We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
pep2rss can raise UnicodeEncodeError on certain platforms
This is due to the default encoding of [`open()`](https://docs.python.org/3/library/functions.html#open) being platform dependent.

For example, on Windows (CP-1252), it can raise
`UnicodeEncodeError: 'charmap' codec can't encode character '\u0141' in position 1545: character maps to <undefined>`
when handling the character, 'Ł', in the name of the author of [PEP 569](https://www.python.org/dev/peps/pep-0569/).
https://github.com/python/peps/blob/433faca4cf1bb8a0550d01b86b2b4581b3eda460/pep-0569.rst#L5

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `pep2rss.py`
Content:
```
1 #!/usr/bin/env python
2 
3 # usage: pep-hook.py $REPOS $REV
4 # (standard post-commit args)
5 
6 import os, glob, time, datetime, stat, re, sys
7 import codecs
8 import PyRSS2Gen as rssgen
9 
10 RSS_PATH = os.path.join(sys.argv[1], 'peps.rss')
11 
12 def firstline_startingwith(full_path, text):
13     for line in codecs.open(full_path, encoding="utf-8"):
14         if line.startswith(text):
15             return line[len(text):].strip()
16     return None
17 
18 # get list of peps with creation time (from "Created:" string in pep .txt)
19 peps = glob.glob('pep-*.txt')
20 def pep_creation_dt(full_path):
21     created_str = firstline_startingwith(full_path, 'Created:')
22     # bleh, I was hoping to avoid re but some PEPs editorialize
23     # on the Created line
24     m = re.search(r'''(\d+-\w+-\d{4})''', created_str)
25     if not m:
26         # some older ones have an empty line, that's okay, if it's old
27         # we ipso facto don't care about it.
28         # "return None" would make the most sense but datetime objects
29         # refuse to compare with that. :-|
30         return datetime.datetime(*time.localtime(0)[:6])
31     created_str = m.group(1)
32     try:
33         t = time.strptime(created_str, '%d-%b-%Y')
34     except ValueError:
35         t = time.strptime(created_str, '%d-%B-%Y')
36     return datetime.datetime(*t[:6])
37 peps_with_dt = [(pep_creation_dt(full_path), full_path) for full_path in peps]
38 # sort peps by date, newest first
39 peps_with_dt.sort(reverse=True)
40 
41 # generate rss items for 10 most recent peps
42 items = []
43 for dt, full_path in peps_with_dt[:10]:
44     try:
45         n = int(full_path.split('-')[-1].split('.')[0])
46     except ValueError:
47         pass
48     title = firstline_startingwith(full_path, 'Title:')
49     author = firstline_startingwith(full_path, 'Author:')
50     url = 'http://www.python.org/dev/peps/pep-%0.4d' % n
51     item = rssgen.RSSItem(
52         title = 'PEP %d: %s' % (n, title),
53         link = url,
54         description = 'Author: %s' % author,
55         guid = rssgen.Guid(url),
56         pubDate = dt)
57     items.append(item)
58 
59 # the rss envelope
60 desc = """
61 Newest Python Enhancement Proposals (PEPs) - Information on new
62 language features, and some meta-information like release
63 procedure and schedules
64 """.strip()
65 rss = rssgen.RSS2(
66     title = 'Newest Python PEPs',
67     link = 'http://www.python.org/dev/peps',
68     description = desc,
69     lastBuildDate = datetime.datetime.now(),
70     items = items)
71 
72 with open(RSS_PATH, 'w') as fp:
73     fp.write(rss.to_xml())
74
```
--- 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/pep2rss.py b/pep2rss.py
--- a/pep2rss.py
+++ b/pep2rss.py
@@ -1,16 +1,15 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # usage: pep-hook.py $REPOS $REV
 # (standard post-commit args)
 
 import os, glob, time, datetime, stat, re, sys
-import codecs
 import PyRSS2Gen as rssgen
 
 RSS_PATH = os.path.join(sys.argv[1], 'peps.rss')
 
 def firstline_startingwith(full_path, text):
-    for line in codecs.open(full_path, encoding="utf-8"):
+    for line in open(full_path, encoding="utf-8"):
         if line.startswith(text):
             return line[len(text):].strip()
     return None
@@ -69,5 +68,5 @@
     lastBuildDate = datetime.datetime.now(),
     items = items)
 
