Edexcel GCSE in Computer Science lesson activities for Edexcel GCSE 計(jì)算機(jī)科學(xué)課程活動(dòng)

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LESSONACTIVITIESFOR

Introduction,Block1:ProblemSolving&ProgrammingandBlock2:Datarepresentation

Lesson1activities

Activity1.1

Writeaprogramtoprintout“HelloWorld”.

Activity1.2

Writeaprogramthatwritesyournameonthescreen.

Activity1.3

Copyandrunthisprogram.

print("hello"*10)

Writeaprogramthatprintsyournamesixtimes.

Lesson2activities

Activity2.1

Arethefollowingstatementstrueorfalse?

Pythonwasreleasedin2010

Trueorfalse?

PythonwasnamedaftertheTVseries“MontyPython’sFlyingCircus”

Trueorfalse?

Pythonisproprietarysoftwarewhichisexpensivetobuy

Trueorfalse?

PythonwaswrittenbyBillGates

Trueorfalse?

YouTubeiswritteninPython

Trueorfalse?

Activity2.2

Makeanoteofwhattheseusefulkeyboardshortcutsdo.

Keyboardshortcut

Whatdoesthekeyboardshortcutdo?

Controlc

Controlv

Controla

Controlx

Controlf

Controln

Controlp

Controls

Controlz

Activity2.3

Copyandrunthisprogram:

print("Thisistheend")

print("Holdyourbreathandcounttoten”)

print("Feeltheearthmoveandthen”)

print("Hearmyheartburstagain”)

Writeaprogramthatwritesfourlinesofthelyricsofyourfavouritesongonthescreen.

Activity2.4

Copyandrunthisprogram.

print("therainfalls","fromthesky")

Nowanswerthesequestions:

Whathappens?

Whateffectdoesthe”,“have?

Activity2.5

Escapesequencescanbeusedtoalterhowtheinformationisdisplayedonthescreen.Anescapesequenceisabackslash“\”.

Experimentwiththeseescapesequencesandcompletethetable.

print("\tQuestionwhatgoeswoof\t\tdogs\t\t\trabbits")

print("\n\nwhatkindofsnakeisgoodatmaths?\n\nAnadder\n\n")

print("\n\nGoodbye\n\n")

Hint:UsealtptodisplaythelastcommandenteredintheIDLEshell.

Escapesequence

Effect

\t

\n

\\

\’

\”

Activity2.6

Printthistextusingjustonelineofcode.

Help,Ineedsomebody

Help,notjustanybody

Help,youknow,Ineedsomeone

Activity2.7

Writeaprogramusingprintcommandstodisplayyourinitialsfivecharactershighonthescreen.

Xxxx

XxxxX

XxxXxxxxx

Xxxxx

Xxxx

Activity2.8

Analgorithmisasequenceofstepsneededtoperformaparticulartask.Algorithmscanberepresentedindifferentways.

Matchthewordstotherepresentations.

flowchart pseudocode structuredEnglish

writtendescription programcode

A

B

RECEIVEmyNameFROM(STRING)KEYBOARD

RECEIVEmyAgeFROM(INTEGER)KEYBOARD

SETAgeInTenTOmyAge+10

SENDmyName“willbe”AgeInTen“in10yearstime”TODISPLAY

C

Writeaprogramthatpromptstheusertoentertheirnameandage.Theprogramthenadds10ontotheageanddisplaysthetext“<nameentered>willbe<age+10>intenyearstime.”

D

E

Ifanimalhas4legsthen

Ifanimalhasatailthen

Ifanimalanswersto“puss”then

animal=cat

endif

endif

endif

Activity2.9

ExploreASCIIart(Wikipedia)andwriteaPythonprogramtodisplayyourASCIIartcreation.

.--./\____

'--'/__\(^._.^)~<(o.o)>

Lesson3activities

Activity3.1

Copyandruntheselinesofcode.Completethetabletoexplainwhatthemathematicaloperatorsdo.

>>>60/5

>>>987+34

>>>564*89

>>>2**5

>>>43-5

>>>11//2

>>>11%2

Mathematicaloperatorsymbol

Operation

/

+

*

**

-

//

%

Activity3.2

Makeupsomemathematicalcalculationsofyourownandaddanexampletothetableforeachmathematicaloperator.

