We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
get_file_stream support
node-telegram-bot-api has added `getFileStream` method , which allows accessing the file stream without downloading it to a folder. It'll be useful.For example, changing a group photo from a photo uploaded by users.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `telegram/files/file.py`
Content:
```
1 #!/usr/bin/env python
2 #
3 # A library that provides a Python interface to the Telegram Bot API
4 # Copyright (C) 2015-2018
5 # Leandro Toledo de Souza <devs@python-telegram-bot.org>
6 #
7 # This program is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU Lesser Public License as published by
9 # the Free Software Foundation, either version 3 of the License, or
10 # (at your option) any later version.
11 #
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 # GNU Lesser Public License for more details.
16 #
17 # You should have received a copy of the GNU Lesser Public License
18 # along with this program.  If not, see [http://www.gnu.org/licenses/].
19 """This module contains an object that represents a Telegram File."""
20 from os.path import basename
21 
22 from future.backports.urllib import parse as urllib_parse
23 
24 from telegram import TelegramObject
25 
26 
27 class File(TelegramObject):
28     """
29     This object represents a file ready to be downloaded. The file can be downloaded with
30     :attr:`download`. It is guaranteed that the link will be valid for at least 1 hour. When the
31     link expires, a new one can be requested by calling getFile.
32 
33     Note:
34         Maximum file size to download is 20 MB
35 
36     Attributes:
37         file_id (:obj:`str`): Unique identifier for this file.
38         file_size (:obj:`str`): Optional. File size.
39         file_path (:obj:`str`): Optional. File path. Use :attr:`download` to get the file.
40 
41     Args:
42         file_id (:obj:`str`): Unique identifier for this file.
43         file_size (:obj:`int`, optional): Optional. File size, if known.
44         file_path (:obj:`str`, optional): File path. Use :attr:`download` to get the file.
45         bot (:obj:`telegram.Bot`, optional): Bot to use with shortcut method.
46         **kwargs (:obj:`dict`): Arbitrary keyword arguments.
47 
48     """
49 
50     def __init__(self, file_id, bot=None, file_size=None, file_path=None, **kwargs):
51         # Required
52         self.file_id = str(file_id)
53 
54         # Optionals
55         self.file_size = file_size
56         self.file_path = file_path
57 
58         self.bot = bot
59 
60         self._id_attrs = (self.file_id,)
61 
62     @classmethod
63     def de_json(cls, data, bot):
64         if not data:
65             return None
66 
67         return cls(bot=bot, **data)
68 
69     def download(self, custom_path=None, out=None, timeout=None):
70         """
71         Download this file. By default, the file is saved in the current working directory with its
72         original filename as reported by Telegram. If a :attr:`custom_path` is supplied, it will be
73         saved to that path instead. If :attr:`out` is defined, the file contents will be saved to
74         that object using the ``out.write`` method.
75 
76         Note:
77             `custom_path` and `out` are mutually exclusive.
78 
79         Args:
80             custom_path (:obj:`str`, optional): Custom path.
81             out (:obj:`object`, optional): A file-like object. Must be opened in binary mode, if
82                 applicable.
83             timeout (:obj:`int` | :obj:`float`, optional): If this value is specified, use it as
84                 the read timeout from the server (instead of the one specified during creation of
85                 the connection pool).
86 
87         Raises:
88             ValueError: If both ``custom_path`` and ``out`` are passed.
89 
90         """
91         if custom_path is not None and out is not None:
92             raise ValueError('custom_path and out are mutually exclusive')
93 
94         # Convert any UTF-8 char into a url encoded ASCII string.
