run_app: make print=None disable printing

CONTRIBUTORS.txt

@@ -29,6 +29,7 @@ Andrew Leech
 Andrew Lytvyn
 Andrew Svetlov
 Andrii Soldatenko
+Antoine Pietri
 Anton Kasyanov
 Arthur Darcet
 Ben Bader

aiohttp/web.py

@@ -422,6 +422,9 @@ def run_app(app, *, host=None, port=None, path=None, sock=None,
     app._set_loop(loop)
     loop.run_until_complete(app.startup())
 
+    if print is None:
+        print = lambda *_: None
+
     try:
         make_handler_kwargs = dict()
         if access_log_format is not None:

changes/2260.feature

@@ -0,0 +1 @@
+run_app: Make print=None disable printing

docs/web_reference.rst

@@ -2400,7 +2400,8 @@ Utilities
                        ``None`` for HTTP connection.
 
    :param print: a callable compatible with :func:`print`. May be used
-                 to override STDOUT output or suppress it.
+                 to override STDOUT output or suppress it. Passing `None`
+                 disables output.
 
    :param int backlog: the number of unaccepted connections that the
                        system will allow before refusing new