SolutionsChapter 8.docx
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SolutionsChapter8
Solutions-Chapter8
8-1:
Message
Writeafunctioncalled display_message（） thatprintsonesentencetellingeveryonewhatyouarelearningaboutinthischapter.Callthefunction,andmakesurethemessagedisplayscorrectly.
defdisplay_message（）:
"""DisplayamessageaboutwhatI'mlearning."""
msg="I'mlearningtostorecodeinfunctions."
print（msg）
display_message（）
Output:
I'mlearningtostorecodeinfunctions.
8-2:
FavoriteBook
Writeafunctioncalled favorite_book（） thatacceptsoneparameter, title.Thefunctionshouldprintamessage,suchas OneofmyfavoritebooksisAliceinWonderland. Callthefunction,makingsuretoincludeabooktitleasanargumentinthefunctioncall.
deffavorite_book（title）:
"""Displayamessageaboutsomeone'sfavoritebook."""
print（title+"isoneofmyfavoritebooks."）
favorite_book（'TheAbstractWild'）
Output:
TheAbstractWildisoneofmyfavoritebooks.
8-3:
T-Shirt
Writeafunctioncalled make_shirt（） thatacceptsasizeandthetextofamessagethatshouldbeprintedontheshirt.Thefunctionshouldprintasentencesummarizingthesizeoftheshirtandthemessageprintedonit.
Callthefunctiononceusingpositionalargumentstomakeashirt.Callthefunctionasecondtimeusingkeywordarguments.
defmake_shirt（size,message）:
"""Summarizetheshirtthat'sgoingtobemade."""
print（"\nI'mgoingtomakea"+size+"t-shirt."）
print（'Itwillsay,"'+message+'"'）
make_shirt（'large','IlovePython!
'）
make_shirt（message="Readabilitycounts.",size='medium'）
Output:
I'mgoingtomakealarget-shirt.
Itwillsay,"IlovePython!
"
I'mgoingtomakeamediumt-shirt.
Itwillsay,"Readabilitycounts."
8-4:
LargeShirts
Modifythe make_shirt（） functionsothatshirtsarelargebydefaultwithamessagethatreads IlovePython.Makealargeshirtandamediumshirtwiththedefaultmessage,andashirtofanysizewithadifferentmessage.
defmake_shirt（size='large',message='IlovePython!
'）:
"""Summarizetheshirtthat'sgoingtobemade."""
print（"\nI'mgoingtomakea"+size+"t-shirt."）
print（'Itwillsay,"'+message+'"'）
make_shirt（）
make_shirt（size='medium'）
make_shirt（'small','Programmersareloopy.'）
Output:
I'mgoingtomakealarget-shirt.
Itwillsay,"IlovePython!
"
I'mgoingtomakeamediumt-shirt.
Itwillsay,"IlovePython!
"
I'mgoingtomakeasmallt-shirt.
Itwillsay,"Programmersareloopy."
8-5:
Cities
Writeafunctioncalled describe_city（） thatacceptsthenameofacityanditscountry.Thefunctionshouldprintasimplesentence,suchas ReykjavikisinIceland. Givetheparameterforthecountryadefaultvalue.Callyourfunctionforthreedifferentcities,atleastoneofwhichisnotinthedefaultcountry.
defdescribe_city（city,country='chile'）:
"""Describeacity."""
msg=city.title（）+"isin"+country.title（）+"."
print（msg）
describe_city（'santiago'）
describe_city（'reykjavik','iceland'）
describe_city（'puntaarenas'）
Output:
SantiagoisinChile.
ReykjavikisinIceland.
PuntaArenasisinChile.
8-6:
CityNames
Writeafunctioncalled city_country（） thattakesinthenameofacityanditscountry.Thefunctionshouldreturnastringformattedlikethis:
“Santiago,Chile”
Callyourfunctionwithatleastthreecity-countrypairs,andprintthevaluethat’sreturned.
defcity_country（city,country）:
"""Returnastringlike'Santiago,Chile'."""
return（city.title（）+","+country.title（））
city=city_country（'santiago','chile'）
print（city）
city=city_country（'ushuaia','argentina'）
print（city）
city=city_country（'longyearbyen','svalbard'）
print（city）
Output:
Santiago,Chile
Ushuaia,Argentina
Longyearbyen,Svalbard
8-7:
Album
Writeafunctioncalled make_album（） thatbuildsadictionarydescribingamusicalbum.Thefunctionshouldtakeinanartistnameandanalbumtitle,anditshouldreturnadictionarycontainingthesetwopiecesofinformation.Usethefunctiontomakethreedictionariesrepresentingdifferentalbums.Printeachreturnvaluetoshowthatthedictionariesarestoringthealbuminformationcorrectly.
Addanoptionalparameterto make_album（） thatallowsyoutostorethenubmeroftracksonanalbum.Ifthecallinglineincludesavalueforthenumberoftracks,addthatvaluetothealbum’sdictionary.Makeatleastonenewfunctioncallthatincludesthenubmeroftracksonanalbum.
