bpo-32258: Replace 'yield from' to 'await' in asyncio docs (#4779)

* Replace 'yield from' to 'await' in asyncio docs

* Fix docstrings

1 files changed, 11 insertions, 12 deletions

diff --git a/Doc/library/asyncio-subprocess.rst b/Doc/library/asyncio-subprocess.rst
index 1c1d0be..280b764 100644
--- a/Doc/library/asyncio-subprocess.rst
+++ b/Doc/library/asyncio-subprocess.rst
@@ -347,21 +347,20 @@ wait for the subprocess exit. The subprocess is created by the
         def process_exited(self):
             self.exit_future.set_result(True)
 
-    @asyncio.coroutine
-    def get_date(loop):
+    async def get_date(loop):
         code = 'import datetime; print(datetime.datetime.now())'
         exit_future = asyncio.Future(loop=loop)
 
         # Create the subprocess controlled by the protocol DateProtocol,
         # redirect the standard output into a pipe
-        create = loop.subprocess_exec(lambda: DateProtocol(exit_future),
-                                      sys.executable, '-c', code,
-                                      stdin=None, stderr=None)
-        transport, protocol = yield from create
+        transport, protocol = await loop.subprocess_exec(
+            lambda: DateProtocol(exit_future),
+            sys.executable, '-c', code,
+            stdin=None, stderr=None)
 
         # Wait for the subprocess exit using the process_exited() method
         # of the protocol
-        yield from exit_future
+        await exit_future
 
         # Close the stdout pipe
         transport.close()
@@ -398,16 +397,16 @@ function::
         code = 'import datetime; print(datetime.datetime.now())'
 
         # Create the subprocess, redirect the standard output into a pipe
-        create = asyncio.create_subprocess_exec(sys.executable, '-c', code,
-                                                stdout=asyncio.subprocess.PIPE)
-        proc = yield from create
+        proc = await asyncio.create_subprocess_exec(
+            sys.executable, '-c', code,
+            stdout=asyncio.subprocess.PIPE)
 
         # Read one line of output
-        data = yield from proc.stdout.readline()
+        data = await proc.stdout.readline()
         line = data.decode('ascii').rstrip()
 
         # Wait for the subprocess exit
-        yield from proc.wait()
+        await proc.wait()
         return line
 
     if sys.platform == "win32":