decorator_example.py

# Decorate manually with this.
def fixparams(decorated, **fixed):
  def _fixparams(*args, **kwargs):
    kwargs.update(fixed)
    return decorated(*args, **kwargs)
  return _fixparams

# old school / inline syntax
def myfunc(a, b, c):
  print '%s %s %s' % (a, b, c)

fixbc = fixparams(myfunc, b='fixedbee', c='fixedsea')
fixbc('hey!')
fixbc('hey again', b='originalb')

print '\n-----------------------------------\n'

# one decoration level more is needed if you want to parameterize the
# decorator.
def fixparams2(**fixed):
  def _fixparams2(decorated, *args, **kwargs):
    return fixparams(decorated, **fixed)
  return _fixparams2


# decorator syntax
@fixparams2(b='newbee', c='seethis')
def fixbcagain(a, b, c):
  print '%s %s %s (again)' % (a, b, c)

# and call it
fixbcagain('ohohoh')