{"id":135371,"date":"2024-09-06T11:43:06","date_gmt":"2024-09-06T06:13:06","guid":{"rendered":"https:\/\/www.vskills.in\/certification\/tutorial\/?page_id=135371"},"modified":"2024-09-06T11:43:07","modified_gmt":"2024-09-06T06:13:07","slug":"python-logging-filters-and-custom-filters","status":"publish","type":"page","link":"https:\/\/www.vskills.in\/certification\/tutorial\/python-logging-filters-and-custom-filters\/","title":{"rendered":"Python Logging: Filters and Custom Filters"},"content":{"rendered":"\n<p>In addition to loggers, handlers, and formatters, Python&#8217;s logging module provides filters that allow you to control which log messages are processed. Filters can be used to filter messages based on their level, the logger&#8217;s name, or other criteria.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Built-in Filters<\/strong><\/h2>\n\n\n\n<p>Python&#8217;s logging module includes several built-in filters:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Filter:<\/strong> The base class for custom filters.<\/li>\n\n\n\n<li><strong>LevelFilter:<\/strong> Filters messages based on their level.<\/li>\n\n\n\n<li><strong>BasicFilter:<\/strong> Filters messages based on the logger&#8217;s name.<\/li>\n<\/ul>\n\n\n\n<p><strong>Example:<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import logging\n\nlogger = logging.getLogger(__name__)\nlogger.setLevel(logging.DEBUG)\n\n# Create a filter to only log messages at the DEBUG level\nfilter = logging.Filter(name=\"app.module1\")\nlogger.addFilter(filter)\n\nlogger.debug(\"This message will be logged\")\nlogger.info(\"This message will not be logged\")\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Creating Custom Filters<\/strong><\/h2>\n\n\n\n<p>You can create custom filters by subclassing the <code class=\"\">Filter<\/code> class and implementing the <code class=\"\">filter(record)<\/code> method. This method should return <code class=\"\">True<\/code> if the record should be logged and <code class=\"\">False<\/code> otherwise.<\/p>\n\n\n\n<p><strong>Example:<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import logging\n\nclass CustomFilter(logging.Filter):\n    def filter(self, record):\n        return record.levelno &gt;= logging.WARNING\n\nlogger = logging.getLogger(__name__)\nlogger.addFilter(CustomFilter())\n\nlogger.debug(\"This message will not be logged\")\nlogger.warning(\"This message will be logged\")\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Using Filters with Handlers<\/strong><\/h2>\n\n\n\n<p>You can add filters to handlers to control which messages are processed by the handler.<\/p>\n\n\n\n<p><strong>Example:<\/strong><\/p>\n\n\n\n<p>Python<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>handler = logging.StreamHandler()\nhandler.addFilter(CustomFilter())\nlogger.addHandler(handler)\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>In addition to loggers, handlers, and formatters, Python&#8217;s logging module provides filters that allow you to control which log messages are processed. Filters can be used to filter messages based on their level, the logger&#8217;s name, or other criteria. Built-in Filters Python&#8217;s logging module includes several built-in filters: Example: Python Creating Custom Filters You can&#8230;<\/p>\n","protected":false},"author":16,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-135371","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python Logging: Filters and Custom Filters - Tutorial<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.vskills.in\/certification\/tutorial\/python-logging-filters-and-custom-filters\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python Logging: Filters and Custom Filters - Tutorial\" \/>\n<meta property=\"og:description\" content=\"In addition to loggers, handlers, and formatters, Python&#8217;s logging module provides filters that allow you to control which log messages are processed. 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