-with open(RSS_PATH, 'w') as fp:
-    fp.write(rss.to_xml())
+with open(RSS_PATH, 'w', encoding="utf-8") as fp:
+    fp.write(rss.to_xml(encoding="utf-8"))

{"golden_diff": "diff --git a/pep2rss.py b/pep2rss.py\n--- a/pep2rss.py\n+++ b/pep2rss.py\n@@ -1,16 +1,15 @@\n-#!/usr/bin/env python\n+#!/usr/bin/env python3\n \n # usage: pep-hook.py $REPOS $REV\n # (standard post-commit args)\n \n import os, glob, time, datetime, stat, re, sys\n-import codecs\n import PyRSS2Gen as rssgen\n \n RSS_PATH = os.path.join(sys.argv[1], 'peps.rss')\n \n def firstline_startingwith(full_path, text):\n-    for line in codecs.open(full_path, encoding=\"utf-8\"):\n+    for line in open(full_path, encoding=\"utf-8\"):\n         if line.startswith(text):\n             return line[len(text):].strip()\n     return None\n@@ -69,5 +68,5 @@\n     lastBuildDate = datetime.datetime.now(),\n     items = items)\n \n-with open(RSS_PATH, 'w') as fp:\n-    fp.write(rss.to_xml())\n+with open(RSS_PATH, 'w', encoding=\"utf-8\") as fp:\n+    fp.write(rss.to_xml(encoding=\"utf-8\"))\n", "issue": "pep2rss can raise UnicodeEncodeError on certain platforms\nThis is due to the default encoding of [`open()`](https://docs.python.org/3/library/functions.html#open) being platform dependent.\r\n\r\nFor example, on Windows (CP-1252), it can raise\r\n`UnicodeEncodeError: 'charmap' codec can't encode character '\\u0141' in position 1545: character maps to <undefined>`\r\nwhen handling the character, '\u0141', in the name of the author of [PEP 569](https://www.python.org/dev/peps/pep-0569/).\r\nhttps://github.com/python/peps/blob/433faca4cf1bb8a0550d01b86b2b4581b3eda460/pep-0569.rst#L5\n", "before_files": [{"content": "#!/usr/bin/env python\n\n# usage: pep-hook.py $REPOS $REV\n# (standard post-commit args)\n\nimport os, glob, time, datetime, stat, re, sys\nimport codecs\nimport PyRSS2Gen as rssgen\n\nRSS_PATH = os.path.join(sys.argv[1], 'peps.rss')\n\ndef firstline_startingwith(full_path, text):\n    for line in codecs.open(full_path, encoding=\"utf-8\"):\n        if line.startswith(text):\n            return line[len(text):].strip()\n    return None\n\n# get list of peps with creation time (from \"Created:\" string in pep .txt)\npeps = glob.glob('pep-*.txt')\ndef pep_creation_dt(full_path):\n    created_str = firstline_startingwith(full_path, 'Created:')\n    # bleh, I was hoping to avoid re but some PEPs editorialize\n    # on the Created line\n    m = re.search(r'''(\\d+-\\w+-\\d{4})''', created_str)\n    if not m:\n        # some older ones have an empty line, that's okay, if it's old\n        # we ipso facto don't care about it.\n        # \"return None\" would make the most sense but datetime objects\n        # refuse to compare with that. :-|\n        return datetime.datetime(*time.localtime(0)[:6])\n    created_str = m.group(1)\n    try:\n        t = time.strptime(created_str, '%d-%b-%Y')\n    except ValueError:\n        t = time.strptime(created_str, '%d-%B-%Y')\n    return datetime.datetime(*t[:6])\npeps_with_dt = [(pep_creation_dt(full_path), full_path) for full_path in peps]\n# sort peps by date, newest first\npeps_with_dt.sort(reverse=True)\n\n# generate rss items for 10 most recent peps\nitems = []\nfor dt, full_path in peps_with_dt[:10]:\n    try:\n        n = int(full_path.split('-')[-1].split('.')