prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  plain_str not consistent between Py2 and Py3
  **Python 2 (expected result)**
  ```python
  >>> plain_str(b'\x3e\xb4\xef\x2c\x11')
  '>\xb4\xef,\x11'
  ```
  
  **Python 3 (unexpected result)**
  ```python
  >>> plain_str(b'\x3e\xb4\xef\x2c\x11')                                                                                                                                             
  '>,\x11'
  ```
  
  **Cause** is `errors="ignore"`
  ```python
  def plain_str(x):                          
      """Convert basic byte objects to str"""
      if isinstance(x, bytes):               
          return x.decode(errors="ignore")   
      return str(x)       
  ```
  
  It just ignores values that are not in a valid range for the codec.
  
  **Possible fix**
  ```python
  def plain_str(x):                          
      """Convert basic byte objects to str"""
      if isinstance(x, bytes):               
          return x.decode(errors="backslashreplace")   
      return str(x)       
  ```        
  But this breaks compatibility for Python 3.4
  
  
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `scapy/compat.py`
  Content:
  ```
  1 # This file is part of Scapy
  2 # See http://www.secdev.org/projects/scapy for more information
  3 # Copyright (C) Philippe Biondi <phil@secdev.org>
  4 # Copyright (C) Gabriel Potter <gabriel@potter.fr>
  5 # This program is published under a GPLv2 license
  6 
  7 """
  8 Python 2 and 3 link classes.
  9 """
  10 
  11 from __future__ import absolute_import
  12 import base64
  13 import binascii
  14 import gzip
  15 import struct
  16 
  17 import scapy.modules.six as six
  18 
  19 ###########
  20 # Python3 #
  21 ###########
  22 
  23 
  24 def lambda_tuple_converter(func):
  25     """
  26     Converts a Python 2 function as
  27       lambda (x,y): x + y
  28     In the Python 3 format:
  29       lambda x,y : x + y
  30     """
  31     if func is not None and func.__code__.co_argcount == 1:
  32         return lambda *args: func(args[0] if len(args) == 1 else args)
  33     else:
  34         return func
  35 
  36 
  37 if six.PY2:
  38     bytes_encode = plain_str = str
  39     chb = lambda x: x if isinstance(x, str) else chr(x)
  40     orb = ord
  41 
  42     def raw(x):
  43         """Builds a packet and returns its bytes representation.
  44         This function is and always be cross-version compatible"""
  45         if hasattr(x, "__bytes__"):
  46             return x.__bytes__()
  47         return bytes(x)
  48 else:
  49     def raw(x):
  50         """Builds a packet and returns its bytes representation.
  51         This function is and always be cross-version compatible"""
  52         return bytes(x)
  53 
  54     def bytes_encode(x):
  55         """Ensure that the given object is bytes.
  56         If the parameter is a packet, raw() should be preferred.
  57         """
  58         if isinstance(x, str):
  59             return x.encode()
  60         return bytes(x)
  61 
  62     def plain_str(x):
  63         """Convert basic byte objects to str"""
  64         if isinstance(x, bytes):
  65             return x.decode(errors="ignore")
  66         return str(x)
  67 
  68     def chb(x):
  69         """Same than chr() but encode as bytes."""
  70         return struct.pack("!B", x)
  71 
  72     def orb(x):
  73         """Return ord(x) when not already an int."""
  74         if isinstance(x, int):
  75             return x
  76         return ord(x)
  77 
  78 
  79 def bytes_hex(x):
  80     """Hexify a str or a bytes object"""
  81     return binascii.b2a_hex(bytes_encode(x))
  82 
  83 
  84 def hex_bytes(x):
  85     """De-hexify a str or a byte object"""
  86     return binascii.a2b_hex(bytes_encode(x))
  87 
  88 
  89 def base64_bytes(x):
  90     """Turn base64 into bytes"""
  91     if six.PY2:
  92         return base64.decodestring(x)
  93     return base64.decodebytes(bytes_encode(x))
  94 
  95 
  96 def bytes_base64(x):
  97     """Turn bytes into base64"""
  98     if six.PY2:
  99         return base64.encodestring(x).replace('\n', '')
  100     return base64.encodebytes(bytes_encode(x)).replace(b'\n', b'')
  101 
  102 
  103 if six.PY2:
  104     from StringIO import StringIO
  105 
  106     def gzip_decompress(x):
  107         """Decompress using gzip"""
  108         with gzip.GzipFile(fileobj=StringIO(x), mode='rb') as fdesc:
  109             return fdesc.read()
  110 
  111     def gzip_compress(x):
  112         """Compress using gzip"""
  113         buf = StringIO()
  114         with gzip.GzipFile(fileobj=buf, mode='wb') as fdesc:
  115             fdesc.write(x)
  116         return buf.getvalue()
  117 else:
  118     gzip_decompress = gzip.decompress
  119     gzip_compress = gzip.compress
  120 
  121 # Typing compatibility
  122 
  123 try:
  124     # Only required if using mypy-lang for static typing
  125     from typing import Optional, List, Union, Callable, Any, AnyStr, Tuple, \
  126         Sized, Dict, Pattern, cast
  127 except ImportError:
  128     # Let's make some fake ones.
  129 
  130     def cast(_type, obj):
  131         return obj
  132 
  133     class _FakeType(object):
  134         # make the objects subscriptable indefinetly
  135         def __getitem__(self, item):
  136             return _FakeType()
  137 
  138     Optional = _FakeType()
  139     Union = _FakeType()
  140     Callable = _FakeType()
  141     List = _FakeType()
  142     Dict = _FakeType()
  143     Any = _FakeType()
  144     AnyStr = _FakeType()
  145     Tuple = _FakeType()
  146     Pattern = _FakeType()
  147 
  148     class Sized(object):
  149         pass
  150
  ```
  --- 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/scapy/compat.py b/scapy/compat.py
  --- a/scapy/compat.py
  +++ b/scapy/compat.py
  @@ -59,11 +59,19 @@
               return x.encode()
           return bytes(x)
   
