Add Chapter 6 python files and fix grammar issues in readme

thinkcspy/Chapter-6-Exercises/Python-files/problem1.py

@@ -0,0 +1,33 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 1
+
+import turtle
+
+def drawSquare(t, sz):
+    """Get turtle t to draw a square of sz side"""
+
+    for i in range(4):
+        t.forward(sz)
+        t.left(90)
+
+wn = turtle.Screen()
+wn.bgcolor("lightgreen")
+
+alex = turtle.Turtle()
+alex.color("pink")
+alex.pensize(2)
+
+
+def drawManySquares(tt, num):
+    for i in range(num):
+        drawSquare(tt, 20)
+        tt.up()
+        tt.forward(30)
+        tt.down()
+        
+
+drawManySquares(alex, 5)        
+        
+
+wn.exitonclick()

thinkcspy/Chapter-6-Exercises/Python-files/problem10.py

@@ -0,0 +1,34 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 10
+
+import turtle
+
+def drawStar(t):
+    for i in range(5):
+        t.left(144)
+        t.forward(-100)
+
+def drawFiveStars(tt):
+    tt.up()
+    tt.goto(-180,50)
+    tt.down()
+    
+    for i in range(5):
+        drawStar(tt)
+        tt.up()
+        tt.forward(350)
+        tt.right(144)
+        tt.down()
+    
+wn = turtle.Screen()
+wn.bgcolor("tan")
+
+stella = turtle.Turtle()
+stella.color("purple")
+stella.pensize(2)
+stella.speed(10)
+    
+drawFiveStars(stella)
+
+wn.exitonclick()

thinkcspy/Chapter-6-Exercises/Python-files/problem11.py

@@ -0,0 +1,39 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 11
+
+import turtle
+
+def drawStar(t, numSides, sideLength):
+    angle = 180 - 180/numSides
+    
+    t.up()
+    t.goto(sideLength/2,0)
+    t.down()
+    
+    for i in range(numSides):
+        t.left(angle)
+        t.forward(sideLength)
+
+def checkSides(tt, sides, length):
+    if sides >= 3 and sides % 2 != 0:
+        print("What a beautiful star!")
+        drawStar(tt, sides, length)
+    else:
+        print("Oops! Your star must have an ODD number of at least 3 sides. Let's try that again!")
+
+    
+wn = turtle.Screen()
+wn.bgcolor("tan")
+
+stella = turtle.Turtle()
+stella.color("purple")
+stella.pensize(2)
+stella.speed(0)
+
+a = int(input("Help Stella draw a star! How many points does the star have?"))
+b = int(input("How long is each side?"))        
+
+checkSides(stella, a, b)
+
+wn.exitonclick()

thinkcspy/Chapter-6-Exercises/Python-files/problem12.py

@@ -0,0 +1,28 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 12
+
+import turtle
+
+def drawSprite(t, numSides, legLength):
+    angle = 360/numSides
+    
+    for i in range(numSides):
+        t.forward(legLength)
+        t.up()
+        t.forward(-legLength)    
+        t.right(angle)
+        t.down()
+
+
+wn = turtle.Screen()
+
+wn.bgcolor("tan")
+
+avery = turtle.Turtle()
+avery.color("brown")
+
+drawSprite(avery, 15, 120)
+
+    
+wn.exitonclick()

thinkcspy/Chapter-6-Exercises/Python-files/problem13.py

@@ -0,0 +1,14 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 13
+
+def sumTo(n):
+    # your code here
+    runningTotal = 0
+    
+    for counter in range(n):
+        runningTotal = runningTotal + (n+1)/2
+        
+    return runningTotal
+
+print(sumTo(10))

thinkcspy/Chapter-6-Exercises/Python-files/problem14.py

@@ -0,0 +1,14 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 14
+
+def mySqrt(n):
+    # your code here
+    oldGuess = n/2
+    
+    while oldGuess**2 != n:
+        oldGuess = (1/2)*(oldGuess+(n/oldGuess))
+    
+    return oldGuess
+    
+print(mySqrt(10000))

thinkcspy/Chapter-6-Exercises/Python-files/problem15.py

@@ -0,0 +1,18 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 15
+
+def myPi(iters):    
+    # Calculate an approximation of PI using the Leibniz
+    # approximation with iters number of iterations
+    
+    # your code here  
+    apprPi = 0
+    
+    for i in range(iters):
+        term = (-1)**i/(2*i+1)
+        apprPi += term
+    
+    return apprPi * 4
+        
+print(myPi(1000000))

thinkcspy/Chapter-6-Exercises/Python-files/problem16.py

@@ -0,0 +1,20 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 16
+
+import math
+
+def myPi(iters):
+    # Calculate an approximation of PI using the Madhava
+    # approximation with iters number of iterations
+
+    #your code here
+    apprPi = 0
+    
+    for i in range(iters):
+        term = (-1)**i/((2*i+1)*3**i)
+        apprPi += term
+    
+    return apprPi * math.sqrt(12)
+        
+print(myPi(10))

