general: ex1: add solution

general/ex1.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python
+
+import itertools
+from typing import Iterator
+
+
+def fibo() -> Iterator[int]:
+    a, b = 0, 1
+    while True:
+        yield a
+        a, b = b, a + b
+
+
+def main():
+    even_fibo_numbers = (x for x in fibo() if x % 2 == 0)
+    print(sum(itertools.islice(even_fibo_numbers, 100)))
+
+
+if __name__ == "__main__":
+    main()