More Exercises with Loops Turtle Graphics · More Exercises with Loops Turtle Graphics CS 8:...

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More Exercises with Loops Turtle Graphics CS 8: Introduction to Computer Science, Spring 2019 Lecture #8 Ziad Matni, Ph.D. Dept. of Computer Science, UCSB

Transcript of More Exercises with Loops Turtle Graphics · More Exercises with Loops Turtle Graphics CS 8:...

  • MoreExerciseswithLoopsTurtleGraphics

    CS8:IntroductiontoComputerScience,Spring2019Lecture#8

    ZiadMatni,Ph.D.

    Dept.ofComputerScience,UCSB

  • Administrative•  Nohomeworkthisweek!•  Lab03–dueonSundaybymidnight(11:59pm)onGradescope!

    •  MidtermExam#1isonWednesday!

    4/30/19 Matni,CS8,Sp19 2

  • Midterm#1Exam•  May2nd,2:00–3:15PMinTHISclassroom(unlessyouareaDSPstudent)•  Come10MINUTESEARLYastheremightbepre-assignedseating•  CLOSEDBOOK!Butyoucanbring1pageofnotes

    –  Single-sideonly,8.5”x11”–  Hand-writtenorcomputerprintedisOK!–  Mustturnitinwiththeexamwhendone–  Nocalculators/cellphones/anytypeofcomputer

    •  BringyourUCSBIDwithyou.NOEXCEPTIONS.

    4/30/19 Matni,CS8,Sp19 3

  • Midterm#1ExamWHAT’SONIT?!

    •  Everything–  ReviewALLlectures–  ReviewALLreadings–  ReviewALLlabs–  ReviewALLhomework

    4/30/19 Matni,CS8,Sp19 4

  • Midterm#1ExamSAMPLEQUESTIONS?!?!?!?!?!?!

    •  Yes!SeeStudyGuideontheclasswebsite!

    4/30/19 Matni,CS8,Sp19 5

  • LectureOutline•  Moreexercisewithloopsusingforandwhile

    4/30/19 Matni,CS8,Sp19 6

  • Re:MutabilityofVariables•  Rememberthat“immutable”variablesarenot“unchangeable”

    –  Eg.int,str,float,etc…

    •  TheyCANbechanged,iftheyareRE-ASSIGNED–  INSIDEafunction

    •  Whateverchangeswemakeinsideafunctionwillremaininsidethefunction–  ButwecanalwaysRETURNthesevariablessothatthechangesare

    reflectedoutsidethefunction

    4/30/19 Matni,CS8,Sp19 7

  • Re:MutabilityofVariablesdefswap(a,b):temp=aa=bb=temp

    x=3y=33swap(x,y)#what’sx?y?

    4/30/19 Matni,CS8,Sp19 8

    defswap(a,b):temp=aa=bb=tempreturna,b

    x=3y=33x,y=swap(x,y)#what’sx?y?

  • IntroducingTurtleGraphics!•  AnicewaytogetintroducedtosimplegraphicsusingPython

    •  Youhavetofirstimportturtle

    •  YoucanthenuseitasperthedemoI’mabouttogive…

    4/30/19 Matni,CS8,Sp19 9

  • BasicTurtleCommandsimportturtletimmy=turtle.Turtle()#Settheturtleobject,callittimmy!timmy.forward(100) #Drawforwards100pixelstimmy.right(90) #Turntheturtle90degreestotherighttimmy.backwards(50) #Drawbackwards50pixelstimmy.left(45) #Turntheturtle45degreestothelefttimmy.color("blue")#Maketimmybluetimmy.pensize(3) #Setthewidthofthepentimmy.penup() #Putpenup(canmoveitw/odrawing)timmy.pendown() #Putpendown(candrawagain)4/30/19 Matni,CS8,Sp19 10

  • WhatWillTheseDo?importturtle

    boris=turtle.Turtle()

    boris.color("blue")

    boris.forward(100)

    boris.right(90)

    boris.forward(100)

    boris.right(90)

    boris.forward(100)

    boris.right(90)

    boris.forward(100)

    boris.right(90)Matni,CS8,Sp19 11

    importturtlenatascha=turtle.Turtle()natascha.color("red")natascha.forward(100)natascha.left(60)natascha.forward(100)natascha.left(60)natascha.forward(100)natascha.left(60)natascha.forward(100)natascha.left(60)natascha.forward(100)natascha.left(60)natascha.forward(100)natascha.left(60)

  • SimplerDrawingByRepetition•  DrawingasquareusingTurtleandloops!

    defdrawSquare2(myTurtle,sideLength):foriinrange(4):myTurtle.forward(sideLength)myTurtle.right(90)

    4/30/19 Matni,CS8,Sp19 12Let’s try these out!

  • MoreDrawingAbstraction•  DrawingatriangleusingTurtleandloops!

    defdrawTriangle(myTurtle,sideLength):foriinrange(3): #draw3sides,not4myTurtle.forward(sideLength)myTurtle.right(120) #120°×3

    4/30/19 Matni,CS8,Sp19 13Let’s try these out!

  • MoreDrawingAbstraction•  DrawinganyregularpolygonusingTurtleandloops!

    defdrawPolygon(myTurtle,sideLength,numSides):turnAngle=360/numSidesforiinrange(numSides):myTurtle.forward(sideLength)myTurtle.right(turnAngle)

    4/30/19 Matni,CS8,Sp19 14Let’s try these out!

  • SimplerDrawingByRepetition•  DrawingaspiralusingTurtleandloops!

    defdrawSpiral(myTurtle,maxSide):forsideLengthinrange(1,maxSide+1,5):myTurtle.forward(sideLength)myTurtle.right(90)

    4/30/19 Matni,CS8,Sp19 15Let’s try these out!

  • ExampleforLoopusingaString•  Whatdoyouthinkthiscodedoes?s="Takemehome,countryroads"forcins:ifcin('a','e','i','o','u'): print("Vowelfound:",c)

    4/30/19 Matni,CS8,Sp19 16

  • Exampleforloopusingstring•  Whatdoyouthinkthiscodedoes?s="Takemehome,countryroads"t=0forcins:ifcin('a','e','i','o','u'): t+=1

    print("Therewere",t,"vowelsfound")

    4/30/19 Matni,CS8,Sp19 17

    #Accumulatedsum

    #Set-upforanaccumulatedsum

  • Exampleforloopusingstring•  Whatdoyouthinkthiscodedoes?s="TAKEMEHOME,COUNTRYROADS"t=0forcins:ifcin('a','e','i','o','u'): t+=1

    print("Therewere",t,"vowelsfound")

    4/30/19 Matni,CS8,Sp19 18

    #Accumulatedsum

    #Set-upforanaccumulatedsum

  • NestedLoops

    4/30/19 Matni,CS8,Sp19 19

    •  Whatwillthiscodedo?forpinrange(2):forqinrange(3): print("z",end="")

  • NestedLoops•  Whatwouldthisdo?listX=[[1,2,3], [4,5,6,7,8,9], ["a","b","c"]]

    foriinlistX:forjini: print(j,end="")

    4/30/19 Matni,CS8,Sp19 20

  • YOURTO-DOsq  Studyforthemidterm!q  NoHomeworkthisweek!q  FinishLab3(turnitinbySunday)

    q  Ensure(smiles–frowns)>0

    4/30/19 Matni,CS8,Sp19 21

  • 4/30/19 Matni,CS8,Sp19 22


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