--- opt/SageMath/local/lib/python3.9/site-packages/sage/combinat/posets/poset_examples.py.bu	2021-08-22 19:12:42.000000000 +1000
+++ opt/SageMath/local/lib/python3.9/site-packages/sage/combinat/posets/poset_examples.py	2022-01-02 13:10:42.447658457 +1100
@@ -155,7 +155,7 @@
 
     @staticmethod
     def BooleanLattice(n, facade=None, use_subsets=False):
-        """
+        r"""
         Return the Boolean lattice containing `2^n` elements.
 
         - ``n`` -- integer; number of elements will be `2^n`
--- opt/SageMath/local/lib/python3.9/site-packages/traitlets/config/loader.py.bu	2021-08-22 22:00:01.000000000 +1000
+++ opt/SageMath/local/lib/python3.9/site-packages/traitlets/config/loader.py	2022-01-11 11:39:00.600018177 +1100
@@ -792,7 +792,7 @@
                 nargs = '?'
             else:
                 nargs = None
-            if len(key) is 1:
+            if len(key) == 1:
                 paa('-'+key, '--'+key, type=text_type, dest=value, nargs=nargs)
             else:
                 paa('--'+key, type=text_type, dest=value, nargs=nargs)
@@ -801,7 +801,7 @@
                 #
                 self.alias_flags[self.aliases[key]] = value
                 continue
-            if len(key) is 1:
+            if len(key) == 1:
                 paa('-'+key, '--'+key, action='append_const', dest='_flags', const=value)
             else:
                 paa('--'+key, action='append_const', dest='_flags', const=value)
--- opt/SageMath/local/lib/python3.9/site-packages/psutil/_pslinux.py.bu	2021-08-22 21:58:18.000000000 +1000
+++ opt/SageMath/local/lib/python3.9/site-packages/psutil/_pslinux.py	2022-01-11 12:14:46.007349527 +1100
@@ -548,7 +548,7 @@
         # https://github.com/giampaolo/psutil/issues/200
         # try to parse /proc/stat as a last resort
         if num == 0:
-            search = re.compile('cpu\d')
+            search = re.compile(r'cpu\d')
             with open_text('%s/stat' % get_procfs_path()) as f:
                 for line in f:
                     line = line.split(' ')[0]
@@ -1465,9 +1465,9 @@
         @wrap_exceptions
         def memory_full_info(
                 self,
-                _private_re=re.compile(b"Private.*:\s+(\d+)"),
-                _pss_re=re.compile(b"Pss.*:\s+(\d+)"),
-                _swap_re=re.compile(b"Swap.*:\s+(\d+)")):
+                _private_re=re.compile(br"Private.*:\s+(\d+)"),
+                _pss_re=re.compile(br"Pss.*:\s+(\d+)"),
+                _swap_re=re.compile(br"Swap.*:\s+(\d+)")):
             basic_mem = self.memory_info()
             # Note: using 3 regexes is faster than reading the file
             # line by line.
@@ -1580,7 +1580,7 @@
             raise
 
     @wrap_exceptions
-    def num_ctx_switches(self, _ctxsw_re=re.compile(b'ctxt_switches:\t(\d+)')):
+    def num_ctx_switches(self, _ctxsw_re=re.compile(br'ctxt_switches:\t(\d+)')):
         data = self._read_status_file()
         ctxsw = _ctxsw_re.findall(data)
         if not ctxsw:
@@ -1593,7 +1593,7 @@
             return _common.pctxsw(int(ctxsw[0]), int(ctxsw[1]))
 