Mathematicaloperatorsymbol

Operation

Example

Answer

/

divide

+

add

*

multiply

**

exponential

-

subtract

//

integerdivision

%

modulus(remainderafterthedivision)

Activity3.3

Writeaprogramtodisplaythistextonthescreenandfillinthemissingnumber.

8catshave4legseach

Thecatshave___legsintotal

Writeaprogramtodisplaythistextonthescreenandfillinthemissingnumber.

Afarmerwith1089sheepsells56ofthem

Thefarmerhas_____sheepleft

Writeaprogramtodisplaythistextonthescreenandfillinthemissingnumber.

4childrenpick56flowerseach

Thechildreneachhave____flowers

Activity3.4

Copyandruntheselinesofcode.Whateffectdotheparentheses()have?

>>>5*3/6+4

>>>(5*3)/(6+4)

Activity3.5

Predictwhatyouthinkwillbedisplayedonthescreenwhenthislineofcodeisexecuted.

15/2*3+2

Nowcopyandrunthecode.Explaintheansweryouget.Isitwhatyoupredicted?

Activity3.6

Makeupsomemultiple-choicequestionsonprecedence.Eachquestionmusthavefourpossibleanswers,oneofwhichiscorrect.

Herearetwoexamples:

Whatisthecorrectanswertothefollowingexpression?

>>>7+4*5

55

27

16

33

Whatisthecorrectanswertothefollowingexpression?

>>>6-2/2+5

0.57

10

7

11

CheckyouranswersarecorrectbyusingtheinteractivePythonshell.

Tryyourquestionsoutonotherpeople.Youmustbeabletoexplaintothemwhytheanswersarecorrect.

Activity3.7

Deviseyourownmnemonicforrememberingtheorderofprecedence.

Pythonorderofprecedence

Mnemonic

Parenthesis(brackets)

Exponential

Divisionandmultiplication

Additionandsubtraction

Lesson4activities

Activity4.1

Copyandrunthiscodeandexplaintheresult.

>>>printhelloworld

Activity4.2

Copyandrunthiscodeandexplaintheresult.

>>>print("helloworld")

Activity4.3

Pythonproducesdifferenttypesoferror.Matchupthetypeoferrorwithitsdescription.

Typeoferror

TypeError

RuntimeError

NameError

ZeroDivisionError

KeyBoardInterrupt

Descriptionoftheerror

Dividinganumberbyzero.

Whenaprogramisinterruptedfromthekeyboardbypressingcontrol+c.

Whenanameisusedthatisnotknownabout(oftenavariablenamethatismisspelt).

Whenanoperationisattemptthatisinvalidforthattypeofdata.

Anerroroccurswhentheprogramisrunning.

ExperimentwithPythontoseeifyoucancreateeachtypeoferror.

Hint:AfulllistofPythonerrorscanbefoundhere:

/python/standard_exceptions.htm

Activity4.4

Copyandrunthiscodeandexplaintheresult.

#ProgrammerAmySmith6thSeptember2013

Activity4.5

Usefile/newwindowtoopenascriptfileintheIDLE.

Copythiscodeintothefile.

print("Solongandthanksforallthefish")

print("Theansweris",6*7)

Savethefileusingfile/save.Alwaysgivethefilenameanextensionof.py.Useameaningfulfilenameandstoreinasuitablefolder.

Runthecommandsbyusingrun/runmodule

ClosePythonandthenrestartPython,openthefileandruntheprogramagain.

Activity4.6

FollowingthesamestepsasinActivity4.5,writeaprogramthatdisplaysyournameandthenyourage.

Hint:Usefile/newwindowandsavethefileusingfile/save.Don’tforgettouseameaningfulfilename.

Activity4.7

UsingthePythonIDLE

WriteyourownsummarysheettodescribehowtorunPythonprograms,includinghowtosaveandopen.pyfiles.Includeanyothercommandsthatyouhavefounduseful.

UsingthePythonIDLE

Howtoopenanewwindow

Howtosaveafile

Howtoopenafile

Howtorunaprogram

Usefultips

altp

Displaysthelastlineyouentered

Commandsinthefilearenotcolourcoded

Saveasa.pyfile

Lesson5activities

Activity5.1

Wheredoesthename‘Boolean’comefrom?

