diff --git a/Week03/weighted_ali_badalov.py b/Week03/weighted_ali_badalov.py
new file mode 100644
index 0000000..c2e973d
--- /dev/null
+++ b/Week03/weighted_ali_badalov.py
@@ -0,0 +1,10 @@
+import random
+def weighted_srs(data, n, weights, with_replacement = False):
+    if len(data) != len(weights):
+        raise ValueError
+    if with_replacement:
+        return random.choices(data, weights=weights, k=n)
+    else:
+        if n > len(data):
+            raise ValueError
+        return random.sample(data, k=n)