shell sort

sorting/shellSort.py

@@ -0,0 +1,28 @@
+
+# coding: utf-8
+
+# In[2]:
+
+
+alist = [54,26,93,17,77,31,44,55,20]
+def shellSort(alist):
+    sublistcount = len(alist)//2
+    while sublistcount > 0:
+        for startposition in range(sublistcount):
+            gapInsertionSort(alist,startposition,sublistcount)
+        sublistcount = sublistcount // 2
+    return alist
+
+def gapInsertionSort(alist,start,gap):
+    for i in range(start+gap,len(alist),gap):
+
+        currentvalue = alist[i]
+        position = i
+
+        while position>=gap and alist[position-gap]>currentvalue:
+            alist[position]=alist[position-gap]
+            position = position-gap
+
+        alist[position]=currentvalue
+print(shellSort(alist))
+