BooleanvariablesarenamedafterGeorgeBoolewhoinventedthemathematicsofdigitallogic.FindapictureofGeorgeBooleandinsertithere.Whenwasheborn?

Activity5.2

Datatypes

Usethe“type”functiontofindoutthedatatypesforthesevalues.

>>>type("Fred")

>>>type(198)

>>>type(88.9)

>>>type(True)

>>>type(False)

Hint:RememberthatTrueandFalsemuststartwithacapitalletter.

Activity5.3

Thetypefunctionreturnsthedatatypeofanexpression.

Foreachoftheseexpressions,firstpredictthedatatypethenusethetypecommandtoseeifyourpredictionwascorrect.

Expression

Predicteddatatype

Typecommand

Result

“helloworld”

type("helloworld")

False

type(False)

15

type(15)

35.6

type(35.6)

-999

type(-999)

“15”

type(“15”)

“False”

type(“False”)

True

type(True)

0.001

type(0.001)

Activity5.4

Theinteractiveshellisausefulplacetoexplorevariables.

Copyandrunthiscodeintheinteractiveshell.

myName="FredSmith"

myAge=14

print(myName,myAge)

CreateavariablecalledmyNameandassignittoyourname.

CreateavariablecalledmyAgeandassignittoyourage

CreateavariablecalledmyEyesandassignittoyoureyecolour.

CreateavariablecalledmyHeightandassignittoyourheight.

Writethecommandstodisplayonthescreenyourname,age,eyecolourandheight.

Hint:Rememberthatasingle‘=’isusedtoassignavaluetoavariable.

Activity5.5

Variablenames

Aprogrammeristryingtodecideonavalidnameforavariablethatrepresentsahousenumber.

Whichofthefollowingvariableassignmentsarevalid?Whyaretheothersnotvalid?

Validorinvalidvariablename?

Reasonwhynotvalid

8HouseNumber=288

houseNumber=288

houseNumber=288

house_number=288

import=288

Whattypeoferrordoyougetwhenusinganinvalidvariablename?

Activity5.6

Copyandrunthiscodeandexplaintheresult.

#ProgrammerAmyJones12/8/2013

#addstwonumbers

numberOne=15

numberTwo=23

answer=numberOne+numberTwo

print("Theansweris“,answer)

AmendtheprogramtoaddanothervariablecallednumberThree.Assignthevalue76tothisvariable.Theprogramshouldallupallthreenumbersandprinttheresult.

Activity5.7

DatatypesinPython

Completethistabletodescribethefourdatatypes.

Datatype

Pythonabbreviation

Explanation

Example

integer

int

string

str

float

float

boolean

bool

Hint:Quotationmarksareusedtoshowthestartandendpointofastring,e.g.“thisisastring”.

Lesson6activities

Activity6.1

Inputfunction

Theinputfunctionallowstheusertoinputavalueandassignittoavariable.

Copyandrunthisprogram.

myAnswer=input("Pleaseenteryourname:")

print(myAnswer)

Re-runtheprogramseveraltimes,enteringdifferentnameseachtime.

Writeaprogramthataskstheuserfortheirnameandfavouritefoodanddisplaystheseonthescreen.

Activity6.2

Intfunction

Copyandrunthisprogram.

age=input("Pleaseenteryourage:")

agePlusTen=age+10

print("Youwillbe",agePlusTen,"in10years")

Explainwhyitdoesnotwork.

Correcttheprogram.

Activity6.3

Writeaprogramthatasksyoutoenteranumberthendisplaysthenumberdoubled.

Activity6.4

Stringformatting

Thestringmethod.formatgivesyoumorecontrolovertheformattingofyouroutputthanprintingusingspace-separatedvalues.Thestringformattingcommandsaregivenincurlybrackets{}.

Copyandruntheselinesofcode:

>>>foodOne="fish"

>>>foodTwo="chips"

>>>print("{0}and{1}".format(foodOne,foodTwo))

fishandchips

>>>print("{1}and{0}".format(foodOne,foodTwo))

chipsandfish

>>>print("{1}{1}{1}and{0}{0}{0}".format(foodOne,foodTwo))

chipschipschipsandfishfishfish

Createthesevariables:

one=“cheese”

two=”onion”

Usethe.formatcommandtodisplay:

Myfavouritecrispsarecheeseandonion.Ilovethem!

cheeseandonionandcheeseandonionandcheeseandonion

cheesecheesecheeseandoniononiononion

Youguessedit.Thebestcrispsareonionand…cheese.

