Add Chapter 9 exercises

thinkcspy/Chapter-9-Exercises/Python-files/Problem10.py

@@ -0,0 +1,29 @@
+# Runestone.Academy thinkcspy course
+# Chapter 9
+# Problem 10
+
+def count(substr,theStr):
+    # your code here
+    count = 0
+    charCount = 0
+    pos1 = 0
+    pos2 = len(substr)
+    charPos = len(substr)
+    
+    while charCount < len(theStr):
+        if charPos == 1 and substr == theStr[pos1] and (pos2 == len(theStr) or substr != theStr[pos2]):
+            count += 1
+            charCount += 1
+        elif  substr == theStr[pos1:pos2]:
+            count += 1
+            charCount += charPos + 1
+        else:
+            charCount += 1
+            
+
+        pos1 += 1
+        pos2 += 1
+                
+    return count
+
+print(count("e", "treeleee"))