added bytes conversion (#582)

* added bytes conversion, fixed some typos and mypy ignore for multidict

* added CHANGES file

* Update setup.cfg

Co-authored-by: Christian Leichsenring <christian.leichsenring@semalytix.com>
Co-authored-by: Andrew Svetlov <andrew.svetlov@gmail.com>

CHANGES/582.feature

@@ -0,0 +1 @@
+Add `__bytes__()` magic method so that `bytes(url)` will work and use optimal ASCII encoding.

tests/test_url.py

@@ -1021,6 +1021,14 @@ def test_from_non_ascii_path():
     ) == str(url)
 
 
+def test_bytes():
+    url = URL("http://example.com/путь/туда")
+    assert (
+        b"http://example.com/%D0%BF%D1%83%D1%82%D1%8C/%D1%82%D1%83%D0%B4%D0%B0"
+        == bytes(url)
+    )
+
+
 def test_from_ascii_query_parts():
     url = URL(
         "http://example.com/"

yarl/_url.py

@@ -272,6 +272,9 @@ def __str__(self):
     def __repr__(self):
         return "{}('{}')".format(self.__class__.__name__, str(self))
 
+    def __bytes__(self):
+        return str(self).encode("ascii")
+
     def __eq__(self, other):
         if not type(other) is URL:
             return NotImplemented