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One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!

	# The new git-scm.com site includes man pages designed for pleasant viewing in a web browser:
	#
	# http://git-scm.com/docs
	#
	# The commands below can be used to configure git to open these pages when
	# using `git help -w <command>' from the command line. Just enter the config
	# commands in your shell to modify your ~/.gitconfig file.

	# Create a new browser command and configure help -w to use it.
	git config --global browser.gitscm.cmd "/bin/sh -c 'open http://git-scm.com/docs/\$(basename \$1 .html)' --"

	# coding: utf-8
	#
	# Encode any codepoint outside the ASCII printable range to an HTML character
	# reference (http://bit.ly/KNupLT).
	def encode(string)
	string.each_codepoint.inject("") do \|buffer, cp\|
	cp = "&#x#{cp.to_s(16)};" unless cp >= 0x20 && cp <= 0x7E
	buffer << cp
	end
	end

	desc "A user's comment" do
	let(:user) { User.create! name: "John" }
	let(:comment) { user.comments.create! }

	it "delegates to user's name" do
	comment.name.should eq(user.name)
	end
	end

	def Maybe(obj)
	return Maybe.new(Nothing.new) if obj.nil?
	return Maybe.new(obj)
	end

	class Nothing
	def method_missing(*args, &block)
	self
	end