Devcontainer + Fix python 3.13 warning

.devcontainer/Dockerfile

@@ -0,0 +1,19 @@
+FROM python:3.13-slim
+
+# Install Java
+RUN apt update &&  \
+    apt install -y curl telnet git
+
+## Pip dependencies
+# Upgrade pip
+RUN pip install --upgrade pip
+
+# Install production dependencies
+COPY requirements.txt /tmp/requirements.txt
+RUN pip install -r /tmp/requirements.txt && \
+    rm /tmp/requirements.txt
+
+# Install development dependencies
+COPY dev-requirements.txt /tmp/requirements-dev.txt
+RUN pip install -r /tmp/requirements-dev.txt && \
+    rm /tmp/requirements-dev.txt

.devcontainer/devcontainer.json

@@ -0,0 +1,6 @@
+{
+    "build": {
+        "dockerfile": "Dockerfile",
+        "context": ".."
+    }
+}

sievelib/managesieve.py

@@ -178,7 +178,7 @@ def __read_line(self) -> bytes:
         return ret
 
     def __read_response(self, nblines: int = -1) -> Tuple[bytes, bytes, bytes]:
-        """Read a response from the server.
+        r"""Read a response from the server.
 
         In the usual case, we read lines until we find one that looks
         like a response (OK|NO|BYE\s*(.+)?).
@@ -214,7 +214,7 @@ def __read_response(self, nblines: int = -1) -> Tuple[bytes, bytes, bytes]:
         return (code, data, resp)
 
     def __prepare_args(self, args: List[Any]) -> List[bytes]:
-        """Format command arguments before sending them.
+        r"""Format command arguments before sending them.
 
         Command arguments of type string must be quoted, the only
         exception concerns size indication (of the form {\d\+?}).
@@ -307,7 +307,7 @@ def __get_capabilities(self) -> bool:
         return True
 
     def __parse_error(self, text: bytes):
-        """Parse an error received from the server.
+        r"""Parse an error received from the server.
 
         if text corresponds to a size indication, we grab the
         remaining content from the server.

sievelib/parser.py

@@ -25,7 +25,7 @@ def __str__(self):
 
 
 class Lexer:
-    """
+    r"""
     The lexical analysis part.
 
     This class provides a simple way to define tokens (with patterns)