95         sres = urllib_parse.urlsplit(self.file_path)
96         url = urllib_parse.urlunsplit(urllib_parse.SplitResult(
97             sres.scheme, sres.netloc, urllib_parse.quote(sres.path), sres.query, sres.fragment))
98 
99         if out:
100             buf = self.bot.request.retrieve(url)
101             out.write(buf)
102 
103         else:
104             if custom_path:
105                 filename = custom_path
106             else:
107                 filename = basename(self.file_path)
108 
109             self.bot.request.download(url, filename, timeout=timeout)
110
```
--- 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/telegram/files/file.py b/telegram/files/file.py
--- a/telegram/files/file.py
+++ b/telegram/files/file.py
@@ -74,32 +74,34 @@
         that object using the ``out.write`` method.
 
         Note:
-            `custom_path` and `out` are mutually exclusive.
+            :attr:`custom_path` and :attr:`out` are mutually exclusive.
 
         Args:
             custom_path (:obj:`str`, optional): Custom path.
-            out (:obj:`object`, optional): A file-like object. Must be opened in binary mode, if
-                applicable.
+            out (:obj:`io.BufferedWriter`, optional): A file-like object. Must be opened for
+                writing in binary mode, if applicable.
             timeout (:obj:`int` | :obj:`float`, optional): If this value is specified, use it as
                 the read timeout from the server (instead of the one specified during creation of
                 the connection pool).
 
+        Returns:
+            :obj:`str` | :obj:`io.BufferedWriter`: The same object as :attr:`out` if specified.
+            Otherwise, returns the filename downloaded to.
+
         Raises:
-            ValueError: If both ``custom_path`` and ``out`` are passed.
+            ValueError: If both :attr:`custom_path` and :attr:`out` are passed.
 
         """
         if custom_path is not None and out is not None:
             raise ValueError('custom_path and out are mutually exclusive')
 
         # Convert any UTF-8 char into a url encoded ASCII string.
-        sres = urllib_parse.urlsplit(self.file_path)
-        url = urllib_parse.urlunsplit(urllib_parse.SplitResult(
-            sres.scheme, sres.netloc, urllib_parse.quote(sres.path), sres.query, sres.fragment))
+        url = self._get_encoded_url()
 
         if out:
             buf = self.bot.request.retrieve(url)
             out.write(buf)
-
+            return out
         else:
             if custom_path:
                 filename = custom_path
@@ -107,3 +109,27 @@
                 filename = basename(self.file_path)
 
             self.bot.request.download(url, filename, timeout=timeout)
+            return filename
+
+    def _get_encoded_url(self):
+        """Convert any UTF-8 char in :obj:`File.file_path` into a url encoded ASCII string."""
+        sres = urllib_parse.urlsplit(self.file_path)
+        return urllib_parse.urlunsplit(urllib_parse.SplitResult(
+            sres.scheme, sres.netloc, urllib_parse.quote(sres.path), sres.query, sres.fragment))
+
+    def download_as_bytearray(self, buf=None):
+        """Download this file and return it as a bytearray.
+
+        Args:
+            buf (:obj:`bytearray`, optional): Extend the given bytearray with the downloaded data.
+
+        Returns:
+            :obj:`bytearray`: The same object as :attr:`buf` if it was specified. Otherwise a newly
+            allocated :obj:`bytearray`.
