pythongh-82378: fix sys.tracebacklimit in pyrepl

make sure that pyrepl uses the same logic for sys.tracebacklimit as both
the basic repl and the standard sys.excepthook

Author: cfbolz

Lib/_pyrepl/console.py

@@ -162,10 +162,12 @@ def __init__(
         self.can_colorize = _colorize.can_colorize()
 
     def showsyntaxerror(self, filename=None):
-        super().showsyntaxerror(colorize=self.can_colorize)
+        import traceback
+        super().showsyntaxerror(colorize=self.can_colorize, limit=traceback.BUILTIN_EXCEPTION_LIMIT)
 
     def showtraceback(self):
-        super().showtraceback(colorize=self.can_colorize)
+        import traceback
+        super().showtraceback(colorize=self.can_colorize, limit=traceback.BUILTIN_EXCEPTION_LIMIT)
 
     def runsource(self, source, filename="<input>", symbol="single"):
         try:

Lib/code.py

@@ -107,6 +107,7 @@ def showsyntaxerror(self, filename=None, **kwargs):
 
         """
         colorize = kwargs.pop('colorize', False)
+        limit = kwargs.pop('limit', None)
         type, value, tb = sys.exc_info()
         sys.last_exc = value
         sys.last_type = type
@@ -124,7 +125,8 @@ def showsyntaxerror(self, filename=None, **kwargs):
                 value = SyntaxError(msg, (filename, lineno, offset, line))
                 sys.last_exc = sys.last_value = value
         if sys.excepthook is sys.__excepthook__:
-            lines = traceback.format_exception_only(type, value, colorize=colorize)
+            lines = traceback.format_exception_only(type, value, colorize=colorize,
+                                                    limit=limit)
             self.write(''.join(lines))
         else:
             # If someone has set sys.excepthook, we let that take precedence
@@ -140,11 +142,13 @@ def showtraceback(self, **kwargs):
 
         """
         colorize = kwargs.pop('colorize', False)
+        limit = kwargs.pop('limit', None)
         sys.last_type, sys.last_value, last_tb = ei = sys.exc_info()
         sys.last_traceback = last_tb
         sys.last_exc = ei[1]
         try:
-            lines = traceback.format_exception(ei[0], ei[1], last_tb.tb_next, colorize=colorize)
+            lines = traceback.format_exception(ei[0], ei[1], last_tb.tb_next, colorize=colorize,
+                                               limit=limit)
             if sys.excepthook is sys.__excepthook__:
                 self.write(''.join(lines))
             else:

Lib/test/test_pyrepl/test_pyrepl.py

@@ -1076,6 +1076,31 @@ def test_not_wiping_history_file(self):
         self.assertIn("spam", output)
         self.assertNotEqual(pathlib.Path(hfile.name).stat().st_size, 0)
 
+    @force_not_colorized
+    def test_proper_tracebacklimit(self):
+        env = os.environ.copy()
+        commands = ("import sys\n"
+                    "sys.tracebacklimit = 1\n"
+                    "def x1(): 1/0\n\n"
+                    "def x2(): x1()\n\n"
+                    "def x3(): x2()\n\n"
+                    "x3()\n"
+                    "exit()\n")
+
+        env.pop("PYTHON_BASIC_REPL", None)
+        output, exit_code = self.run_repl(commands, env=env)
+        if "can\'t use pyrepl" in output:
+            self.skipTest("pyrepl not available")
+        self.assertIn("in x1", output)
+        self.assertNotIn("in x3", output)
+        self.assertNotIn("in <module>", output)
+
+        env["PYTHON_BASIC_REPL"] = "1"
+        output, exit_code = self.run_repl(commands, env=env)
+        self.assertIn("in x1", output)
+        self.assertNotIn("in x3", output)
+        self.assertNotIn("in <module>", output)
+
     def run_repl(
         self,
         repl_input: str | list[str],