Tryalteringtheflavoursassignedtothevariablestoyourfavouriteflavour!Enjoy.

Activity6.5

Formattingnumbers

Youcanusethe.formatmethodtoformatthenumberofdecimalplaces.

Copyandruntheselinesofcode:

>>>number=98.1468297645

>>>print("Theansweris{0:.5f}".format(number))

Theansweris98.14683

>>>print("Theansweris{0:.4f}".format(number))

Theansweris98.1468

>>>print("Theansweris{0:.3f}".format(number))

Theansweris98.147

>>>print("Theansweris{0:.1f}".format(number))

Theansweris98.1

>>>print("Theansweris{0:.0f}".format(number))

Theansweris98

Assignthenumber765.87641987toavariableanddisplaythenumberwith5,2andnodecimalplacesusingthe.formatcommand.

Activity6.6

Writeaprogramthataskshowmuchyourbillisatarestaurantandthenasksyoutoenterthe%youwanttogiveinatip.Theprogramshoulddisplaytheamountoftiptogivetothewaiter.

Amendtheprogramsothatitalsodisplaysthetotalcostofthemealincludingthetip.

Activity6.7

Writeaprogramthatdisplaysthesquareofanumber.

Writeaprogramthatpromptsforanumberandthendisplaysthecubeofanumber.

Writeaprogramtofindtheperimeterofasquare.

Writeaprogramtofindtheperimeterofarectangle.

Writeaprogramthatfindstheareaofasquare.

Writeaprogramthatfindstheareaofacube.

Writeaprogramtoconvertfrompoundstoeuros.

Hint:Alltheseprogramsshouldpromptfortheinputinformationanddisplaytheresultappropriately.

Lesson7activities

Activity7.1

Relationaloperators

Passwordcheckingisanexampleofarelationaloperator.Ifthepasswordenteredisthesameasthepasswordstoredthentheconditionistrue.Theoperatoris‘isequalto’.

Brainstormotherexamplesofconditionstatementsanddecidewhattheoperatoris.

Relationstatement

Operator

Activity7.2

CompletethistableofthePythonrelationaloperators.Giveanexampleofeachandsaywhetheritwillevaluatetotrueorfalse.

Relationaloperator

Operator

Example

Evaluatesto

Equalto

Notequalto

Greaterthan

Greaterthanorequalto

Lessthan

Lessthanorequalto

TryoutyourexpressionsbytypingthemintothePythoninteractiveshell.

Activity7.3

Greaterthanandlessthan

Findawaythatworksforyouofrememberingthedifferencebetween“l(fā)essthan”<and“greaterthan”>.

Hint:Asthereareonlytwooptionsyouonlyneedtolearnone!

Operator

>

<

Operatormeaning

Greaterthan

Lessthan

HowIrememberthis

Activity7.4

Thisprogramasksifitissnowingandifsotellsyoutotakeasledgeotherwisetohaveagoodday.Theconditionismissing.

Copyandcompletetheconditiontomaketheprogramworkcorrectly.

Activity7.5

Whatconditionisneededinthisprogramtodisplay‘pass’iftheexammarkis40ormore?

Copyandcompletetheconditiontomaketheprogramworkcorrectly.

Activity7.6

Writeaprogramthatasksyoutoenterthecolourofthelightatapedestriancrossing.Ifthelightisgreenittellsyouitissafetocross,otherwiseittellsyoutostop.

Activity7.7

Writeaprogramthatasksyouforyourpassword.Itthenasksyoutore-enteryourpassword.Iftheyarethesamethemessage“accessgranted”isdisplayed.Ifthepasswordsarenotthesamethemessage“accessdenied”isdisplayed.

Lesson8activities

Activity8.1

Usingelif

Thisprogramsimulatesafortunecookie.Arandomnumberisusedtodecideyour‘fortune’.

Copyandrunthisprogram.

#arandomnumberisgivenbytherandint()function

importrandom

answer=random.randint(1,6)

ifanswer==1:

print("Youwillmakeanewfriendthisweek")

elifanswer==2:

print("YouwilldowellinyourGCSEs")

elifanswer==3:

print("Youwillfindsomethingyouthoughtyou’dlost")

Theprogramisnotyetcomplete.Includeyourown‘fortunes’forthenumbers4,5and6.