     @wrap_exceptions
-    def num_threads(self, _num_threads_re=re.compile(b'Threads:\t(\d+)')):
+    def num_threads(self, _num_threads_re=re.compile(br'Threads:\t(\d+)')):
         # Note: on Python 3 using a re is faster than iterating over file
         # line by line. On Python 2 is the exact opposite, and iterating
         # over a file on Python 3 is slower than on Python 2.
@@ -1649,7 +1649,7 @@
         return cext.proc_cpu_affinity_get(self.pid)
 
     def _get_eligible_cpus(
-            self, _re=re.compile(b"Cpus_allowed_list:\t(\d+)-(\d+)")):
+            self, _re=re.compile(br"Cpus_allowed_list:\t(\d+)-(\d+)")):
         # See: https://github.com/giampaolo/psutil/issues/956
         data = self._read_status_file()
         match = _re.findall(data)
@@ -1811,13 +1811,13 @@
         return int(self._parse_stat_file()[2])
 
     @wrap_exceptions
-    def uids(self, _uids_re=re.compile(b'Uid:\t(\d+)\t(\d+)\t(\d+)')):
+    def uids(self, _uids_re=re.compile(br'Uid:\t(\d+)\t(\d+)\t(\d+)')):
         data = self._read_status_file()
         real, effective, saved = _uids_re.findall(data)[0]
         return _common.puids(int(real), int(effective), int(saved))
 
     @wrap_exceptions
-    def gids(self, _gids_re=re.compile(b'Gid:\t(\d+)\t(\d+)\t(\d+)')):
+    def gids(self, _gids_re=re.compile(br'Gid:\t(\d+)\t(\d+)\t(\d+)')):
         data = self._read_status_file()
         real, effective, saved = _gids_re.findall(data)[0]
         return _common.pgids(int(real), int(effective), int(saved))
./opt/SageMath/local/lib/python3.9/site-packages/sage/symbolic/RCS
diff -u -r1.1 expression_conversions.py
--- opt/SageMath/local/lib/python3.9/site-packages/sage/symbolic/expression_conversions.py	2021/08/22 09:12:43	1.1
+++ opt/SageMath/local/lib/python3.9/site-packages/sage/symbolic/expression_conversions.py	2022/01/28 02:07:09
@@ -969,7 +969,7 @@
         super(FriCASConverter, self).__init__(sage.interfaces.fricas.fricas)
 
     def pyobject(self, ex, obj):
-        """
+        r"""
         Return a string which, when evaluated by FriCAS, returns the
         object as an expression.
 
./opt/SageMath/local/lib/python3.9/site-packages/IPython/core/RCS
diff -u -r1.1 oinspect.py
./opt/SageMath/local/lib/python3.9/site-packages/requests/RCS
diff -u -r1.1 api.py
--- opt/SageMath/local/lib/python3.9/site-packages/requests/api.py	2021/08/22 11:52:24	1.1
+++ opt/SageMath/local/lib/python3.9/site-packages/requests/api.py	2022/01/28 00:49:42
@@ -57,7 +57,7 @@
 
 
 def get(url, params=None, **kwargs):
-    """Sends a GET request.
+    r"""Sends a GET request.
 
     :param url: URL for the new :class:`Request` object.
     :param params: (optional) Dictionary or bytes to be sent in the query string for the :class:`Request`.
@@ -71,7 +71,7 @@
 
 
 def options(url, **kwargs):
-    """Sends a OPTIONS request.
+    r"""Sends a OPTIONS request.
 
     :param url: URL for the new :class:`Request` object.
     :param \*\*kwargs: Optional arguments that ``request`` takes.
@@ -84,7 +84,7 @@
 
 
 def head(url, **kwargs):
-    """Sends a HEAD request.
+    r"""Sends a HEAD request.
 
     :param url: URL for the new :class:`Request` object.
     :param \*\*kwargs: Optional arguments that ``request`` takes.
@@ -97,7 +97,7 @@
 
 
 def post(url, data=None, json=None, **kwargs):
-    """Sends a POST request.
+    r"""Sends a POST request.
 
     :param url: URL for the new :class:`Request` object.
     :param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`.
@@ -111,7 +111,7 @@
 
 
 def put(url, data=None, **kwargs):
-    """Sends a PUT request.
+    r"""Sends a PUT request.
 
     :param url: URL for the new :class:`Request` object.
     :param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`.
@@ -125,7 +125,7 @@
 
 
 def patch(url, data=None, **kwargs):
-    """Sends a PATCH request.
+    r"""Sends a PATCH request.
 
