I'm building python 3.6.4 from source and stashing it in $HOME. No errors so far.

EDIT: Worked great!

    @cloudshell:~/python3/bin$ ./ipython3
    Python 3.6.4 (default, Jan 28 2018, 00:39:17)
    Type 'copyright', 'credits' or 'license' for more information
    IPython 6.2.1 -- An enhanced Interactive Python. Type '?' for help.
    In [1]: from __future__ import braces
      File "<ipython-input-1-6d5c5b2f0daf>", line 1
        from __future__ import braces
                                     ^
    SyntaxError: not a chance