gh-140013: Add multi-line support to asyncio REPL in basic mode

Lib/asyncio/__main__.py

@@ -11,6 +11,7 @@
 import threading
 import types
 import warnings
+from code import InteractiveConsole
 
 from _colorize import get_theme
 from _pyrepl.console import InteractiveColoredConsole
@@ -27,6 +28,11 @@ def __init__(self, locals, loop):
         self.loop = loop
         self.context = contextvars.copy_context()
 
+    def runsource(self, source, filename="<input>", symbol="single"):
+        if CAN_USE_PYREPL:
+            return super().runsource(source, filename, symbol)
+        return InteractiveConsole.runsource(self, source, filename, symbol)
+
     def runcode(self, code):
         global return_code
         future = concurrent.futures.Future()

Lib/test/test_repl.py

@@ -357,6 +357,18 @@ def f():
 
 
 class TestAsyncioREPL(unittest.TestCase):
+    def test_multiline_support(self):
+        user_input = dedent("""\
+        async def spam():
+            print("eggs" + "ham")
+
+        await spam()
+        """)
+        p = spawn_repl("-m", "asyncio")
+        p.stdin.write(user_input)
+        output = kill_python(p)
+        self.assertIn("eggsham", output)
+
     def test_multiple_statements_fail_early(self):
         user_input = "1 / 0; print(f'afterwards: {1+1}')"
         p = spawn_repl("-m", "asyncio")
@@ -389,7 +401,7 @@ def test_toplevel_contextvars_async(self):
         """)
         p = spawn_repl("-m", "asyncio")
         p.stdin.write(user_input)
-        user_input2 = "async def set_var(): var.set('ok')\n"
+        user_input2 = "async def set_var(): var.set('ok')\n\n"
         p.stdin.write(user_input2)
         user_input3 = "await set_var()\n"
         p.stdin.write(user_input3)

Misc/NEWS.d/next/Library/2025-10-13-01-59-57.gh-issue-140013.CJc3vA.rst

@@ -0,0 +1,2 @@
+The :mod:`asyncio` REPL in basic mode now supports multi-line inputs. Contributed
+by Bartosz Sławecki.