Homebrew/homebrew — pull request #28201 by samueljohn (2014-04-06 15:18:23+00:00)
Title: python caveats: use `>` instead of `>>`

The `homebrew.pth` should be a file with a single line in it.
Also (at least on zsh) if the file does not exist, `>>` will
result in an error. The `>` works in both, bash and zsh and
creates the file with the `echo`ed content.