Here's what a delimited code block looks like:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ {.haskell}
-- | Inefficient quicksort in haskell.
qsort :: (Enum a) => [a] -> [a]
qsort []     = []
qsort (x:xs) = qsort (filter (< x) xs) ++ [x] ++
               qsort (filter (>= x) xs) 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

And here's how it looks after syntax highlighting:

-- | Inefficient quicksort in haskell.
qsort :: (Enum a) => [a] -> [a]
qsort []     = []
qsort (x:xs) = qsort (filter (< x) xs) ++ [x] ++
               qsort (filter (>= x) xs) 

Here's some python, with numbered lines (specify {.python .numberLines}):

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class FSM(object):

"""This is a Finite State Machine (FSM).
"""

def __init__(self, initial_state, memory=None):

    """This creates the FSM. You set the initial state here. The "memory"
    attribute is any object that you want to pass along to the action
    functions. It is not used by the FSM. For parsing you would typically
    pass a list to be used as a stack. """

    # Map (input_symbol, current_state) --> (action, next_state).
    self.state_transitions = {}
    # Map (current_state) --> (action, next_state).
    self.state_transitions_any = {}
    self.default_transition = None
    ...