Errors & debugging
Handle failures gracefully, raise helpful errors, and debug with confidence.
How to Log Errors with Structured Fields in Python
Logs error details as structured dictionary fields using Python's logging module with extra parameters.
import logging
import sys
def log_structured_error(operation: str, user_id: int, status_code: int, error_msg: str):
"""Log an error with structured fields using a dictionary."""
logger = logging.getLogger("structured_logger")
logger.setLevel(logging.ERROR)
# Create console handler if not already …How to attach a request ID to exception messages in Python
This code shows how to enrich exception messages with contextual request IDs using context variables, making error logs more traceable across concurrent requests.
import logging
from contextvars import ContextVar
request_id_var = ContextVar("request_id", default="unknown")
def add_request_id(exc: Exception) -> Exception:
exc.args = (f"request_id={request_id_var.get()} | {exc.args[0]}" if exc.args else f"request_id={request_id_var.get()}",) + exc.args[1:]
return exc
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Errors & debugging — Python code examples
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