rowboat.py

#!/usr/bin/env python

class NotGentleError(Exception):
    pass

def row(boat):
    raise NotGentleError('gently!')

def but(dream):
    return None

def merrily():
    print ':)'

if __name__ == '__main__':
    life = None
    boat = None
    dream = None

    try:
        row(row(row(boat)))
    except NotGentleError:
        merrily()
        merrily()
        merrily()
        merrily()

    print life is but(dream)