def PrintModelParamHelp():
params = MakeParams()
traits = params.traits()
# Display traits in alphabetical order.
keys = sorted(n for n in params.trait_names() if not n.startswith('trait_'))
# Format set of traits as a string.
data = list()
for k in keys:
trait = traits[k]
desc = trait.desc or ''
if desc:
idx = desc.index(' ')
desc = desc[:idx].capitalize() + desc[idx:]
desc = "%s. " % desc
doc = (desc + "Must be %s. " % trait.full_info(params, '', '') +
"Default is: %s" % pprint.pformat(trait.default))
data.append(("%s:" % k, doc))
PrintDict(data, max_key_len=25)
