Create 04_recursive_max.py (#249)

Problem with max definition. If in input list last element is the biggest, the present algorithm is'n count it. I solved this problem by changing the return in the case if length == 1 from return 1 to first element of list.

04_quicksort/python/04_recursive_max.py

@@ -1,8 +1,8 @@
-def max_(lst):
-  if len(lst) == 0:
-    return None
-  if len(lst) == 1:
-    return lst[0]
-  else:
-    sub_max = max_(lst[1:])
-    return lst[0] if lst[0] > sub_max else sub_max
+def max(lst):
+    if len(lst) == 0:
+        return None
+    if len(lst) == 1:
+        return lst[0]
+    else:
+        max_num = max(lst[1:])
+        return lst[0] if lst[0] > max_num else max_num