update from O'Reilly repo

22-async/domains/README.rst

@@ -0,0 +1,28 @@
+domainlib demonstration
+=======================
+
+Run Python's async console (requires Python ≥ 3.8)::
+
+    $ python3 -m asyncio
+
+I'll see ``asyncio`` imported automatically::
+
+    >>> import asyncio
+
+Now you can experiment with ``domainlib``.
+
+At the `>>>` prompt, type these commands::
+
+    >>> from domainlib import *
+    >>> await probe('python.org')
+
+Note the result.
+
+Next::
+
+    >>> names = 'python.org rust-lang.org golang.org n05uch1an9.org'.split()
+    >>> async for result in multi_probe(names):
+    ...     print(*result, sep='\t')
+
+Note that if you run the last two lines again,
+the results are likely to appear in a different order.

22-async/domains/curio/blogdom.py

@@ -1,30 +1,28 @@
 #!/usr/bin/env python3
 from curio import run, TaskGroup
-from curio.socket import getaddrinfo, gaierror
+import curio.socket as socket
 from keyword import kwlist
 
-MAX_KEYWORD_LEN = 4  # <1>
+MAX_KEYWORD_LEN = 4
 
 
-async def probe(domain: str) -> tuple[str, bool]:  # <2>
+async def probe(domain: str) -> tuple[str, bool]:  # <1>
     try:
-        await getaddrinfo(domain, None)  # <4>
-    except gaierror:
+        await socket.getaddrinfo(domain, None)  # <2>
+    except socket.gaierror:
         return (domain, False)
     return (domain, True)
 
-
-async def main() -> None:  # <5>
-    names = (kw for kw in kwlist if len(kw) <= MAX_KEYWORD_LEN)  # <6>
-    domains = (f'{name}.dev'.lower() for name in names)  # <7>
-    async with TaskGroup() as group:
+async def main() -> None:
+    names = (kw for kw in kwlist if len(kw) <= MAX_KEYWORD_LEN)
+    domains = (f'{name}.dev'.lower() for name in names)
+    async with TaskGroup() as group:  # <3>
         for domain in domains:
-            await group.spawn(probe, domain)
-        async for task in group:  # <9>
-            domain, found = task.result  # <10>
+            await group.spawn(probe, domain)  # <4>
+        async for task in group:  # <5>
+            domain, found = task.result
             mark = '+' if found else ' '
             print(f'{mark} {domain}')
 
-
 if __name__ == '__main__':
-    run(main())  # <11>
+    run(main())  # <6>

22-async/domains/curio/domainlib.py

@@ -1,5 +1,5 @@
 from curio import TaskGroup
-from curio.socket import getaddrinfo, gaierror
+import curio.socket as socket
 from collections.abc import Iterable, AsyncIterator
 from typing import NamedTuple
 
@@ -9,10 +9,10 @@ class Result(NamedTuple):
     found: bool
 
 
-async def probe(domain: str) -> Result:
+ async def probe(domain: str) -> Result:
     try:
-        await getaddrinfo(domain, None)
-    except gaierror:
+        await socket.getaddrinfo(domain, None)
+    except socket.gaierror:
         return Result(domain, False)
     return Result(domain, True)