diff --git a/squares.py b/squares.py
index d7e454e..1620fd4 100644
--- a/squares.py
+++ b/squares.py
@@ -1,6 +1,11 @@
 """Computation of weighted average of squares."""
 
 
+import argparse
+import os
+
+
+
 def average_of_squares(list_of_numbers, list_of_weights=None):
     """ Return the weighted average of a list of values.
     
@@ -51,12 +56,25 @@ def convert_numbers(list_of_strings):
 
 
 if __name__ == "__main__":
-    numbers_strings = ["1","2","4"]
-    weight_strings = ["1","1","1"]        
+    parser = argparse.ArgumentParser(description="Inputs for weighted average of squares")
+    parser.add_argument("numbers_file", help="File containing numbers")
+    parser.add_argument("--weights", dest="weights_file", help="File containing weights", default=None)
+    arguments = parser.parse_args()
     
-    numbers = convert_numbers(numbers_strings)
-    weights = convert_numbers(weight_strings)
+    number = []
+    with open(arguments.numbers_file, "r") as numbers_file:
+        for line in numbers_file:
+            number.append(float(line.strip()))
+
+    if arguments.weights_file is not None:
+        weights = []
+        with open(arguments.weights_file, "r") as weights_file:
+            for line in weights_file:
+                weights.append(float(line.strip()))
+    
+    else:
+        weights = None
     
-    result = average_of_squares(numbers, weights)
+    result = average_of_squares(number, weights if weights else None)
     
     print(result)
\ No newline at end of file