We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Interactive mode (REPL)  (v 1.8.0a1) Error
**from playwright.sync_api import sync_playwright
playwright = sync_playwright().start()**

Traceback (most recent call last):
  File "C:\Python37\lib\site-packages\playwright\_impl\_transport.py", line 27, in _get_stderr_fileno
    return sys.stderr.fileno()
io.UnsupportedOperation: fileno

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    playwright = sync_playwright().start()
  File "C:\Python37\lib\site-packages\playwright\sync_api\_context_manager.py", line 73, in start
    return self.__enter__()
  File "C:\Python37\lib\site-packages\playwright\sync_api\_context_manager.py", line 67, in __enter__
    dispatcher_fiber.switch()
  File "C:\Python37\lib\site-packages\playwright\sync_api\_context_manager.py", line 48, in greenlet_main
    loop.run_until_complete(self._connection.run_as_sync())
  File "C:\Python37\lib\asyncio\base_events.py", line 587, in run_until_complete
    return future.result()
  File "C:\Python37\lib\site-packages\playwright\_impl\_connection.py", line 134, in run_as_sync
    await self.run()
  File "C:\Python37\lib\site-packages\playwright\_impl\_connection.py", line 139, in run
    await self._transport.run()
  File "C:\Python37\lib\site-packages\playwright\_impl\_transport.py", line 62, in run
    stderr=_get_stderr_fileno(),
  File "C:\Python37\lib\site-packages\playwright\_impl\_transport.py", line 34, in _get_stderr_fileno
    return sys.__stderr__.fileno()
AttributeError: 'NoneType' object has no attribute 'fileno'

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `playwright/_impl/_transport.py`
Content:
```
1 # Copyright (c) Microsoft Corporation.
2 #
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
6 #
7 # http://www.apache.org/licenses/LICENSE-2.0
8 #
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
14 
15 import asyncio
16 import io
17 import json
18 import os
19 import sys
20 from pathlib import Path
21 from typing import Dict, Optional
22 
23 
24 # Sourced from: https://github.com/pytest-dev/pytest/blob/da01ee0a4bb0af780167ecd228ab3ad249511302/src/_pytest/faulthandler.py#L69-L77
25 def _get_stderr_fileno() -> Optional[int]:
26     try:
27         return sys.stderr.fileno()
28     except (AttributeError, io.UnsupportedOperation):
29         # pytest-xdist monkeypatches sys.stderr with an object that is not an actual file.
30         # https://docs.python.org/3/library/faulthandler.html#issue-with-file-descriptors
31         # This is potentially dangerous, but the best we can do.
32         if not hasattr(sys, "__stderr__"):
33             return None
34         return sys.__stderr__.fileno()
35 
36 
37 class Transport:
38     def __init__(self, driver_executable: Path) -> None:
39         super().__init__()
40         self.on_message = lambda _: None
41         self._stopped = False
42         self._driver_executable = driver_executable
43         self._loop: asyncio.AbstractEventLoop
44 
45     def stop(self) -> None:
46         self._stopped = True
47         self._output.close()
48 
49     async def run(self) -> None:
50         self._loop = asyncio.get_running_loop()
51 
52         driver_env = os.environ.copy()
53         # VSCode's JavaScript Debug Terminal provides it but driver/pkg does not support it
54         driver_env.pop("NODE_OPTIONS", None)
55 
56         proc = await asyncio.create_subprocess_exec(
57             str(self._driver_executable),
58             "run-driver",
59             env=driver_env,
60             stdin=asyncio.subprocess.PIPE,
61             stdout=asyncio.subprocess.PIPE,
62             stderr=_get_stderr_fileno(),
63             limit=32768,
64         )
65         assert proc.stdout
66         assert proc.stdin
67         self._output = proc.stdin
68 
69         while not self._stopped:
70             try:
71                 buffer = await proc.stdout.readexactly(4)
72                 length = int.from_bytes(buffer, byteorder="little", signed=False)
73                 buffer = bytes(0)
74                 while length:
75                     to_read = min(length, 32768)
76                     data = await proc.stdout.readexactly(to_read)
77                     length -= to_read
78                     if len(buffer):
79                         buffer = buffer + data
80                     else:
81                         buffer = data
82                 obj = json.loads(buffer)
83 
84                 if "DEBUGP" in os.environ:  # pragma: no cover
85                     print("\x1b[33mRECV>\x1b[0m", json.dumps(obj, indent=2))
86                 self.on_message(obj)
87             except asyncio.IncompleteReadError:
88                 break
89             await asyncio.sleep(0)
90 
91     def send(self, message: Dict) -> None:
92         msg = json.dumps(message)
93         if "DEBUGP" in os.environ:  # pragma: no cover
94             print("\x1b[32mSEND>\x1b[0m", json.dumps(message, indent=2))
95         data = msg.encode()
96         self._output.write(
97             len(data).to_bytes(4, byteorder="little", signed=False) + data
98         )
99
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/playwright/_impl/_transport.py b/playwright/_impl/_transport.py
