prompt: 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()
  
  ```
  
golden_diff: 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()
  
verification_info: {"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"}]}