+
+        """
+        if buf is None:
+            buf = bytearray()
+
+        buf.extend(self.bot.request.retrieve(self._get_encoded_url()))
+        return buf

{"golden_diff": "diff --git a/telegram/files/file.py b/telegram/files/file.py\n--- a/telegram/files/file.py\n+++ b/telegram/files/file.py\n@@ -74,32 +74,34 @@\n         that object using the ``out.write`` method.\n \n         Note:\n-            `custom_path` and `out` are mutually exclusive.\n+            :attr:`custom_path` and :attr:`out` are mutually exclusive.\n \n         Args:\n             custom_path (:obj:`str`, optional): Custom path.\n-            out (:obj:`object`, optional): A file-like object. Must be opened in binary mode, if\n-                applicable.\n+            out (:obj:`io.BufferedWriter`, optional): A file-like object. Must be opened for\n+                writing in binary mode, if applicable.\n             timeout (:obj:`int` | :obj:`float`, optional): If this value is specified, use it as\n                 the read timeout from the server (instead of the one specified during creation of\n                 the connection pool).\n \n+        Returns:\n+            :obj:`str` | :obj:`io.BufferedWriter`: The same object as :attr:`out` if specified.\n+            Otherwise, returns the filename downloaded to.\n+\n         Raises:\n-            ValueError: If both ``custom_path`` and ``out`` are passed.\n+            ValueError: If both :attr:`custom_path` and :attr:`out` are passed.\n \n         \"\"\"\n         if custom_path is not None and out is not None:\n             raise ValueError('custom_path and out are mutually exclusive')\n \n         # Convert any UTF-8 char into a url encoded ASCII string.\n-        sres = urllib_parse.urlsplit(self.file_path)\n-        url = urllib_parse.urlunsplit(urllib_parse.SplitResult(\n-            sres.scheme, sres.netloc, urllib_parse.quote(sres.path), sres.query, sres.fragment))\n+        url = self._get_encoded_url()\n \n         if out:\n             buf = self.bot.request.retrieve(url)\n             out.write(buf)\n-\n+            return out\n         else:\n             if custom_path:\n                 filename = custom_path\n@@ -107,3 +109,27 @@\n                 filename = basename(self.file_path)\n \n             self.bot.request.download(url, filename, timeout=timeout)\n+            return filename\n+\n+    def _get_encoded_url(self):\n+        \"\"\"Convert any UTF-8 char in :obj:`File.file_path` into a url encoded ASCII string.\"\"\"\n+        sres = urllib_parse.urlsplit(self.file_path)\n+        return urllib_parse.urlunsplit(urllib_parse.SplitResult(\n+            sres.scheme, sres.netloc, urllib_parse.quote(sres.path), sres.query, sres.fragment))\n+\n+    def download_as_bytearray(self, buf=None):\n+        \"\"\"Download this file and return it as a bytearray.\n+\n+        Args:\n+            buf (:obj:`bytearray`, optional): Extend the given bytearray with the downloaded data.\n+\n+        Returns:\n+            :obj:`bytearray`: The same object as :attr:`buf` if it was specified. Otherwise a newly\n+            allocated :obj:`bytearray`.\n+\n+        \"\"\"\n+        if buf is None:\n+            buf = bytearray()\n+\n+        buf.extend(self.bot.request.retrieve(self._get_encoded_url()))\n+        return buf\n", "issue": "get_file_stream support\nnode-telegram-bot-api has added `getFileStream` method , which allows accessing the file stream without downloading it to a folder. It'll be useful.For example, changing a group photo from a photo uploaded by users.\n", "before_files": [{"content": "#!/usr/bin/env python\n#\n# A library that provides a Python interface to the Telegram Bot API\n# Copyright (C) 2015-2018\n# Leandro Toledo de Souza <devs@python-telegram-bot.org>\n#\n# This program is free software: you can redistribute it and/or modify\n# it under the terms of the GNU Lesser Public License as published by\n# the Free Software Foundation, either version 3 of the License, or\n# (at your option) any later version.\n#\n# This program is distributed in the hope that it will be useful,\n# but WITHOUT ANY WARRANTY; without even the implied warranty of\n# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n# GNU Lesser Public License for more details.\n#\n# You should have received a copy of the GNU Lesser Public License\n# along with this program.  If not, see [http://www.gnu.org/licenses/].