Simpleversion:
defmake_album（artist,title）:
"""Buildadictionarycontaininginformationaboutanalbum."""
album_dict={
'artist':
artist.title（）,
'title':
title.title（）,
}
returnalbum_dict
album=make_album（'metallica','ridethelightning'）
print（album）
album=make_album（'beethoven','ninthsymphony'）
print（album）
album=make_album（'willienelson','red-headedstranger'）
print（album）
Output:
{'title':
'RideTheLightning','artist':
'Metallica'}
{'title':
'NinthSymphony','artist':
'Beethoven'}
{'title':
'Red-HeadedStranger','artist':
'WillieNelson'}
Withtracks:
defmake_album（artist,title,tracks=0）:
"""Buildadictionarycontaininginformationaboutanalbum."""
album_dict={
'artist':
artist.title（）,
'title':
title.title（）,
}
iftracks:
album_dict['tracks']=tracks
returnalbum_dict
album=make_album（'metallica','ridethelightning'）
print（album）
album=make_album（'beethoven','ninthsymphony'）
print（album）
album=make_album（'willienelson','red-headedstranger'）
print（album）
album=make_album（'ironmaiden','pieceofmind',tracks=8）
print（album）
Output:
{'artist':
'Metallica','title':
'RideTheLightning'}
{'artist':
'Beethoven','title':
'NinthSymphony'}
{'artist':
'WillieNelson','title':
'Red-HeadedStranger'}
{'tracks':
8,'artist':
'IronMaiden','title':
'PieceOfMind'}
8-8:
UserAlbums
StartwithyourprogramfromExercise8-7.Writea while loopthatallowsuserstoenteranalbum’sartistandtitle.Onceyouhavethatinformation,call make_album（） withtheuser’sinputandprintthedictionarythat’screated.Besuretoincludeaquitvalueinthe while loop.
defmake_album（artist,title,tracks=0）:
"""Buildadictionarycontaininginformationaboutanalbum."""
album_dict={
'artist':
artist.title（）,
'title':
title.title（）,
}
iftracks:
album_dict['tracks']=tracks
returnalbum_dict
#Preparetheprompts.
title_prompt="\nWhatalbumareyouthinkingof?
"
artist_prompt="Who'stheartist?
"
#Lettheuserknowhowtoquit.
print（"Enter'quit'atanytimetostop."）
whileTrue:
title=input（title_prompt）
iftitle=='quit':
break
artist=input（artist_prompt）
ifartist=='quit':
break
album=make_album（artist,title）
print（album）
print（"\nThanksforresponding!
"）
Output:
Enter'quit'atanytimetostop.
Whatalbumareyouthinkingof?
numberofthebeast
Who'stheartist?
ironmaiden
{'artist':
'IronMaiden','title':
'NumberOfTheBeast'}
Whatalbumareyouthinkingof?
touchofclass
Who'stheartist?
angelromero
{'artist':
'AngelRomero','title':
'TouchOfClass'}
Whatalbumareyouthinkingof?
rustinpeace
Who'stheartist?
megadeth
{'artist':
'Megadeth','title':
'RustInPeace'}
Whatalbumareyouthinkingof?
quit
Thanksforresponding!
8-9:
Magicians
Makealistofmagician’snames.Passthelisttoafunctioncalled show_magicians（）,wichprintsthenameofeachmagicianinthelist.
defshow_magicians（magicians）:
"""Printthenameofeachmagicianinthelist."""
formagicianinmagicians:
print（magician.title（））
magicians=['harryhoudini','davidblaine','teller']
show_magicians（magicians）
Output:
HarryHoudini
DavidBlaine
Teller
8-10:
GreatMagicians
StartwithacopyofyourprogramfromExercise8-9.Writeafunctioncalled make_great（） thatmodifiesthelistofmagiciansbyaddingthephrase theGreat toeachmagician’sname.Callshow_magicians（） toseethatthelisthasactuallybeenmodified.
defshow_magicians（magicians）:
"""Printthenameofeachmagicianinthelist."""
formagicianinmagicians:
print（magician）
defmake_great（magicians）:
"""Add'theGreat!
'toeachmagician'sname."""
#Buildanewlisttoholdthegreatmusicians.
great_magicians=[]
#Makeeachmagiciangreat,andaddittogreat_magicians.
whilemagicians:
magician=magicians.pop（）
great_magician=magician+'theGreat'
great_magicians.append（great_magician）
#Addthegreatmagiciansbackintomagicians.
forgreat_magicianingreat_magicians:
magicians.append（great_magician）
magicians=['HarryHoudini','DavidBlaine','Teller']
show_magicians（magicians）
print（"\n"）
make_great（magicians）
show_magicians（magicians）
Output:
HarryHoudini
DavidBlaine
Teller
TellertheGreat
DavidBlainetheGreat
HarryHoudinitheGreat
8-11:
UnchangedMagicians
StartwithyourworkfromExercise8-10.Callthefunction make_great（） withacopyofthelistofmagicians’names.Becausetheoriginallistwillbeunchanged,returnthenewlistandstoreitinaseparatelist.Call show_magicians（） witheachlisttoshowthatyouhaveonelistoftheoriginalnamesandonelistwith theGreat addedtoeachmagician’sname.
defshow_magicians（magicians）:
"""Printthenameofeachmagicianinthelist."""
formagicianinmagicians:
print（magician）
defmake_great（magicians）:
"""Add'theGreat!
'toeachmagician'sname."""
#Buildanewlisttoholdthegreatmusicians.
great_magicians=[]
#Makeeachmagiciangreat,andaddittogreat_magicians.
whilemagicians:
magician=magicians.pop（）
great_magician=magician+'theGreat'
great_magicians.append（great_magician）
#Addthegreatmagiciansbackintomagicians.
forgreat_magicianingreat_magicians:
magicians.append（great_magician）
returnmagicians
magicians=['HarryHoudini'
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