gh-118893: Evaluate all statements in the new REPL separately

Lib/_pyrepl/simple_interact.py

@@ -30,6 +30,7 @@
 import linecache
 import sys
 import code
+import ast
 from types import ModuleType
 
 from .readline import _get_reader, multiline_input
@@ -77,6 +78,26 @@ def __init__(
     def showtraceback(self):
         super().showtraceback(colorize=self.can_colorize)
 
+    def runsource(self, source, filename="<input>", symbol="single"):
+        tree = ast.parse(source)
+        if tree.body:
+            *_, last_stmt = tree.body
+        for stmt in tree.body:
+            wrapper = ast.Interactive if stmt is last_stmt else ast.Module
+            the_symbol = symbol if stmt is last_stmt else "exec"
+            item = wrapper([stmt])
+            try:
+                code = compile(item, filename, the_symbol)
+            except (OverflowError, ValueError):
+                    self.showsyntaxerror(filename)
+                    return False
+
+            if code is None:
+                return True
+
+            self.runcode(code)
+        return False
+
 
 def run_multiline_interactive_console(
     mainmodule: ModuleType | None= None, future_flags: int = 0
@@ -144,10 +165,7 @@ def more_lines(unicodetext: str) -> bool:
 
             input_name = f"<python-input-{input_n}>"
             linecache._register_code(input_name, statement, "<stdin>")  # type: ignore[attr-defined]
-            symbol = "single" if not contains_pasted_code else "exec"
-            more = console.push(_strip_final_indent(statement), filename=input_name, _symbol=symbol)  # type: ignore[call-arg]
-            if contains_pasted_code and more:
-                more = console.push(_strip_final_indent(statement), filename=input_name, _symbol="single")  # type: ignore[call-arg]
+            more = console.push(_strip_final_indent(statement), filename=input_name, _symbol="single")  # type: ignore[call-arg]
             assert not more
             input_n += 1
         except KeyboardInterrupt:

Lib/test/test_pyrepl.py

@@ -1,13 +1,15 @@
 import itertools
 import os
 import rlcompleter
-import sys
 import tempfile
 import unittest
 from code import InteractiveConsole
 from functools import partial
 from unittest import TestCase
 from unittest.mock import MagicMock, patch
+from textwrap import dedent
+import contextlib
+import io
 
 from test.support import requires
 from test.support.import_helper import import_module
@@ -1002,5 +1004,62 @@ def test_up_arrow_after_ctrl_r(self):
         self.assert_screen_equals(reader, "")
 
 
+class TestSimpleInteract(unittest.TestCase):
+    def test_multiple_statements(self):
+        namespace = {}
+        code = dedent("""\
+        class A:
+            def foo(self):
+
+
+                pass
+
+        class B:
+            def bar(self):
+                pass
+
+        a = 1
+        a
+        """)
+        console = InteractiveColoredConsole(namespace, filename="<stdin>")
+        with (
+            patch.object(InteractiveColoredConsole, "showsyntaxerror") as showsyntaxerror,
+            patch.object(InteractiveColoredConsole, "runsource", wraps=console.runsource) as runsource,
+        ):
+            more = console.push(code, filename="<stdin>", _symbol="single")  # type: ignore[call-arg]
+        self.assertFalse(more)
+        showsyntaxerror.assert_not_called()
+
+
+    def test_multiple_statements_output(self):
+        namespace = {}
+        code = dedent("""\
+        b = 1
+        b
+        a = 1
+        a
+        """)
+        console = InteractiveColoredConsole(namespace, filename="<stdin>")
+        f = io.StringIO()
+        with contextlib.redirect_stdout(f):
+            more = console.push(code, filename="<stdin>", _symbol="single")  # type: ignore[call-arg]
+        self.assertFalse(more)
+        self.assertEqual(f.getvalue(), "1\n")
+
+    def test_empty(self):
+        namespace = {}
+        code = ""
+        console = InteractiveColoredConsole(namespace, filename="<stdin>")
+        f = io.StringIO()
+        with contextlib.redirect_stdout(f):
+            more = console.push(code, filename="<stdin>", _symbol="single")  # type: ignore[call-arg]
+        self.assertFalse(more)
+        self.assertEqual(f.getvalue(), "")
+
+
+if __name__ == '__main__':
+    unittest.main()
+
+
 if __name__ == '__main__':
     unittest.main()