Note:random.randint(1,6)isafunctionthatreturnsarandomnumberbetween1and6.The‘importrandom’commandallowstheprogramtoaccesstherandom.randint()function.

Activity8.2

Writingreadablecode:astyleguide

Programcodeisreadmoreoftenthatitiswritten.HerearesomeguidelinesonhowtowritePythoncodesothatitiseasytoread.

AstyleguideforPythoncode

Indentbyfourspacesforeachindentationlevel.

Useblanklinestoseparatedifferentpartsoftheprogram.

Usetwoblanklinestoseparatefunctions.

Choosemeaningfulnamesforvariables,usingCamelCaseorwithwordsseparatedbyunderscores.

Putimportsatthetopofthefile.

Includeonespacearoundeachsideofanassignmentandotheroperators.

Usecompletesentenceswiththefirstwordcapitalisedforcomments.

Writecommentsthataddclarityandexplainwhattheprogramdoes.Donotsimplyrepeatwhatthecodealreadysays.

Writefunctionnamesinlowercase,withwordsseparatedbyunderscores.

Usemeaningfulfunctionnameswhichdescribethepurposeofthefunction.

WriteconstantsinCAPITAL_LETTERS.

Usemeaningfulconstantnames,whichdescribethepurposeoftheconstant.

Note:Functionsaresubprogramswhichstartwiththe“deffunction_name():.Constantsarevariableswhosevalueneverchanges.Youwillbecoveringfunctionsinlaterlessons.

Formoredetailsee

/dev/peps/pep-0008/

ApplytherulesinthestyleguideaboveforthisPythoncode.

defa(s):

ifs<50:

print("Youhavelost")

else:

print("Youhavewon")

Activity8.3

Selectsomeofyourprogramsandmakethemmorereadableusingtherulesinthestyleguide.

Lesson9activities

Activity9.1

Flowcharts

Flowchartscanbeusedtorepresentalgorithms.Identifytheflowchartsymbolsbelow.

Activity9.2

Studythisprogram.

#passwordchecking

password=input("Pleaseenterpassword:")

newPassword=input("Pleasere-enterpassword:")

ifpassword==newPassword:

print("Accessgranted")

else:

print("Accessdenied")

Drawtheflowchartforthisprogram.

Activity9.3

Studytheflowchart.

Writeaprogramtoimplementthisflowchart.

Activity9.4

Studytheflowchart.

Whatdoesthisflowchartdo?

Writetheprogramtoimplementthisflowchart.

Extension:Canyouextendtheprogramtodisplaywhethertheycanwatch15filmsor18films?

Activity9.5

BooleanOperators

Completethetableusingthelogical(Boolean)operatorsAND,ORandNOT.

Symbol

Description

Returnstrueifbothconditionsaretrue.

Returnstrueifanyoftheconditionsaretrue.

Reversestheoutcomeoftheexpression;truebecomesfalse,falsebecomestrue.

Activity9.6

Predicttheanswertotheconditionsandthenusetheinteractiveshelltotestyouranswer.

Condition

Yourprediction

(trueorfalse?)

Result

(78==10)or(6==7)

(78==10)or(6==6)

(78==10)and(6==6)

(1<10)and(2<10)

(1<10)or(2<10)

not(5==5)

not(6<4)

Hint:Tryaskingyourselfthequestions:

Iscondition_1trueORcondition_2true–ifYESthentheansweristrue.

Iscondition_1trueANDcondition_2true–ifYESthentheansweristrue.

Activity9.7

MakeupsomeBooleanoperatorquestionsofyourownandcheckyouranswersarecorrectbyusingtheinteractivePythonshell.

Hereisanexamplequestion:

>>>answer=50

>>>(answer<40)or(answer>80)

TrueorFalse?

Trythemoutonotherpeople.Makesureyoucanexplaintherightanswertothemiftheyneedyouto.

Activity9.8

Atruthtablelistsallthepossiblecombinationsoftrueandfalseoutcomesforeachcondition.

CompletethetruthtablesforANDandORoperators.