[0])\n    except ValueError:\n        pass\n    title = firstline_startingwith(full_path, 'Title:')\n    author = firstline_startingwith(full_path, 'Author:')\n    url = 'http://www.python.org/dev/peps/pep-%0.4d' % n\n    item = rssgen.RSSItem(\n        title = 'PEP %d: %s' % (n, title),\n        link = url,\n        description = 'Author: %s' % author,\n        guid = rssgen.Guid(url),\n        pubDate = dt)\n    items.append(item)\n\n# the rss envelope\ndesc = \"\"\"\nNewest Python Enhancement Proposals (PEPs) - Information on new\nlanguage features, and some meta-information like release\nprocedure and schedules\n\"\"\".strip()\nrss = rssgen.RSS2(\n    title = 'Newest Python PEPs',\n    link = 'http://www.python.org/dev/peps',\n    description = desc,\n    lastBuildDate = datetime.datetime.now(),\n    items = items)\n\nwith open(RSS_PATH, 'w') as fp:\n    fp.write(rss.to_xml())\n", "path": "pep2rss.py"}], "after_files": [{"content": "#!/usr/bin/env python3\n\n# usage: pep-hook.py $REPOS $REV\n# (standard post-commit args)\n\nimport os, glob, time, datetime, stat, re, sys\nimport PyRSS2Gen as rssgen\n\nRSS_PATH = os.path.join(sys.argv[1], 'peps.rss')\n\ndef firstline_startingwith(full_path, text):\n    for line in open(full_path, encoding=\"utf-8\"):\n        if line.startswith(text):\n            return line[len(text):].strip()\n    return None\n\n# get list of peps with creation time (from \"Created:\" string in pep .txt)\npeps = glob.glob('pep-*.txt')\ndef pep_creation_dt(full_path):\n    created_str = firstline_startingwith(full_path, 'Created:')\n    # bleh, I was hoping to avoid re but some PEPs editorialize\n    # on the Created line\n    m = re.search(r'''(\\d+-\\w+-\\d{4})''', created_str)\n    if not m:\n        # some older ones have an empty line, that's okay, if it's old\n        # we ipso facto don't care about it.\n        # \"return None\" would make the most sense but datetime objects\n        # refuse to compare with that. :-|\n        return datetime.datetime(*time.localtime(0)[:6])\n    created_str = m.group(1)\n    try:\n        t = time.strptime(created_str, '%d-%b-%Y')\n    except ValueError:\n        t = time.strptime(created_str, '%d-%B-%Y')\n    return datetime.datetime(*t[:6])\npeps_with_dt = [(pep_creation_dt(full_path), full_path) for full_path in peps]\n# sort peps by date, newest first\npeps_with_dt.sort(reverse=True)\n\n# generate rss items for 10 most recent peps\nitems = []\nfor dt, full_path in peps_with_dt[:10]:\n    try:\n        n = int(full_path.split('-')[-1].split('.')[0])\n    except ValueError:\n        pass\n    title = firstline_startingwith(full_path, 'Title:')\n    author = firstline_startingwith(full_path, 'Author:')\n    url = 'http://www.python.org/dev/peps/pep-%0.4d' % n\n    item = rssgen.RSSItem(\n        title = 'PEP %d: %s' % (n, title),\n        link = url,\n        description = 'Author: %s' % author,\n        guid = rssgen.Guid(url),\n        pubDate = dt)\n    items.append(item)\n\n# the rss envelope\ndesc = \"\"\"\nNewest Python Enhancement Proposals (PEPs) - Information on new\nlanguage features, and some meta-information like release\nprocedure and schedules\n\"\"\".strip()\nrss = rssgen.RSS2(\n    title = 'Newest Python PEPs',\n    link = 'http://www.python.org/dev/peps',\n    description = desc,\n    lastBuildDate = datetime.datetime.now(),\n    items = items)\n\nwith open(RSS_PATH, 'w', encoding=\"utf-8\") as fp:\n    fp.write(rss.to_xml(encoding=\"utf-8\"))\n", "path": "pep2rss.py"}]}