thinkcspy/Chapter-6-Exercises/Python-files/problem17.py

@@ -0,0 +1,32 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 17
+
+import turtle
+
+def drawSprite(t, numSides, legLength):
+    angle = 360/numSides
+    
+    for i in range(numSides):
+        t.forward(legLength)
+        t.up()
+        t.forward(-legLength)    
+        t.right(angle)
+        t.down()
+
+def fancySquare(tt, sz):
+    """Get turtle t to draw a square of sz side"""
+
+    for i in range(4):
+        drawSprite(tt, int(sz/10), int(sz/20))
+        tt.forward(sz)
+        tt.left(90)
+
+wn = turtle.Screen()
+wn.bgcolor("lightblue")
+
+alex = turtle.Turtle()
+alex.color("maroon")
+alex.pensize(2)
+
+fancySquare(alex, 100)

thinkcspy/Chapter-6-Exercises/Python-files/problem18.py

@@ -0,0 +1,56 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 18	
+
+import turtle
+
+def writeData(tt, height):
+    tt.up()
+    tt.left(90)
+    tt.forward(height+10)
+    tt.right(90)
+    tt.forward(10)
+    tt.write(str(height))
+    tt.forward(30)
+    tt.right(90)
+    tt.forward(height+10)
+    tt.left(90)
+    
+
+def drawBar(t, height):
+    """ Get turtle t to draw one bar, of height. """
+    t.begin_fill()               # start filling this shape
+    t.left(90)
+    t.forward(height)
+    t.right(90)
+    t.forward(40)
+    t.right(90)
+    t.forward(height)
+    t.left(90)
+    t.end_fill()                 # stop filling this shape
+
+
+
+xs = [48, 117, 200, 240, 160, 260, 220]  # here is the data
+maxheight = max(xs)+10
+numbars = len(xs)
+border = 10
+
+wn = turtle.Screen()             # Set up the window and its attributes
+wn.setworldcoordinates(0-border, 0-border, 40*numbars+border, maxheight+border)
+wn.bgcolor("lightblue")
+
+tess = turtle.Turtle()           # create tess and set some attributes
+tess.color("purple")
+tess.fillcolor("magenta")
+tess.pensize(3)
+
+alex = turtle.Turtle()
+alex.color("magenta")
+
+
+for a in xs:
+    drawBar(tess, a)
+    writeData(alex, a)
+
+wn.exitonclick()

thinkcspy/Chapter-6-Exercises/Python-files/problem2.py

@@ -0,0 +1,36 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 2
+
+import turtle
+
+def drawSquare(t, sz):
+    """Get turtle t to draw a square of sz side"""
+
+    for i in range(4):
+        t.forward(sz)
+        t.left(90)
+
+wn = turtle.Screen()
+wn.bgcolor("lightgreen")
+
+alex = turtle.Turtle()
+alex.color("pink")
+alex.pensize(2)
+
+
+def drawStackedSquares(tt, num):
+    for i in range(num):
+        drawSquare(tt, 20*(i+1))
+        tt.up()
+        tt.backward(10)
+        tt.left(90)
+        tt.backward(10)
+        tt.right(90)
+        tt.down()
+        
+
+drawStackedSquares(alex, 5)        
+        
+
+wn.exitonclick()

thinkcspy/Chapter-6-Exercises/Python-files/problem3.py

@@ -0,0 +1,25 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 3
+
+import turtle
+
+def drawPolygon(t, sideLength, numSides):
+    """Make turtle t draw a polygon."""
+    angle = 360/numSides
+    
+    for i in range(numSides):
+        t.forward(sideLength)
+        t.left(angle)
+
+
+wn = turtle.Screen()
+wn.bgcolor("lightgreen")
+
+tess = turtle.Turtle()
+tess.color("pink")
+tess.pensize(2)
+
+drawPolygon(tess,50,8) 
+
+wn.exitonclick()

thinkcspy/Chapter-6-Exercises/Python-files/problem4.py

@@ -0,0 +1,32 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 4
+
+import turtle
+
+def drawSquare(t, sz):
+    """Get turtle t to draw a square of sz side"""
+
+    for i in range(4):
+        t.forward(sz)
+        t.left(90)
+
+wn = turtle.Screen()
+wn.bgcolor("lightgreen")
+
+alex = turtle.Turtle()
+alex.color("blue")
+alex.pensize(2)
+alex.speed(10)
+
+
+def drawCircleSquares(tt, num):
+    for i in range(num):
+        drawSquare(tt, 80)
+        tt.right(15)
+        
+
+drawCircleSquares(alex, 25)        
+        
+
+wn.exitonclick()

thinkcspy/Chapter-6-Exercises/Python-files/problem5.py

@@ -0,0 +1,38 @@
+# Runestone.Academy thinkcspy course
+# Chapter 6
+# Problem 5
+
+import turtle
+
+def drawSquareSpiral(t, sz, num, angle):
+    """Get turtle t to draw a square of sz side"""
+    
+    for i in range(num):
+        t.forward(sz*i)
+        t.left(angle)
+
+wn = turtle.Screen()
+wn.setworldcoordinates(-300,-300,300,300)
+wn.bgcolor("lightgreen")
+
+
+alex = turtle.Turtle()
+alex.color("blue")
+alex.speed(0)
+alex.up()
+alex.goto(-150,0)
+alex.down()
+
+tess = turtle.Turtle()
+tess.color("purple")
+tess.speed(0)
+tess.up()
+tess.goto(150,0)
+tess.down()
+
+drawSquareSpiral(alex,2,100,90)
+
+drawSquareSpiral(tess,2,100,91)
+        
+
+wn.exitonclick()