  -    def plain_str(x):
  -        """Convert basic byte objects to str"""
  -        if isinstance(x, bytes):
  -            return x.decode(errors="ignore")
  -        return str(x)
  +    if six.PY34:
  +        def plain_str(x):
  +            """Convert basic byte objects to str"""
  +            if isinstance(x, bytes):
  +                return x.decode(errors="ignore")
  +            return str(x)
  +    else:
  +        # Python 3.5+
  +        def plain_str(x):
  +            """Convert basic byte objects to str"""
  +            if isinstance(x, bytes):
  +                return x.decode(errors="backslashreplace")
  +            return str(x)
   
       def chb(x):
           """Same than chr() but encode as bytes."""
  
verification_info: {"golden_diff": "diff --git a/scapy/compat.py b/scapy/compat.py\n--- a/scapy/compat.py\n+++ b/scapy/compat.py\n@@ -59,11 +59,19 @@\n             return x.encode()\n         return bytes(x)\n \n-    def plain_str(x):\n-        \"\"\"Convert basic byte objects to str\"\"\"\n-        if isinstance(x, bytes):\n-            return x.decode(errors=\"ignore\")\n-        return str(x)\n+    if six.PY34:\n+        def plain_str(x):\n+            \"\"\"Convert basic byte objects to str\"\"\"\n+            if isinstance(x, bytes):\n+                return x.decode(errors=\"ignore\")\n+            return str(x)\n+    else:\n+        # Python 3.5+\n+        def plain_str(x):\n+            \"\"\"Convert basic byte objects to str\"\"\"\n+            if isinstance(x, bytes):\n+                return x.decode(errors=\"backslashreplace\")\n+            return str(x)\n \n     def chb(x):\n         \"\"\"Same than chr() but encode as bytes.\"\"\"\n", "issue": "plain_str not consistent between Py2 and Py3\n**Python 2 (expected result)**\r\n```python\r\n>>> plain_str(b'\\x3e\\xb4\\xef\\x2c\\x11')\r\n'>\\xb4\\xef,\\x11'\r\n```\r\n\r\n**Python 3 (unexpected result)**\r\n```python\r\n>>> plain_str(b'\\x3e\\xb4\\xef\\x2c\\x11')                                                                                                                                             \r\n'>,\\x11'\r\n```\r\n\r\n**Cause** is `errors=\"ignore\"`\r\n```python\r\ndef plain_str(x):                          \r\n    \"\"\"Convert basic byte objects to str\"\"\"\r\n    if isinstance(x, bytes):               \r\n        return x.decode(errors=\"ignore\")   \r\n    return str(x)       \r\n```\r\n\r\nIt just ignores values that are not in a valid range for the codec.\r\n\r\n**Possible fix**\r\n```python\r\ndef plain_str(x):                          \r\n    \"\"\"Convert basic byte objects to str\"\"\"\r\n    if isinstance(x, bytes):               \r\n        return x.decode(errors=\"backslashreplace\")   \r\n    return str(x)       \r\n```        \r\nBut this breaks compatibility for Python 3.4\r\n\r\n\n", "before_files": [{"content": "# This file is part of Scapy\n# See http://www.secdev.org/projects/scapy for more information\n# Copyright (C) Philippe Biondi <phil@secdev.org>\n# Copyright (C) Gabriel Potter <gabriel@potter.fr>\n# This program is published under a GPLv2 license\n\n\"\"\"\nPython 2 and 3 link classes.\n\"\"\"\n\nfrom __future__ import absolute_import\nimport base64\nimport binascii\nimport gzip\nimport struct\n\nimport scapy.modules.six as six\n\n###########\n# Python3 #\n###########\n\n\ndef lambda_tuple_converter(func):\n    \"\"\"\n    Converts a Python 2 function as\n      lambda (x,y): x + y\n    In the Python 3 format:\n      lambda x,y : x + y\n    \"\"\"\n    if func is not None and func.__code__.co_argcount == 1:\n        return lambda *args: func(args[0] if len(args) == 1 else args)\n    else:\n        return func\n\n\nif six.PY2:\n    bytes_encode = plain_str = str\n    chb = lambda x: x if isinstance(x, str) else chr(x)\n    orb = ord\n\n    def raw(x):\n        \"\"\"Builds a packet and returns its bytes representation.