Using cached https://files.pythonhosted.org/packages/85/01/eacb73ae16364295bf26cba4aacc94e513f5feae54dbb5f8121bec697e49/web3-4.8.1.tar.gz
ERROR: Package 'web3' requires a different Python: 2.7.15 not in '>=3.5.3,<4'
(envsp) zulfi@lc2530hz:~$ 

Somebody please guide me how to solve this error.

Zulfi.