\n\"\"\"This module contains an object that represents a Telegram File.\"\"\"\nfrom os.path import basename\n\nfrom future.backports.urllib import parse as urllib_parse\n\nfrom telegram import TelegramObject\n\n\nclass File(TelegramObject):\n    \"\"\"\n    This object represents a file ready to be downloaded. The file can be downloaded with\n    :attr:`download`. It is guaranteed that the link will be valid for at least 1 hour. When the\n    link expires, a new one can be requested by calling getFile.\n\n    Note:\n        Maximum file size to download is 20 MB\n\n    Attributes:\n        file_id (:obj:`str`): Unique identifier for this file.\n        file_size (:obj:`str`): Optional. File size.\n        file_path (:obj:`str`): Optional. File path. Use :attr:`download` to get the file.\n\n    Args:\n        file_id (:obj:`str`): Unique identifier for this file.\n        file_size (:obj:`int`, optional): Optional. File size, if known.\n        file_path (:obj:`str`, optional): File path. Use :attr:`download` to get the file.\n        bot (:obj:`telegram.Bot`, optional): Bot to use with shortcut method.\n        **kwargs (:obj:`dict`): Arbitrary keyword arguments.\n\n    \"\"\"\n\n    def __init__(self, file_id, bot=None, file_size=None, file_path=None, **kwargs):\n        # Required\n        self.file_id = str(file_id)\n\n        # Optionals\n        self.file_size = file_size\n        self.file_path = file_path\n\n        self.bot = bot\n\n        self._id_attrs = (self.file_id,)\n\n    @classmethod\n    def de_json(cls, data, bot):\n        if not data:\n            return None\n\n        return cls(bot=bot, **data)\n\n    def download(self, custom_path=None, out=None, timeout=None):\n        \"\"\"\n        Download this file. By default, the file is saved in the current working directory with its\n        original filename as reported by Telegram. If a :attr:`custom_path` is supplied, it will be\n        saved to that path instead. If :attr:`out` is defined, the file contents will be saved to\n        that object using the ``out.write`` method.\n\n        Note:\n            `custom_path` and `out` are mutually exclusive.\n\n        Args:\n            custom_path (:obj:`str`, optional): Custom path.\n            out (:obj:`object`, optional): A file-like object. Must be opened in binary mode, if\n                applicable.\n            timeout (:obj:`int` | :obj:`float`, optional): If this value is specified, use it as\n                the read timeout from the server (instead of the one specified during creation of\n                the connection pool).\n\n        Raises:\n            ValueError: If both ``custom_path`` and ``out`` are passed.\n\n        \"\"\"\n        if custom_path is not None and out is not None:\n            raise ValueError('custom_path and out are mutually exclusive')\n\n        # Convert any UTF-8 char into a url encoded ASCII string.\n        sres = urllib_parse.urlsplit(self.file_path)\n        url = urllib_parse.urlunsplit(urllib_parse.SplitResult(\n            sres.scheme, sres.netloc, urllib_parse.quote(sres.path), sres.query, sres.fragment))\n\n        if out:\n            buf = self.bot.request.retrieve(url)\n            out.write(buf)\n\n        else:\n            if custom_path:\n                filename = custom_path\n            else:\n                filename = basename(self.file_path)\n\n            self.bot.request.download(url, filename, timeout=timeout)\n", "path": "telegram/files/file.py"}], "after_files": [{"content": "#!/usr/bin/env python\n#\n# A library that provides a Python interface to the Telegram Bot API\n# Copyright (C) 2015-2018\n# Leandro Toledo de Souza <devs@python-telegram-bot.org>\n#\n# This program is free software: you can redistribute it and/or modify\n# it under the terms of the GNU Lesser Public License as published by\n# the Free Software Foundation, either version 3 of the License, or\n# (at your option) any later version.\n#\n# This program is distributed in the hope that it will be useful,\n# but WITHOUT ANY WARRANTY; without even the implied warranty of\n# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n# GNU Lesser Public License for more details.\n#\n# You should have received a copy of the GNU Lesser Public License\n# along with this program.  If not, see [http://www.gnu.org/licenses/].\n\"\"\"This module contains an object that represents a Telegram File.