python: ex1: add solution

python/ex1.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python
+
+from typing import Iterator
+
+
+def multiples_of(n: int, max: int) -> Iterator[int]:
+    assert n > 0, f"n must be striclyt positive, got: {n}"
+    i = 0
+    while i < max:
+        yield i
+        i += n
+
+
+def main():
+    print(sum(multiples_of(3, 102030)))
+
+
+if __name__ == "__main__":
+    main()