TruthtableshowingtrueandfalseANDconditions

Condition1

Condition2

Output

false

false

true

false

false

true

true

true

TruthtableshowingtrueandfalseORconditions

Condition1

Condition2

Output

false

false

true

false

false

true

true

true

Activity9.9

Writeaprogramthataskstheusertoenterayeargroupandtellsthemwhichkeystagethatyeargroupisin.

Keystage

Yeargroup

Keystage1

Years1and2

Keystage2

Years3,4,5and6

Keystage3

Years7,8and9

Keystage4

Years10and11

Extension:Whathappensiftheyeargroupenteredisgreaterthan11?Canyouimproveyourprogramtocopewiththis?

Activity9.10

Pythoncommandscolourcoding

ThePythonlanguageiscolourcoded.

Completethistable.

Colourcoding

Whatdoesitshow

Example

green

purple

black

orange

red

Lesson10activities

Activity10.1

Strings

Writetheindexpositionforeachcharacterinthestring.

H

e

l

l

o

w

o

r

l

d

!

Whatcharacterisatindex3?

Whatcharacterisatindex5?

Whatcharacterisatindex0?

Whatcharacterisatindex11?

Howmanycharactersarethereinthisstring?

Activity10.2

Usetheinteractiveshelltoexplorehowstringscanbeconcatenated.

MakeavariablecalledFirstNameandsetitsvaluetothestring“Fred”

MakeavariablecalledSecondNameandsetitsvaluetothestring“Smith”

MakeavariablecalledFullNameandsetitsvaluetothevalueofthevariablesFirstNameplusSecondName

PrintthevalueofthevariableFullName

Activity10.3

Slicingstrings

Partsofastringcanbeextracted(orsliced)bygivingtheindexlocationintheformat:

[startposition:endposition]

Startpositionistheindexatwhichtheslicestarts(rememberthatindexingstartsatzero).EndpositionistheindexAFTERthelastindexrequired.

Usetheinteractiveshelltoexplorehowstringscanbesliced.

Makeavariablecalledwordandsetitsvaluetothestring“PIZZA”.

>>>word="PIZZA"

P

I

Z

Z

A

0

1

2

3

4

Whatdothesecommandsdo?

>>>word[2:5]

>>>word[1:2]

>>>word[0:3]

>>>word[0:5]

Hint:Rememberthattheindexstartsatzeronotone.

Activity10.4

Avariablehasbeencreatedandassignedthestring“watch#bbcclicktoday”

myVariable=“watch#bbcclicktoday”

w

a

t

c

h

#

b

b

c

c

l

i

c

k

t

o

d

a

y

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

Whatcommandwouldyouusetoextractthefollowingslices?

#bbcclick

watch

today

Checkyouranswersusingtheinteractiveshell.

Activity10.5

Usingstringmethods

Anyvariablewithastringassignedisamemberoftheclasscalledstring.Stringmethodscanbeusedtomanipulatethatstring.

Explorestringmethodsbyworkingthroughthesecommandsintheinteractiveshellanddescribingwhathappens.

>>>myVariable="There'sastarmanwaitinginthesky"

>>>myVariable.upper()

>>>myVariable.replace("a","x")

>>>myVariable.title()

>>>myVariable.swapcase()

Activity10.6

Thestring.formatmethodrevisited:usingthestring.formatmethodtoformatoutput

Therearetwowaystooutputinformationtothescreen.Usingtheprint()functionorbygivingtheexpression.

Trythesenow:

>>>myName="DavidBowie"

>>>print(myName)

DavidBowie

>>>myName

'DavidBowie'

Thestring.formatisusedtogivemorecontroloverformatting.

Itallowsyoutouseplaceholdersandthenspecifythevariableyouwanttoprintinthestring.Theplaceholdersareshownusing{}.

>>>first="David"

>>>second="Bowie"

>>>print("Thebestmusicisfrom{0}{1}!".format(first,second))

ThebestmusicisfromDavidBowie!

Italsoallowsyoutochoosehowtoformattheoutput.

Lesson11activities

Activity11.1

Lists(arrays)

Completethistabletosummarisethelistcommands.

Thingstodowithlists

Commands

Createalist

Referenceaniteminalist

Deleteaniteminalist

Appendanitemtotheendofalist

Activity11.2

Lists(arrays)

Alistisadatastructurethatstoresasetofelements.Listsareassignedtoanameusingsquarebrackets.

