Fix typos and add Python files

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()