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bpo-32604: Add support for a "default" arg in channel_recv(). (GH-19770)

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This allows the caller to avoid creation of an exception when the channel is empty (just like `dict.get()` works).  `ChannelEmptyError` is still raised if no default is provided.

Automerge-Triggered-By: @ericsnowcurrently
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Eric Snow 2020-04-28 17:11:32 -06:00 • committed by GitHub
parent 6d86a2331e
commit 5e8c691594
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2 changed files with 46 additions and 11 deletions
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21
Lib/test/test__xxsubinterpreters.py
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@ -1302,6 +1302,27 @@ class ChannelTests(TestBase):
with self.assertRaises(interpreters.ChannelEmptyError):
interpreters.channel_recv(cid)
def test_recv_default(self):
default = object()
cid = interpreters.channel_create()
obj1 = interpreters.channel_recv(cid, default)
interpreters.channel_send(cid, None)
interpreters.channel_send(cid, 1)
interpreters.channel_send(cid, b'spam')
interpreters.channel_send(cid, b'eggs')
obj2 = interpreters.channel_recv(cid, default)
obj3 = interpreters.channel_recv(cid, default)
obj4 = interpreters.channel_recv(cid)
obj5 = interpreters.channel_recv(cid, default)
obj6 = interpreters.channel_recv(cid, default)
self.assertIs(obj1, default)
self.assertIs(obj2, None)
self.assertEqual(obj3, 1)
self.assertEqual(obj4, b'spam')
self.assertEqual(obj5, b'eggs')
self.assertIs(obj6, default)
def test_run_string_arg_unresolved(self):
cid = interpreters.channel_create()
interp = interpreters.create()