Error installing Python 3 with Homebrew

Question

I'm having trouble when I want to install Python 3 using Homebrew.

This is my console:

$ brew install python3
Warning: You are using OS X 10.12.
We do not provide support for this pre-release version.
You may encounter build failures or other breakages.
Please create pull-requests instead of filing issues.
==> Installing dependencies for python3: readline, sqlite, gdbm, makedepend, openssl
==> Installing python3 dependency: readline
==> Downloading https://ftpmirror.gnu.org/readline/readline-6.3.tar.gz
Already downloaded: /Users/slorenzo/Library/Caches/Homebrew/readline-6.3.8.tar.gz
==> Downloading https://gist.githubusercontent.com/jacknagel/d886531fb6623b60b2af/raw/746fc543e56bc37

curl: (22) The requested URL returned error: 404 Not Found
Error: Failed to download resource "readline--patch"
Download failed: https://gist.githubusercontent.com/jacknagel/d886531fb6623b60b2af/raw/746fc543e56bc37a26ccf05d2946a45176b0894e/readline-6.3.8.diff

Does anyone know how I can solve this problem?

Thanks.

Answer 1

Try running:

If Homebrew was updated on Aug 10-11th 2016 and brew update always says Already up-to-date you need to run:

cd "$(brew --repo)" && git fetch && git reset --hard origin/master && brew update

Answer 2

You are using an old version of Homebrew. The patch file that's failing to download was removed from the recipe in September 2016, and the warning about macOS 10.12 being a "pre-release version" is clearly no longer correct.

Run brew update and try again.