This page critical things the API reference information.
This module defines functions and classes which implement a flexible event logging system for applications and libraries. The key benefit of having the logging API provided by a standard library module is that all Python modules can participate in logging, so your application log can include your own messages integrated with messages from third-party modules. The module provides a lot of functionality and flexibility. The basic classes defined by the module, together with their functions, are listed below. Loggers expose the interface that application code directly uses.
Filters provide a finer grained facility for determining which log records to output. Formatters specify the layout of log records in the final output. Loggers have the following attributes and methods. Note that Loggers are never instantiated directly, but always through the module-level function logging. Loggers that are further down in the hierarchical list are children of loggers higher up in the list.
The logger name hierarchy is analogous to the Python package hierarchy, and identical to it if you organise your loggers on a per-module basis using the recommended construction logging. If this evaluates to false, logging messages are not passed to the handlers of ancestor loggers. If you attach a handler to a logger and critical things or more of its ancestors, it may emit the same record multiple times. A common scenario is to attach handlers only to the root logger, and to let propagation take care of the rest. Sets the threshold for this logger to level. NOTSET, its chain of ancestor loggers is traversed until either an ancestor with a level other than NOTSET is found, or the root is reached. If an ancestor is found with a level other than NOTSET, then that ancestor’s level is treated as the effective level of the logger where the ancestor search began, and is used to determine how a logging event is handled.
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If the root is reached, and it has a level of NOTSET, then all messages will be processed. Otherwise, the root’s level will be used as the effective level. Note, however, that levels are internally stored as integers, and methods such as e. Indicates if a message of severity lvl would be processed by this logger. This method checks first the module-level level set by logging. Indicates the effective level for this logger.
The value returned is an integer, typically one of logging. Returns a logger which is a descendant to this logger, as determined by the suffix. This is a convenience method, useful when the parent logger is named using e. The msg is the message format string, and the args are the arguments which are merged into msg using the string formatting operator. Note that this means that you can use keywords in the format string, together with a single dictionary argument.
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