--- a/playwright/_impl/_transport.py
+++ b/playwright/_impl/_transport.py
@@ -29,7 +29,7 @@
         # pytest-xdist monkeypatches sys.stderr with an object that is not an actual file.
         # https://docs.python.org/3/library/faulthandler.html#issue-with-file-descriptors
         # This is potentially dangerous, but the best we can do.
-        if not hasattr(sys, "__stderr__"):
+        if not hasattr(sys, "__stderr__") or not sys.__stderr__:
             return None
         return sys.__stderr__.fileno()

{"golden_diff": "diff --git a/playwright/_impl/_transport.py b/playwright/_impl/_transport.py\n--- a/playwright/_impl/_transport.py\n+++ b/playwright/_impl/_transport.py\n@@ -29,7 +29,7 @@\n         # pytest-xdist monkeypatches sys.stderr with an object that is not an actual file.\n         # https://docs.python.org/3/library/faulthandler.html#issue-with-file-descriptors\n         # This is potentially dangerous, but the best we can do.\n-        if not hasattr(sys, \"__stderr__\"):\n+        if not hasattr(sys, \"__stderr__\") or not sys.__stderr__:\n             return None\n         return sys.__stderr__.fileno()\n", "issue": "Interactive mode (REPL)  (v 1.8.0a1) Error\n**from playwright.sync_api import sync_playwright\r\nplaywright = sync_playwright().start()**\r\n\r\nTraceback (most recent call last):\r\n  File \"C:\\Python37\\lib\\site-packages\\playwright\\_impl\\_transport.py\", line 27, in _get_stderr_fileno\r\n    return sys.stderr.fileno()\r\nio.UnsupportedOperation: fileno\r\n\r\nDuring handling of the above exception, another exception occurred:\r\n\r\nTraceback (most recent call last):\r\n  File \"<pyshell#1>\", line 1, in <module>\r\n    playwright = sync_playwright().start()\r\n  File \"C:\\Python37\\lib\\site-packages\\playwright\\sync_api\\_context_manager.py\", line 73, in start\r\n    return self.__enter__()\r\n  File \"C:\\Python37\\lib\\site-packages\\playwright\\sync_api\\_context_manager.py\", line 67, in __enter__\r\n    dispatcher_fiber.switch()\r\n  File \"C:\\Python37\\lib\\site-packages\\playwright\\sync_api\\_context_manager.py\", line 48, in greenlet_main\r\n    loop.run_until_complete(self._connection.run_as_sync())\r\n  File \"C:\\Python37\\lib\\asyncio\\base_events.py\", line 587, in run_until_complete\r\n    return future.result()\r\n  File \"C:\\Python37\\lib\\site-packages\\playwright\\_impl\\_connection.py\", line 134, in run_as_sync\r\n    await self.run()\r\n  File \"C:\\Python37\\lib\\site-packages\\playwright\\_impl\\_connection.py\", line 139, in run\r\n    await self._transport.run()\r\n  File \"C:\\Python37\\lib\\site-packages\\playwright\\_impl\\_transport.py\", line 62, in run\r\n    stderr=_get_stderr_fileno(),\r\n  File \"C:\\Python37\\lib\\site-packages\\playwright\\_impl\\_transport.py\", line 34, in _get_stderr_fileno\r\n    return sys.__stderr__.fileno()\r\nAttributeError: 'NoneType' object has no attribute 'fileno'\n", "before_files": [{"content": "# Copyright (c) Microsoft Corporation.\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n# http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nimport asyncio\nimport io\nimport json\nimport os\nimport sys\nfrom pathlib import Path\nfrom typing import Dict, Optional\n\n\n# Sourced from: https://github.com/pytest-dev/pytest/blob/da01ee0a4bb0af780167ecd228ab3ad249511302/src/_pytest/faulthandler.py#L69-L77\ndef _get_stderr_fileno() -> Optional[int]:\n    try:\n        return sys.stderr.fileno()\n    except (AttributeError, io.UnsupportedOperation):\n        # pytest-xdist monkeypatches sys.stderr with an object that is not an actual file.\n        # https://docs.python.org/3/library/faulthandler.html#issue-with-file-descriptors\n        # This is potentially dangerous, but the best we can do.\n        if not hasattr(sys, \"__stderr__\"):\n            return None\n        return sys.__stderr__.fileno()\n\n\nclass Transport:\n    def __init__(self, driver_executable: Path) -> None:\n        super().__init__()\n        self.on_message = lambda _: None\n        self._stopped = False\n        self._driver_executable = driver_executable\n        self._loop: asyncio.AbstractEventLoop\n\n    def stop(self) -> None:\n        self._stopped = True\n        self._output.close()\n\n    async def run(self) -> None:\n        self._loop = asyncio.get_running_loop()\n\n        driver_env = os.environ.copy()\n        # VSCode's JavaScript Debug Terminal provides it but driver/pkg does not support it\n        driver_env.pop(\"NODE_OPTIONS\", None)\n\n        proc = await asyncio.create_subprocess_exec(\n            str(self._driver_executable),\n            \"run-driver\",\n            env=driver_env,\n            stdin=asyncio.subprocess.PIPE,\n            stdout=asyncio.subprocess.PIPE,\n            