\"\"\"\nfrom os.path import basename\n\nfrom future.backports.urllib import parse as urllib_parse\n\nfrom telegram import TelegramObject\n\n\nclass File(TelegramObject):\n    \"\"\"\n    This object represents a file ready to be downloaded. The file can be downloaded with\n    :attr:`download`. It is guaranteed that the link will be valid for at least 1 hour. When the\n    link expires, a new one can be requested by calling getFile.\n\n    Note:\n        Maximum file size to download is 20 MB\n\n    Attributes:\n        file_id (:obj:`str`): Unique identifier for this file.\n        file_size (:obj:`str`): Optional. File size.\n        file_path (:obj:`str`): Optional. File path. Use :attr:`download` to get the file.\n\n    Args:\n        file_id (:obj:`str`): Unique identifier for this file.\n        file_size (:obj:`int`, optional): Optional. File size, if known.\n        file_path (:obj:`str`, optional): File path. Use :attr:`download` to get the file.\n        bot (:obj:`telegram.Bot`, optional): Bot to use with shortcut method.\n        **kwargs (:obj:`dict`): Arbitrary keyword arguments.\n\n    \"\"\"\n\n    def __init__(self, file_id, bot=None, file_size=None, file_path=None, **kwargs):\n        # Required\n        self.file_id = str(file_id)\n\n        # Optionals\n        self.file_size = file_size\n        self.file_path = file_path\n\n        self.bot = bot\n\n        self._id_attrs = (self.file_id,)\n\n    @classmethod\n    def de_json(cls, data, bot):\n        if not data:\n            return None\n\n        return cls(bot=bot, **data)\n\n    def download(self, custom_path=None, out=None, timeout=None):\n        \"\"\"\n        Download this file. By default, the file is saved in the current working directory with its\n        original filename as reported by Telegram. If a :attr:`custom_path` is supplied, it will be\n        saved to that path instead. If :attr:`out` is defined, the file contents will be saved to\n        that object using the ``out.write`` method.\n\n        Note:\n            :attr:`custom_path` and :attr:`out` are mutually exclusive.\n\n        Args:\n            custom_path (:obj:`str`, optional): Custom path.\n            out (:obj:`io.BufferedWriter`, optional): A file-like object. Must be opened for\n                writing in binary mode, if applicable.\n            timeout (:obj:`int` | :obj:`float`, optional): If this value is specified, use it as\n                the read timeout from the server (instead of the one specified during creation of\n                the connection pool).\n\n        Returns:\n            :obj:`str` | :obj:`io.BufferedWriter`: The same object as :attr:`out` if specified.\n            Otherwise, returns the filename downloaded to.\n\n        Raises:\n            ValueError: If both :attr:`custom_path` and :attr:`out` are passed.\n\n        \"\"\"\n        if custom_path is not None and out is not None:\n            raise ValueError('custom_path and out are mutually exclusive')\n\n        # Convert any UTF-8 char into a url encoded ASCII string.\n        url = self._get_encoded_url()\n\n        if out:\n            buf = self.bot.request.retrieve(url)\n            out.write(buf)\n            return out\n        else:\n            if custom_path:\n                filename = custom_path\n            else:\n                filename = basename(self.file_path)\n\n            self.bot.request.download(url, filename, timeout=timeout)\n            return filename\n\n    def _get_encoded_url(self):\n        \"\"\"Convert any UTF-8 char in :obj:`File.file_path` into a url encoded ASCII string.\"\"\"\n        sres = urllib_parse.urlsplit(self.file_path)\n        return urllib_parse.urlunsplit(urllib_parse.SplitResult(\n            sres.scheme, sres.netloc, urllib_parse.quote(sres.path), sres.query, sres.fragment))\n\n    def download_as_bytearray(self, buf=None):\n        \"\"\"Download this file and return it as a bytearray.\n\n        Args:\n            buf (:obj:`bytearray`, optional): Extend the given bytearray with the downloaded data.\n\n        Returns:\n            :obj:`bytearray`: The same object as :attr:`buf` if it was specified. Otherwise a newly\n            allocated :obj:`bytearray`.\n\n        \"\"\"\n        if buf is None:\n            buf = bytearray()\n\n        buf.extend(self.bot.request.retrieve(self._get_encoded_url()))\n        return buf\n", "path": "telegram/files/file.py"}]}