[Tutor] help with macOS version 10.12.5

[Carlton Banks]

Have you tried brew install python3
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 3 taps (caskroom/cask, homebrew/core, homebrew/science).
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berkeley-db                homebrew/science/nco       percona-server
bitrise                    hugo                       percona-server-mongodb
carthage                   jhipster                   percona-toolkit
clang-format               ldc                        percona-xtrabackup
dbxml                      mongodb                    strongswan
exploitdb                  paket                      varnish at 4
folly                      pcre ✔                     yadm

Error: python3 3.5.1 is already installed
To install 3.6.1, first run `brew unlink python3`
Error occurs on mine as i’ve already installed it..
> Den 10. jul. 2017 kl. 14.44 skrev maia fornaro via Tutor <tutor at python.org>:
> 
> Hello, My name is maia and I'm train to install python 3 in my macOS  sierra version 10.12.5 and I receive this error went i open python:
> 
> Python 3.6.1 (v3.6.1:69c0db5050, Mar 21 2017, 01:21:04) 
> [GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
> Type "copyright", "credits" or "license()" for more information.
>>>> WARNING: The version of Tcl/Tk (8.5.9) in use may be unstable.
> Visit http://www.python.org/download/mac/tcltk/ for current information.
> 
> I try to install another tcltk version but still have the same error, so I will like for your help.
> Thanks !
> Maia 
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