added new fn for async progrm

Author: Kinetics20

intro/magic_1_s_a_.py

@@ -0,0 +1,26 @@
+import requests
+import threading
+from concurrent.futures import Future
+
+class FetchFuture(Future):
+    def __init__(self, url):
+        super().__init__()
+        thread = threading.Thread(target=self._fetch, args=(url,))
+        thread.start()
+
+    def _fetch(self, url):
+        response = requests.get(url)
+        self.set_result(response.json())
+
+
+def gen(url):
+    data = yield FetchFuture(url)
+    print(data)
+    yield
+
+
+url = "https://api.nbp.pl/api/exchangerates/rates/a/eur"
+g = gen(url)
+future = next(g)
+
+future.add_done_callback(lambda f: g.send(f.result()))