\n        This function is and always be cross-version compatible\"\"\"\n        if hasattr(x, \"__bytes__\"):\n            return x.__bytes__()\n        return bytes(x)\nelse:\n    def raw(x):\n        \"\"\"Builds a packet and returns its bytes representation.\n        This function is and always be cross-version compatible\"\"\"\n        return bytes(x)\n\n    def bytes_encode(x):\n        \"\"\"Ensure that the given object is bytes.\n        If the parameter is a packet, raw() should be preferred.\n        \"\"\"\n        if isinstance(x, str):\n            return x.encode()\n        return bytes(x)\n\n    def plain_str(x):\n        \"\"\"Convert basic byte objects to str\"\"\"\n        if isinstance(x, bytes):\n            return x.decode(errors=\"ignore\")\n        return str(x)\n\n    def chb(x):\n        \"\"\"Same than chr() but encode as bytes.\"\"\"\n        return struct.pack(\"!B\", x)\n\n    def orb(x):\n        \"\"\"Return ord(x) when not already an int.\"\"\"\n        if isinstance(x, int):\n            return x\n        return ord(x)\n\n\ndef bytes_hex(x):\n    \"\"\"Hexify a str or a bytes object\"\"\"\n    return binascii.b2a_hex(bytes_encode(x))\n\n\ndef hex_bytes(x):\n    \"\"\"De-hexify a str or a byte object\"\"\"\n    return binascii.a2b_hex(bytes_encode(x))\n\n\ndef base64_bytes(x):\n    \"\"\"Turn base64 into bytes\"\"\"\n    if six.PY2:\n        return base64.decodestring(x)\n    return base64.decodebytes(bytes_encode(x))\n\n\ndef bytes_base64(x):\n    \"\"\"Turn bytes into base64\"\"\"\n    if six.PY2:\n        return base64.encodestring(x).replace('\\n', '')\n    return base64.encodebytes(bytes_encode(x)).replace(b'\\n', b'')\n\n\nif six.PY2:\n    from StringIO import StringIO\n\n    def gzip_decompress(x):\n        \"\"\"Decompress using gzip\"\"\"\n        with gzip.GzipFile(fileobj=StringIO(x), mode='rb') as fdesc:\n            return fdesc.read()\n\n    def gzip_compress(x):\n        \"\"\"Compress using gzip\"\"\"\n        buf = StringIO()\n        with gzip.GzipFile(fileobj=buf, mode='wb') as fdesc:\n            fdesc.write(x)\n        return buf.getvalue()\nelse:\n    gzip_decompress = gzip.decompress\n    gzip_compress = gzip.compress\n\n# Typing compatibility\n\ntry:\n    # Only required if using mypy-lang for static typing\n    from typing import Optional, List, Union, Callable, Any, AnyStr, Tuple, \\\n        Sized, Dict, Pattern, cast\nexcept ImportError:\n    # Let's make some fake ones.\n\n    def cast(_type, obj):\n        return obj\n\n    class _FakeType(object):\n        # make the objects subscriptable indefinetly\n        def __getitem__(self, item):\n            return _FakeType()\n\n    Optional = _FakeType()\n    Union = _FakeType()\n    Callable = _FakeType()\n    List = _FakeType()\n    Dict = _FakeType()\n    Any = _FakeType()\n    AnyStr = _FakeType()\n    Tuple = _FakeType()\n    Pattern = _FakeType()\n\n    class Sized(object):\n        pass\n", "path": "scapy/compat.py"}], "after_files": [{"content": "# This file is part of Scapy\n# See http://www.secdev.org/projects/scapy for more information\n# Copyright (C) Philippe Biondi <phil@secdev.org>\n# Copyright (C) Gabriel Potter <gabriel@potter.fr>\n# This program is published under a GPLv2 license\n\n\"\"\"\nPython 2 and 3 link classes.\n\"\"\"\n\nfrom __future__ import absolute_import\nimport base64\nimport binascii\nimport gzip\nimport struct\n\nimport scapy.modules.six as six\n\n###########\n# Python3 #\n###########\n\n\ndef lambda_tuple_converter(func):\n    \"\"\"\n    Converts a Python 2 function as\n      lambda (x,y): x + y\n    In the Python 3 format:\n      lambda x,y : x + y\n    \"\"\"\n    if func is not None and func.