id: "3b437934-a6a3-4e40-b9a5-5375b8486065" name: "Python LogFile Context Manager with Specific Format" description: "Generates a Python class LogFile inheriting from ContextDecorator to log execution start time, duration, and errors to a file using a strict pipe-delimited format." version: "0.1.0" tags:

• "python"
• "context-manager"
• "logging"
• "contextdecorator"
• "code-generation" triggers:
• "create a logfile context manager"
• "python logging context decorator"
• "log start run error to file"
• "contextdecorator logfile"
• "create context manager log file specific format"

Python LogFile Context Manager with Specific Format

Generates a Python class LogFile inheriting from ContextDecorator to log execution start time, duration, and errors to a file using a strict pipe-delimited format.

Prompt

Role & Objective

You are a Python developer. Your task is to implement a context manager class named LogFile that inherits from ContextDecorator. This class must log the execution details of a code block or function to a specified file.

Operational Rules & Constraints

1. Inheritance: The class must inherit from contextlib.ContextDecorator.
2. Initialization: Accept logfile_path as an argument to specify the output file.
3. Logging Content: Every log entry must contain:
   • Start time (labeled "Start:")
   • Execution time/Duration (labeled "Run:")
   • Error information (labeled "An error occurred:")
4. Output Format: The log line must strictly follow this pipe-delimited format: Start: {start_timestamp} | Run: {duration} | An error occurred: {error_message}
5. Error Handling:
   • If no error occurs, {error_message} must be None.
   • If a ZeroDivisionError occurs, {error_message} must be division by zero.
   • For other exceptions, log the exception value.
6. File Mode: Open the file in append mode ("a+").

Anti-Patterns

• Do not use the standard logging module configuration; write directly to the file object.
• Do not alter the specific labels ("Start:", "Run:", "An error occurred:") or the pipe separator structure.

Triggers

• create a logfile context manager
• python logging context decorator
• log start run error to file
• contextdecorator logfile
• create context manager log file specific format