Edit typos and grammar and add python files

thinkcspy/Chapter-4-Exercises/Python-Files/problem10.py

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+# Runestone.Academy thinkcspy course
+# Chapter 4
+# Problem 10
+
+import turtle
+wn = turtle.Screen()
+
+wn.bgcolor("lightgreen")
+
+stella = turtle.Turtle()
+stella.color("blue")
+stella.shape("turtle")
+
+avery = turtle.Turtle()
+avery.color("blue")
+
+stella.up()
+avery.up()
+
+stella.stamp()
+
+for i in range(12):
+    stella.forward(100)
+    stella.stamp()
+    
+    avery.forward(70)
+    avery.down()
+    avery.forward(10)
+    avery.up()
+    
+    stella.forward(-100)    
+    avery.forward(-80)    
+    
+    stella.right(30)
+    avery.right(30)
+    
+wn.exitonclick()

thinkcspy/Chapter-4-Exercises/Python-Files/problem11.py

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+# Runestone.Academy thinkcspy course
+# Chapter 4
+# Problem 11
+
+import turtle
+wn = turtle.Screen()
+
+wn.bgcolor("black")
+
+stella = turtle.Turtle()
+stella.color("lightblue")
+stella.speed(10)
+
+avery = turtle.Turtle()
+avery.color("purple")
+avery.speed(10)
+avery.up()
+avery.right(90)
+avery.down()
+
+missy = turtle.Turtle()
+missy.color("purple")
+missy.speed(10)
+missy.up()
+missy.left(90)
+missy.down()
+
+dun = turtle.Turtle()
+dun.color("gold")
+dun.speed(10)
+dun.up()
+dun.left(90)
+dun.forward(30)
+dun.right(90)
+dun.down()
+
+for i in range(8):
+    stella.left(135)
+    stella.forward(-120)
+    
+    avery.right(45)
+    avery.forward(-50)
+
+for i in range(30, -32, -1):
+    missy.forward(i)
+    missy.left(20)
+
+dun.forward(120)
+dun.left(120)
+dun.forward(70)
+for i in range(2):
+    dun.left(120)
+    dun.forward(30)
+    dun.right(120)
+    dun.forward(30)
+dun.left(120)
+dun.forward(70)
+    
+wn.exitonclick()

thinkcspy/Chapter-4-Exercises/Python-Files/problem4.py

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+# Runestone.Academy thinkcspy course
+# Chapter 4
+# Problem 4
+
+for i in [12, 10, 32, 3, 66, 17, 42, 99, 20]:
+    print(i)
+
+for i in [12, 10, 32, 3, 66, 17, 42, 99, 20]:
+    print("The square of", i,"is", i**2)

thinkcspy/Chapter-4-Exercises/Python-Files/problem5.py

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+# Runestone.Academy thinkcspy course
+# Chapter 4
+# Problem 5
+
+import turtle
+wn = turtle.Screen()
+avery = turtle.Turtle()
+avery.color("blue")
+dun = turtle.Turtle()
+dun.color("pink")
+elliot = turtle.Turtle()
+elliot.color("lime")
+missy = turtle.Turtle()
+missy.color("yellow")
+
+for i in range(3):
+    avery.forward(50)
+    avery.left(120) 
+    
+for i in range(4):
+    dun.backward(70)
+    dun.left(90)
+    
+for i in range(6):
+    elliot.left(60)
+    elliot.forward(40)
+    
+for i in range(8):
+    missy.right(45)
+    missy.backward(80)
+    
+wn.exitonclick()

thinkcspy/Chapter-4-Exercises/Python-Files/problem9.py

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+# Runestone.Academy thinkcspy course
+# Chapter 4
+# Problem 9
+
+import turtle
+wn = turtle.Screen()
+
+stella = turtle.Turtle()
+stella.color("yellow")
+
+stella.up()
+stella.forward(-50)
+stella.down()
+
+for i in range(5):
+    stella.left(144)
+    stella.forward(-100)
+
+wn.exitonclick()