raise an error when user tries to open a standard stream

Fixes #13718

IPython/core/interactiveshell.py

@@ -1239,6 +1239,15 @@ def prepare_user_module(self, user_module=None, user_ns=None):
         if user_ns is None:
             user_ns = user_module.__dict__
 
+        @functools.wraps(io_open)
+        def modified_open(file, *args, **kwargs):
+            if file in {0, 1, 2}:
+                raise ValueError(f"IPython won't let you open fd={file} by default")
+
+            return io_open(file, *args, **kwargs)
+
+        user_ns["open"] = modified_open
+
         return user_module, user_ns
 
     def init_sys_modules(self):

IPython/core/tests/test_interactiveshell.py

@@ -103,6 +103,21 @@ def test_syntax_error(self):
         res = ip.run_cell("raise = 3")
         self.assertIsInstance(res.error_before_exec, SyntaxError)
 
+    def test_open_standard_input_stream(self):
+        ip.init_create_namespaces()
+        res = ip.run_cell("open(0)")
+        self.assertIsInstance(res.error_in_exec, ValueError)
+
+    def test_open_standard_output_stream(self):
+        ip.init_create_namespaces()
+        res = ip.run_cell("open(1)")
+        self.assertIsInstance(res.error_in_exec, ValueError)
+
+    def test_open_standard_error_stream(self):
+        ip.init_create_namespaces()
+        res = ip.run_cell("open(2)")
+        self.assertIsInstance(res.error_in_exec, ValueError)
+
     def test_In_variable(self):
         "Verify that In variable grows with user input (GH-284)"
         oldlen = len(ip.user_ns['In'])