Added doctests to OddEvenTraposition (TheAlgorithms#2152)

* Added doctests

* Change __main__ content

Author: l3str4nge

sorts/odd_even_transposition_single_threaded.py

@@ -7,29 +7,24 @@
 
 
 def OddEvenTransposition(arr):
+    """
+    >>> OddEvenTransposition([5, 4, 3, 2, 1])
+    [1, 2, 3, 4, 5]
+
+    >>> OddEvenTransposition([13, 11, 18, 0, -1])
+    [-1, 0, 11, 13, 18]
+
+    >>> OddEvenTransposition([-.1, 1.1, .1, -2.9])
+    [-2.9, -0.1, 0.1, 1.1]
+    """
     for i in range(0, len(arr)):
         for i in range(i % 2, len(arr) - 1, 2):
             if arr[i + 1] < arr[i]:
                 arr[i], arr[i + 1] = arr[i + 1], arr[i]
-        print(*arr)
 
     return arr
 
 
-# creates a list and sorts it
-def main():
-    list = []
-
-    for i in range(10, 0, -1):
-        list.append(i)
-    print("Initial List")
-    print(*list)
-
-    list = OddEvenTransposition(list)
-
-    print("Sorted List\n")
-    print(*list)
-
-
 if __name__ == "__main__":
-    main()
+    arr = list(range(10, 0, -1))
+    print(f"Original: {arr}. Sorted: {OddEvenTransposition(arr)}")