__doc__ = u"""
  >>> swallow(name = "Brian")
  This swallow is called Brian
  >>> swallow(airspeed = 42)
  This swallow is flying at 42 furlongs per fortnight
  >>> swallow(coconuts = 3)
  This swallow is carrying 3 coconuts
"""

def swallow(name = None, airspeed = None, coconuts = None):
    if name is not None:
        print u"This swallow is called", name
    if airspeed is not None:
        print u"This swallow is flying at", airspeed, u"furlongs per fortnight"
    if coconuts is not None:
        print u"This swallow is carrying", coconuts, u"coconuts"