     :param url: URL for the new :class:`Request` object.
     :param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`.
@@ -139,7 +139,7 @@
 
 
 def delete(url, **kwargs):
-    """Sends a DELETE request.
+    r"""Sends a DELETE request.
 
     :param url: URL for the new :class:`Request` object.
     :param \*\*kwargs: Optional arguments that ``request`` takes.
diff -u -r1.1 models.py
--- opt/SageMath/local/lib/python3.9/site-packages/requests/models.py	2021/08/22 11:52:24	1.1
+++ opt/SageMath/local/lib/python3.9/site-packages/requests/models.py	2022/01/28 00:45:51
@@ -840,7 +840,7 @@
         return content
 
     def json(self, **kwargs):
-        """Returns the json-encoded content of a response, if any.
+        r"""Returns the json-encoded content of a response, if any.
 
         :param \*\*kwargs: Optional arguments that ``json.loads`` takes.
         :raises ValueError: If the response body does not contain valid json.
diff -u -r1.1 sessions.py
--- opt/SageMath/local/lib/python3.9/site-packages/requests/sessions.py	2021/08/22 11:52:24	1.1
+++ opt/SageMath/local/lib/python3.9/site-packages/requests/sessions.py	2022/01/28 01:00:24
@@ -490,7 +490,7 @@
         return resp
 
     def get(self, url, **kwargs):
-        """Sends a GET request. Returns :class:`Response` object.
+        r"""Sends a GET request. Returns :class:`Response` object.
 
         :param url: URL for the new :class:`Request` object.
         :param \*\*kwargs: Optional arguments that ``request`` takes.
@@ -501,7 +501,7 @@
         return self.request('GET', url, **kwargs)
 
     def options(self, url, **kwargs):
-        """Sends a OPTIONS request. Returns :class:`Response` object.
+        r"""Sends a OPTIONS request. Returns :class:`Response` object.
 
         :param url: URL for the new :class:`Request` object.
         :param \*\*kwargs: Optional arguments that ``request`` takes.
@@ -512,7 +512,7 @@
         return self.request('OPTIONS', url, **kwargs)
 
     def head(self, url, **kwargs):
-        """Sends a HEAD request. Returns :class:`Response` object.
+        r"""Sends a HEAD request. Returns :class:`Response` object.
 
         :param url: URL for the new :class:`Request` object.
         :param \*\*kwargs: Optional arguments that ``request`` takes.
@@ -523,7 +523,7 @@
         return self.request('HEAD', url, **kwargs)
 
     def post(self, url, data=None, json=None, **kwargs):
-        """Sends a POST request. Returns :class:`Response` object.
+        r"""Sends a POST request. Returns :class:`Response` object.
 
         :param url: URL for the new :class:`Request` object.
         :param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`.
@@ -535,7 +535,7 @@
         return self.request('POST', url, data=data, json=json, **kwargs)
 
     def put(self, url, data=None, **kwargs):
-        """Sends a PUT request. Returns :class:`Response` object.
+        r"""Sends a PUT request. Returns :class:`Response` object.
 
         :param url: URL for the new :class:`Request` object.
         :param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`.
@@ -546,7 +546,7 @@
         return self.request('PUT', url, data=data, **kwargs)
 
     def patch(self, url, data=None, **kwargs):
-        """Sends a PATCH request. Returns :class:`Response` object.
+        r"""Sends a PATCH request. Returns :class:`Response` object.
 
         :param url: URL for the new :class:`Request` object.
         :param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`.
@@ -557,7 +557,7 @@
         return self.request('PATCH', url,  data=data, **kwargs)
 
     def delete(self, url, **kwargs):
-        """Sends a DELETE request. Returns :class:`Response` object.
+        r"""Sends a DELETE request. Returns :class:`Response` object.
 
         :param url: URL for the new :class:`Request` object.
         :param \*\*kwargs: Optional arguments that ``request`` takes.