>>>mylist=["apple","oranges","lemon","pear","lime"]

apples

oranges

lemon

pear

lime

0

1

2

3

4

Eachelementinalisthasanindexlocation.Thefirstelementofthelistisinpositionzero(0).

Elementsofalistarereferencedusingtheirindexlocation(anintegernumber).

Listname[index]

Arangeofelementscanbedisplayedusing

[startindex:endindex]

Startindexisthepositiontostartat(rememberthatindexingstartsatzero).EndpositionistheindexAFTERtheindexrequired.

Makethislistandexperimentwiththelistcommands.

>>>mylist=["apple","orange","lemon","pear","lime"]

Whatdoesmylist[1]display?

Whatdoesmylist[1:3]display?

Whatdoesmylist[-1]display?

Whatcommandwilldisplayjustapple?

Whatcommandwilldisplaylemonandpear?

Makeanewlistcalledmyfoodcontainingyourfivefavouritefoods.

Displaythewholelist.

Displaythefooditematindexposition3.

Displaythefooditematindexposition0.

Displaythefooditemsatindexposition1to4.

Activity11.3

Usinglists

MakethelistthatcontainstheclassmarksforAmyJones.

Marks=['Amy','Jones','English',67,'Maths',76,'ComputerScience',96]

TheEnglishteacherhasenteredAmy’smarkincorrectly;itshouldbe72not67.Alterthisiteminthelist.

AddthemarkforPhysicstotheendofthelist.“Physics”,65

Remove“Maths”andthescore76fromthelist.

Writeaprogramtofindtheaveragescoreforthethreesubjects(English,ComputerScienceandPhysics).

Activity11.4

UsingPythondocshelp

Selecthelp/pythondocsthenselectthePythontutorialandgoto3.1.4Lists.

Readthroughthediscussionoflistsandtryouttheexamples.Makeanoteofthreemorefactsaboutliststoshareinthenextlesson.

Pythonisaverypowerfulprogramminglanguagewhichisusedinuniversitiesandcommercialorganisations.YoudonotneedtoknowallthedetailsprovidedinthePythondocsbut,withpractice,youshouldbeabletofindinformationaboutPythonthatcanbeveryuseful.

Lesson12activities

Activity12.1

Forloops

Copyandrunthisprogram.

Writeaprogramthatprintsout“IlikeKateBush”10times.

Activity12.2

Copyandrunthisprogram:

fornumberinrange(10):

print(number)

Explainwhatthisprogramdoes.

Writeaprogramthatprintsthenumbersfrom1to15.

Writeaprogramthatprintsthenumbersfrom1to8,withthesquareofeachnumber,bothonthesameline.

Writeaprogramthatprintsoutthe9timestable(upto20x9).

Writeaprogramthataskstheuserwhichtimestabletheywantandthendisplaysthattable.

Writeaprogramthatasksforastartvalueandanendvalueandthencountsinfivesbetweenthosenumbers.Hint:range(startvalue,endvalue,step)

Activity12.3

Copythisprogramintoafileandruntheprogram.

Explainthepurposeofthe‘name’variable.

Writeaprogramthatcreatesalistofthingsyouwouldtaketoadesertisland.Theprogramshouldthendisplayeachiteminthelistalineatatime.

Activity12.4

Re-arrangetheprogramstatementstowriteaprogramthatwillprintoutthenamesoftheanimalsthatbeginwiththecharacter‘c’.

print(next)

ifnext[0]=="c":

myList=["cat","dog","cow","donkey","rabbit","canary"]

fornextinmyList:

Activity12.5

Studythisprogram.

Whatwilltheprogramdo?

Explainwhatthevariablenextisusedfor?

Explainwhatthevariablecountisusedfor?

Whatdoeslen(myNumbers)do?

Whathappensifyouaddorappendmorenumbersinthelist?

Ifaprintstatementwasaddedtotheforloop,asshownbelow,whatwouldbedisplayed?

Activity12.6

Writeaprogramthatfindsthelargestnumberinthislist.

myNumbers=[19,6,7,9,2,25,16]

Lesson13activities

Activity13.1

Whilecommand

Whatdoesthiswhilecommanddo?

Whatistheconditionthatisbeingtestedandhowdoesitchange?

Activity13.2

Writeaprogramthataskstheuseriftheyarehungry.Whiletheyreply‘N’theprogramrepeatsthequestion,showinghowmanytimes