__code__.co_argcount == 1:\n        return lambda *args: func(args[0] if len(args) == 1 else args)\n    else:\n        return func\n\n\nif six.PY2:\n    bytes_encode = plain_str = str\n    chb = lambda x: x if isinstance(x, str) else chr(x)\n    orb = ord\n\n    def raw(x):\n        \"\"\"Builds a packet and returns its bytes representation.\n        This function is and always be cross-version compatible\"\"\"\n        if hasattr(x, \"__bytes__\"):\n            return x.__bytes__()\n        return bytes(x)\nelse:\n    def raw(x):\n        \"\"\"Builds a packet and returns its bytes representation.\n        This function is and always be cross-version compatible\"\"\"\n        return bytes(x)\n\n    def bytes_encode(x):\n        \"\"\"Ensure that the given object is bytes.\n        If the parameter is a packet, raw() should be preferred.\n        \"\"\"\n        if isinstance(x, str):\n            return x.encode()\n        return bytes(x)\n\n    if six.PY34:\n        def plain_str(x):\n            \"\"\"Convert basic byte objects to str\"\"\"\n            if isinstance(x, bytes):\n                return x.decode(errors=\"ignore\")\n            return str(x)\n    else:\n        # Python 3.5+\n        def plain_str(x):\n            \"\"\"Convert basic byte objects to str\"\"\"\n            if isinstance(x, bytes):\n                return x.decode(errors=\"backslashreplace\")\n            return str(x)\n\n    def chb(x):\n        \"\"\"Same than chr() but encode as bytes.\"\"\"\n        return struct.pack(\"!B\", x)\n\n    def orb(x):\n        \"\"\"Return ord(x) when not already an int.\"\"\"\n        if isinstance(x, int):\n            return x\n        return ord(x)\n\n\ndef bytes_hex(x):\n    \"\"\"Hexify a str or a bytes object\"\"\"\n    return binascii.b2a_hex(bytes_encode(x))\n\n\ndef hex_bytes(x):\n    \"\"\"De-hexify a str or a byte object\"\"\"\n    return binascii.a2b_hex(bytes_encode(x))\n\n\ndef base64_bytes(x):\n    \"\"\"Turn base64 into bytes\"\"\"\n    if six.PY2:\n        return base64.decodestring(x)\n    return base64.decodebytes(bytes_encode(x))\n\n\ndef bytes_base64(x):\n    \"\"\"Turn bytes into base64\"\"\"\n    if six.PY2:\n        return base64.encodestring(x).replace('\\n', '')\n    return base64.encodebytes(bytes_encode(x)).replace(b'\\n', b'')\n\n\nif six.PY2:\n    from StringIO import StringIO\n\n    def gzip_decompress(x):\n        \"\"\"Decompress using gzip\"\"\"\n        with gzip.GzipFile(fileobj=StringIO(x), mode='rb') as fdesc:\n            return fdesc.read()\n\n    def gzip_compress(x):\n        \"\"\"Compress using gzip\"\"\"\n        buf = StringIO()\n        with gzip.GzipFile(fileobj=buf, mode='wb') as fdesc:\n            fdesc.write(x)\n        return buf.getvalue()\nelse:\n    gzip_decompress = gzip.decompress\n    gzip_compress = gzip.compress\n\n# Typing compatibility\n\ntry:\n    # Only required if using mypy-lang for static typing\n    from typing import Optional, List, Union, Callable, Any, AnyStr, Tuple, \\\n        Sized, Dict, Pattern, cast\nexcept ImportError:\n    # Let's make some fake ones.\n\n    def cast(_type, obj):\n        return obj\n\n    class _FakeType(object):\n        # make the objects subscriptable indefinetly\n        def __getitem__(self, item):\n            return _FakeType()\n\n    Optional = _FakeType()\n    Union = _FakeType()\n    Callable = _FakeType()\n    List = _FakeType()\n    Dict = _FakeType()\n    Any = _FakeType()\n    AnyStr = _FakeType()\n    Tuple = _FakeType()\n    Pattern = _FakeType()\n\n    class Sized(object):\n        pass\n", "path": "scapy/compat.py"}]}