file rangetest _test py from __future__ import print_function from rangetest import rangetest print(__debug__false if "python - main py@rangetest(( )persinfo rangetest)(persinfodef persinfo(nameage)age must be in print('% is % years old(nameage)@rangetest([ ][ ][ ]def birthday(mdy)print('birthday { }/{ }/{ }format(mdy)class persondef __init__(selfnamejobpay)self job job self pay pay @rangetest([ ]giveraise rangetest)(giveraisedef giveraise(selfpercent)arg is the self instance here self pay int(self pay ( percent)comment lines raise typeerror unless "python -oused on shell command line persinfo('bob smith' #persinfo('bob smith' really runs oncallwith state or person if - cmd line argument birthday( #birthday( sue person('sue jones''dev' sue giveraise print(sue pay#sue giveraise( #print(sue payreally runs oncall(self or giveraise(self if - when runvalid calls in this code produce the following output (all the code in this section works the same under python and xbecause function decorators are supported in bothwe're not using attribute delegationand we use version-neutral exception construction and printing techniques) :\codepython rangetest _test py true bob smith is years old birthday uncommenting any of the invalid calls causes typeerror to be raised by the decorator here' the result when the last two lines are allowed to run (as usuali've omitted some of the error message text here to save space) :\codepython rangetest _test py true decorators