md@md ~/.MINT17/code/python/test $ virtualenv venv
New python executable in venv/bin/python
Installing setuptools, pip...done.
md@md ~/.MINT17/code/python/test $
md@md ~/.MINT17/code/python/test/venv/bin $ source activate
(venv)md@md ~/.MINT17/code/python/test/venv/bin $ python -V
Python 3.7.0
(venv)md@md ~/.MINT17/code/python/test/venv/bin $ python3 -V
Python 3.4.3
(venv)md@md ~/.MINT17/code/python/test/venv/bin $ pip install aiohttp
Downloading/unpacking aiohttp
  Downloading aiohttp-3.6.2.tar.gz (1.1MB): 1.1MB downloaded
  Running setup.py (path:/home/md/.MINT17/code/python/test/venv/build/aiohttp/setup.py) egg_info for package aiohttp
    Traceback (most recent call last):
      File "<string>", line 17, in <module>
      File "/home/md/.MINT17/code/python/test/venv/build/aiohttp/setup.py", line 23
        print("Install submodules when building from git clone", file=sys.stderr)
                                                                     ^
    SyntaxError: invalid syntax
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):

  File "<string>", line 17, in <module>

  File "/home/md/.MINT17/code/python/test/venv/build/aiohttp/setup.py", line 23

    print("Install submodules when building from git clone", file=sys.stderr)

                                                                 ^

SyntaxError: invalid syntax

----------------------------------------
Cleaning up...
Command python setup.py egg_info failed with error code 1 in /home/md/.MINT17/code/python/test/venv/build/aiohttp
Storing debug log for failure in /home/md/.pip/pip.log