Resolving error

Author: Kushagra9399

pydatastructs/linear_data_structures/algorithms.py

@@ -1906,9 +1906,7 @@ def radix_sort(array, comp=lambda u, v: u <= v, **kwargs):
     start = kwargs.get('start', 0)
     end = kwargs.get('end', len(array) - 1)
 
-    sub_array = []
-    for i in range(start, end + 1):
-        sub_array.append(array[i])
+    sub_array = [array[i] for i in range(start, end + 1) if array[i] is not None]
 
     # Remove None values from sub_array before sorting
     sub_array = [x for x in sub_array if x is not None]