Fix typos and add Python files

thinkcspy/Chapter-11-Exercises/Exercises.md

@@ -1,7 +1,7 @@
 # Exercises
 This lesson only had five problems, and thank goodness for that, because problem 4 really threw me for a loop. I've included all 5 here, because there are so few problems and because I genuinely found them all to be interesting problems. 
 
-Also I kept getting tripped up with how I interpreted the numbers from the files vs how Python interpreted them. Because they were coming from a file, those numbers were interpreted as strings, not numbers. You'd think that after my first encounter with this, I'd understand that, but I was literally still struggling with that on problem 5 lol. 
+Also, I kept getting tripped up with how I interpreted the numbers from the files vs how Python interpreted them. Because they were coming from a file, those numbers were interpreted as strings, not numbers. You'd think that after my first encounter with this, I'd understand that, but I was literally still struggling with that on problem 5 lol. 
 
 Anyway, enough talk. Let's go through the exercises. 
 
@@ -395,7 +395,7 @@ Problem 5
 
 > At the bottom of this page is a very long file called `mystery.txt` The lines of this file contain either the word UP or DOWN or a pair of numbers. UP and DOWN are instructions for a turtle to lift up or put down its tail. The pairs of numbers are some x,y coordinates. Write a program that reads the file `mystery.txt` and uses the turtle to draw the picture described by the commands and the set of points.
 
-It's long so, I'll just link to the data in `mystery.txt` [here](Exercises/mystery.txt.md). 
+It's long, so I'll just link to the data in `mystery.txt` [here](Exercises/mystery.txt.md). 
 
 Drawing the image was relatively straightforward. It was getting the world coordinates that was challenging, even though I literally just did the same thing in the previous problem. 
 
@@ -410,7 +410,7 @@ Anywho, here's my solution:
 # Chapter 11
 # Problem 5
 
- import turtle
+import turtle
 
 def getMinMax():
     #get world coordinates

thinkcspy/Chapter-11-Exercises/Python-files/Problem1.py

@@ -0,0 +1,12 @@
+# Runestone.Academy thinkcspy course
+# Chapter 11
+# Problem 1
+
+sdfile = open("studentdata.txt", "r")
+
+for line in sdfile:
+    student = line.split()
+    if len(student[1:]) > 6:
+        print(student[0])
+    
+sdfile.close()

thinkcspy/Chapter-11-Exercises/Python-files/Problem2.py

@@ -0,0 +1,21 @@
+# Runestone.Academy thinkcspy course
+# Chapter 11
+# Problem 2
+
+sdfile = open("studentdata.txt", "r")
+
+for line in sdfile:
+    student = line.split()
+    sum = 0
+    avg = 0
+    count = len(student[1:])
+    
+    for grade in student:
+        if grade != student[0]:
+            sum += int(grade)
+            
+    avg = sum/count
+    
+    print(student[0], "-", avg)
+    
+sdfile.close()

thinkcspy/Chapter-11-Exercises/Python-files/Problem3.py

@@ -0,0 +1,23 @@
+# Runestone.Academy thinkcspy course
+# Chapter 11
+# Problem 3
+
+sdfile = open("studentdata.txt", "r")
+
+for line in sdfile:
+    student = line.split()
+    mingrade = student[1]
+    maxgrade = student[1]
+    
+    for grade in student:
+        if grade != student[0]:
+            if int(grade) < int(mingrade):
+                mingrade = grade
+            if int(grade) > int(maxgrade):
+                maxgrade = grade
+                
+    outputText = "{} - minimum score:{}; maximum score:{}".format(student[0], mingrade, maxgrade)
+                
+    print(outputText)
+    
+sdfile.close()

