diff --git a/thinkcspy/Chapter-7-Exercises/Python-files/Problem13.py b/thinkcspy/Chapter-7-Exercises/Python-files/Problem13.py
new file mode 100644
index 0000000..d7ccdf9
--- /dev/null
+++ b/thinkcspy/Chapter-7-Exercises/Python-files/Problem13.py
@@ -0,0 +1,41 @@
+# Runestone.Academy thinkcspy course
+# Chapter 7
+# Problem 13
+
+def isLeap(year):
+    # your code here
+    if (year % 4 == 0 and year % 100 != 0) or year % 400 == 0:
+        return True
+    else: 
+        return False
+
+def easter(year):
+    a = year % 19
+    b = year % 4
+    c = year % 7
+    d = (19 * a + 24) % 30
+    e = (2 * b + 4 * c + 6 * d + 5) % 7
+        
+    if year >= 1900 and year <= 2099:
+        if isLeap(year):
+            dateofeaster = 22 + d + e - 7
+        else:
+            dateofeaster = 22 + d + e 
+    else:
+        dateofeaster = 0    
+
+    return dateofeaster
+
+def convertDate(year):
+    date = easter(year)
+    
+    if date == 0:
+        print("Error: Date is out of range.")
+    elif date <= 30:
+        print("In", year, "Easter falls on March", date - 1, ".")
+    else:
+        print("In", year, "Easter falls on April", date - 31, ".")
+
+userYear = int(input("Enter a year between 1900 and 2099."))
+
+convertDate(userYear)
diff --git a/thinkcspy/Chapter-7-Exercises/Python-files/Problem4.py b/thinkcspy/Chapter-7-Exercises/Python-files/Problem4.py
new file mode 100644
index 0000000..7325cec
--- /dev/null
+++ b/thinkcspy/Chapter-7-Exercises/Python-files/Problem4.py
@@ -0,0 +1,64 @@
+# Runestone.Academy thinkcspy course
+# Chapter 7
+# Problem 4	
+
+import turtle
+
+def getColor(tf, tw, height):
+    if height >= 200:
+        tf.fillcolor("red")
+    elif height >= 100:
+        tf.fillcolor("yellow")
+    else:
+        tf.fillcolor("green")
+
+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")
+wn.tracer(100)
+
+tess = turtle.Turtle()           # create tess and set some attributes
+tess.color("black")
+tess.pensize(3)
+
+alex = turtle.Turtle()
+
+for a in xs:
+    getColor(tess, alex, a)
+    drawBar(tess, a)
+    writeData(alex, a)
+    
+
+wn.exitonclick()
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diff --git a/thinkcspy/Chapter-7-Exercises/Python-files/Problem5.py b/thinkcspy/Chapter-7-Exercises/Python-files/Problem5.py
new file mode 100644
index 0000000..e52e0bd
--- /dev/null
+++ b/thinkcspy/Chapter-7-Exercises/Python-files/Problem5.py
@@ -0,0 +1,70 @@
+# Runestone.Academy thinkcspy course
+# Chapter 7
+# Problem 5	
+
+import turtle
+
+def getColor(tf, tw, height):
+    if height >= 200:
+        tf.fillcolor("red")
+    elif height >= 100:
+        tf.fillcolor("yellow")
+    else:
+        tf.fillcolor("green")
+
+def writeData(tt, height):
+    if height < 0:
+        writeHeight = 0
+    else:
+        writeHeight = height
+  
+    tt.up()
+    tt.left(90)
+    tt.forward(writeHeight+10)
+    tt.right(90)
+    tt.forward(10)
+    tt.write(str(height))
+    tt.forward(30)
+    tt.right(90)
+    tt.forward(writeHeight+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
+minheight = min(xs)-10
+numbars = len(xs)
+border = 10
+
+wn = turtle.Screen()             # Set up the window and its attributes
+wn.setworldcoordinates(0-border, 0+minheight, 40*numbars+border, maxheight+border)
+wn.bgcolor("lightblue")
+wn.tracer(100)
+
+tess = turtle.Turtle()           # create tess and set some attributes
+tess.color("black")
+tess.pensize(3)
+
+alex = turtle.Turtle()
+
+for a in xs:
+    getColor(tess, alex, a)
+    drawBar(tess, a)
+    writeData(alex, a)
+    
+
+wn.exitonclick()
\ No newline at end of file