{"id":5231,"date":"2023-05-30T12:17:44","date_gmt":"2023-05-30T12:17:44","guid":{"rendered":"https:\/\/middleware.io\/backend\/?p=5231"},"modified":"2023-06-22T11:19:53","modified_gmt":"2023-06-22T11:19:53","slug":"python-logging-best-practices","status":"publish","type":"post","link":"https:\/\/stage-site.middleware.io\/ja\/python-logging-best-practices\/","title":{"rendered":"12 Python Logging Best Practices To Debug Apps Faster"},"content":{"rendered":"\n

Despite its benefits, debugging is one of the most challenging aspects of application development. Logging is a viable tool in a developer’s arsenal for debugging. Python logging enables the generation of log messages of varying severity. This article is an in-depth overview of best practices and how <\/strong>to implement them for effective Python logging.<\/p>\n\n\n\n

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Table of Contents<\/div>\n
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The basics of logging in Python<\/h2>\n\n\n\n

Five terminologies bedrock logging in Python. The table below is an overview of each. <\/p>\n\n\n\n

Logger<\/td>The primary component of the Python logging module. It is responsible for emitting log messages to various handlers. You instantiate a logger object with a name and call methods to emit log messages of different severity levels.<\/td><\/tr>
Handler<\/td>Responsible for processing and emitting log messages received from a logger object. It determines how the log message is outputted.
 
The Python logging module has a set of handlers\u2014StreamHandler, FileHandler, SocketHandler, SMTPHandler, SysLogHandler, etc.<\/td><\/tr>
Formatter<\/td>Determines how the log message is formatted before the handler outputs it. It takes a message and formats it into a readable form, typically adding attributes such as the logger’s name, the log message’s severity level, the time the log message was created, and the message itself.<\/td><\/tr>
Level<\/td>Defines the severity of a log message and helps you identify the severity of a problem. Logging levels include Debug, Info, Warning, Error, and Critical. 

When a message is logged with a particular level, all messages of the same level or higher severities are recorded.

For example, if you log a message with the ERROR level, logs with the ERROR and CRITICAL levels are recorded.<\/td><\/tr>
Filter<\/td>An optional component controls which log messages are processed or emitted by a logger. It provides finer granularity by specifying the criteria of each log. <\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Understanding different logging levels<\/h2>\n\n\n\n

There are five levels of severity\u2014DEBUG, INFO, WARNING, ERROR, and CRITICAL. <\/p>\n\n\n\n

1. DEBUG<\/h3>\n\n\n\n

Debug is the lowest severity level and provides a detailed account of the application’s state and execution.<\/p>\n\n\n\n

2. INFO<\/h3>\n\n\n\n

This log level provides general information about the program, such as when it starts or stops.<\/p>\n\n\n\n

3. WARNING<\/h3>\n\n\n\n

This indicates that something unexpected happened, but the application can recover.<\/p>\n\n\n\n

4. ERROR<\/h3>\n\n\n\n

It indicates that the application encountered an error, which can potentially cause the application to fail.<\/p>\n\n\n\n

5. CRITICAL<\/h3>\n\n\n\n

This log level indicates that a critical error or failure occurred, which can cause the application to stop unexpectedly.<\/p>\n\n\n\n

Getting Started with Logging in Python<\/h2>\n\n\n\n

To monitor your Python application using Middleware, you must create an account<\/a>. <\/p>\n\n\n\n

Install the Middleware agent on your Python application using our easy one-step installation or one-step auto instrumentation commands provided in the system. For more about Middleware configuration, check our documentation<\/a>.<\/p>\n\n\n\n

Upon successful installation, the Python APM will add severity-based logging support and data export rules so that telemetry data can be forwarded to the Middleware Agent. <\/p>\n\n\n\n

To set up your application with Middleware’s Python APM for visualization, install the Python package by running the command below in your terminal:<\/p>\n\n\n\n

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\npip install <\/span> middleware-apm\n<\/code>\n<\/pre>\n<\/div>\n