stderr=_get_stderr_fileno(),\n            limit=32768,\n        )\n        assert proc.stdout\n        assert proc.stdin\n        self._output = proc.stdin\n\n        while not self._stopped:\n            try:\n                buffer = await proc.stdout.readexactly(4)\n                length = int.from_bytes(buffer, byteorder=\"little\", signed=False)\n                buffer = bytes(0)\n                while length:\n                    to_read = min(length, 32768)\n                    data = await proc.stdout.readexactly(to_read)\n                    length -= to_read\n                    if len(buffer):\n                        buffer = buffer + data\n                    else:\n                        buffer = data\n                obj = json.loads(buffer)\n\n                if \"DEBUGP\" in os.environ:  # pragma: no cover\n                    print(\"\\x1b[33mRECV>\\x1b[0m\", json.dumps(obj, indent=2))\n                self.on_message(obj)\n            except asyncio.IncompleteReadError:\n                break\n            await asyncio.sleep(0)\n\n    def send(self, message: Dict) -> None:\n        msg = json.dumps(message)\n        if \"DEBUGP\" in os.environ:  # pragma: no cover\n            print(\"\\x1b[32mSEND>\\x1b[0m\", json.dumps(message, indent=2))\n        data = msg.encode()\n        self._output.write(\n            len(data).to_bytes(4, byteorder=\"little\", signed=False) + data\n        )\n", "path": "playwright/_impl/_transport.py"}], "after_files": [{"content": "# Copyright (c) Microsoft Corporation.\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n# http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nimport asyncio\nimport io\nimport json\nimport os\nimport sys\nfrom pathlib import Path\nfrom typing import Dict, Optional\n\n\n# Sourced from: https://github.com/pytest-dev/pytest/blob/da01ee0a4bb0af780167ecd228ab3ad249511302/src/_pytest/faulthandler.py#L69-L77\ndef _get_stderr_fileno() -> Optional[int]:\n    try:\n        return sys.stderr.fileno()\n    except (AttributeError, io.UnsupportedOperation):\n        # pytest-xdist monkeypatches sys.stderr with an object that is not an actual file.\n        # https://docs.python.org/3/library/faulthandler.html#issue-with-file-descriptors\n        # This is potentially dangerous, but the best we can do.\n        if not hasattr(sys, \"__stderr__\") or not sys.__stderr__:\n            return None\n        return sys.__stderr__.fileno()\n\n\nclass Transport:\n    def __init__(self, driver_executable: Path) -> None:\n        super().__init__()\n        self.on_message = lambda _: None\n        self._stopped = False\n        self._driver_executable = driver_executable\n        self._loop: asyncio.AbstractEventLoop\n\n    def stop(self) -> None:\n        self._stopped = True\n        self._output.close()\n\n    async def run(self) -> None:\n        self._loop = asyncio.get_running_loop()\n\n        driver_env = os.environ.copy()\n        # VSCode's JavaScript Debug Terminal provides it but driver/pkg does not support it\n        driver_env.pop(\"NODE_OPTIONS\", None)\n\n        proc = await asyncio.create_subprocess_exec(\n            str(self._driver_executable),\n            \"run-driver\",\n            env=driver_env,\n            stdin=asyncio.subprocess.PIPE,\n            stdout=asyncio.subprocess.PIPE,\n            stderr=_get_stderr_fileno(),\n            limit=32768,\n        )\n        assert proc.stdout\n        assert proc.stdin\n        self._output = proc.stdin\n\n        while not self._stopped:\n            try:\n                buffer = await proc.stdout.readexactly(4)\n                length = int.from_bytes(buffer, byteorder=\"little\", signed=False)\n                buffer = bytes(0)\n                while length:\n                    to_read = min(length, 32768)\n                    data = await proc.stdout.readexactly(to_read)\n                    length -= to_read\n                    if len(buffer):\n                        buffer = buffer + data\n                    else:\n                        buffer = data\n                obj = json.loads(buffer)\n\n                if \"DEBUGP\" in os.environ:  # pragma: no cover\n                    print(\"\\x1b[33mRECV>\\x1b[0m\", json.dumps(obj, indent=2))\n                self.on_message(obj)\n            except asyncio.IncompleteReadError:\n                break\n            await asyncio.sleep(0)\n\n    def send(self, message: Dict) -> None:\n        msg = json.dumps(message)\n        if \"DEBUGP\" in os.environ:  # pragma: no cover\n            print(\"\\x1b[32mSEND>\\x1b[0m\", json.dumps(message, indent=2))\n        data = msg.encode()\n        self._output.write(\n            len(data).to_bytes(4, byteorder=\"little\", signed=False) + data\n        )\n", "path": "playwright/_impl/_transport.py"}]}