thinkcspy/Chapter-11-Exercises/Python-files/Problem4.py

@@ -0,0 +1,95 @@
+# Runestone.Academy thinkcspy course
+# Chapter 11
+# Problem 4
+
+import turtle
+    
+def slope():
+    xlist = []
+    ylist = []
+    sumx = 0
+    sumy = 0
+    sumxy = 0
+    sumxsq = 0
+    count = 0     #n
+    meanx = 0
+    meany = 0
+    slope = 0     #m
+        
+    with open('labdata.txt') as lab:
+        for line in lab:
+            values = line.split()
+            xlist += [int(values[0])]
+            ylist += [int(values[1])]
+            x = int(values[0])
+            y = int(values[1])
+            sumx += x
+            sumy += y
+            sumxy += x*y
+            sumxsq += x**2
+            count += 1
+
+    meanx = sumx / count
+    meany = sumy / count
+    
+    slope = (sumxy - count*meanx*meany) / (sumxsq - count*meanx**2)
+        
+    plotRegression(xlist, ylist, meanx, meany, slope)
+    
+    
+    
+def plotRegression(xlist, ylist, meanx, meany, slope):
+    #set world coordinates
+    minx = xlist[0]
+    miny = ylist[0]
+    maxx = xlist[0]
+    maxy = ylist[0]
+    count = len(xlist)
+    num = 0
+    
+    while num < count:
+        if xlist[num] < minx:
+            minx = xlist[num]
+        if xlist[num] > maxx:
+            maxx = xlist[num]
+        if ylist[num] < miny:
+            miny = ylist[num]
+        if ylist[num] > maxy:
+            maxy = ylist[num]
+            
+        num += 1
+        
+    turtle.setworldcoordinates(minx-10, miny-10, maxx+10, maxy+10)
+    
+    #plot points
+    i = 0 
+    wn = turtle.Screen()
+    wn.bgcolor("#222")
+    ella = turtle.Turtle() #points from the labdata.txt
+    ella.color("pink")
+    maya = turtle.Turtle() #line of best fit (yplot)
+    maya.color("lightblue")
+            
+    for x in xlist:
+        j = 0
+        yplot = meany + slope*(x - meanx)
+        
+        while not j:
+            ella.up()
+            ella.goto(x, ylist[i])
+            ella.dot()
+            
+            if i != 0:
+                maya.goto(x, yplot)
+            else:
+                maya.up()
+                maya.goto(x, yplot)
+                maya.down()
+                
+            j += 1
+        
+        i += 1   
+
+    wn.exitonclick()
+    
+slope()

thinkcspy/Chapter-11-Exercises/Python-files/Problem5.py

@@ -0,0 +1,61 @@
+# Runestone.Academy thinkcspy course
+# Chapter 11
+# Problem 5
+
+import turtle
+
+def getMinMax():
+    #get world coordinates
+    minx = 0
+    miny = 0
+    maxx = 0
+    maxy = 0
+
+    with open('mystery.txt') as data:
+        for line in data:
+            values = line.split()
+            if values[0] != "UP" and values[0] != "DOWN": 
+                minx = int(values[0])
+                miny = int(values[1])
+                maxx = int(values[0])
+                maxy = int(values[1]) 
+            break
+                
+        for line in data:
+            values = line.split()
+            if values[0] != "UP" and values[0] != "DOWN":
+                if int(values[0]) < minx:
+                    minx = int(values[0])
+                if int(values[0]) > maxx:
+                    maxx = int(values[0])
+                if int(values[1]) < miny:
+                    miny = int(values[1])
+                if int(values[1]) > maxy:
+                    maxy = int(values[1])
+
+    draw(minx, miny, maxx, maxy)
+        
+        
+        
+def draw(minx, miny, maxx, maxy):    
+    turtle.setworldcoordinates(minx-10, miny-10, maxx+10, maxy+10)
+    
+    wn = turtle.Screen()
+    wn.bgcolor("#e0e0e0")
+    ella = turtle.Turtle()
+    ella.color("brown")
+    
+    with open('mystery.txt') as data:
+        for line in data:
+            values = line.split()
+            
+            if values[0] == "UP":
+                ella.up()
+            elif values[0] == "DOWN":
+                ella.down()
+            else:
+                x = int(values[0])
+                y = int(values[1])
+                ella.goto(x,y)
+
+getMinMax()