add loguru code examples

Author: adyouri

loguru/basic_logging.py

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+from loguru import logger
+
+logger.debug("Debug message")
+logger.info("Info message")
+logger.error("Error message")

loguru/context_logging.py

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+from loguru import logger
+import sys
+
+logger.remove()
+logger.add(sys.stderr, format="{time} | {level} | {message} | {extra}")
+
+user_logger = logger.bind(user_id="123")
+user_logger.info("User logged in")
+user_logger.info("User started a session")
+
+with logger.contextualize(request_id="abc789"):
+    logger.info("Processing request")
+    logger.info("Request completed")
+
+logger.info("Request is processed, this will not show extra context")

loguru/error_handling.py

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+import sys
+from loguru import logger
+
+logger.remove()
+logger.add(sys.stderr, format="{time} | {level} | {message} | {extra}", level="TRACE")
+
+@logger.catch
+def perform_action(user, action):
+    with logger.contextualize(user=user, action=action):
+        logger.trace("Starting action")
+        logger.info("Performing action")
+        if action not in ["login", "logout"]:
+            logger.trace("Invalid action detected")
+            raise ValueError("Invalid action")
+        logger.success("Action completed")
+
+perform_action("alice", "delete")

loguru/file_logging.py

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+from loguru import logger
+import time
+logger.add(sink="app.log", rotation="5 seconds", retention="1 minute")
+for i in range(100):
+   logger.info(f"Processing item #{i}")
+   time.sleep(2)

loguru/json_logging.py

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+import json
+from loguru import logger
+
+def simple_serializer(record):
+    subset = {
+        "time": record["time"].timestamp(),
+        "level": record["level"].name,
+        "message": record["message"],
+        "context": record["extra"]  # Include any bound context
+    }
+    return json.dumps(subset)
+
+def add_serialization(record):
+    record["extra"]["json_output"] = simple_serializer(record)
+
+logger.remove()
+
+logger = logger.patch(add_serialization)
+
+logger.add(
+    "simple_logs.json",
+    format="{extra[json_output]}"
+)
+
+logger.bind(user="john").info("User logged in")
+logger.bind(order_id="12345").info("Order processed")