Hello Ruby

def reverse(value)
  if value.length > 1 then 
    value[value.length-1] + reverse(value[0,value.length-1]) 
  else 
    value[0] 
  end
end

The string formatting functions of Ruby caught my interest, but I haven't checked if any equivalents exist in Python.

irb> "#{reverse 'Hello, World!'}"
=> "!dlroW ,olleH"