Instances of the Logger class represent a single logging channel. A "logging channel" indicates an area of an application. Exactly how an "area" is defined is up to the application developer. Since an application can have any number of areas, logging channels are identified by a unique string. Application areas can be nested (e.g. an area of "input processing" might include sub-areas "read CSV files", "read XLS files" and "read Gnumeric files"). To cater for this natural nesting, channel names are organized into a namespace hierarchy where levels are separated by periods, much like the Java or Python package namespace. So in the instance given above, channel names might be "input" for the upper level, and "input.csv", "input.xls" and "input.gnu" for the sub-levels. There is no arbitrary limit to the depth of nesting.
There are no implemented interfaces.
manager
(type: instance
)
<logging.Manager instance at 0x4047294c>
root
(type: instance
)
<logging.RootLogger instance at 0x4047266c>
addFilter(filter)
Add the specified filter to this handler.
addHandler(hdlr)
Add the specified handler to this logger.
callHandlers(record)
Pass a record to all relevant handlers.
Loop through all handlers for this logger and its parents in the logger hierarchy. If no handler was found, output a one-off error message to sys.stderr. Stop searching up the hierarchy whenever a logger with the "propagate" attribute set to zero is found - that will be the last logger whose handlers are called.
critical(msg, *args, **kwargs)
Log msg % args
with severity CRITICAL
.
To pass exception information, use the keyword argument exc_info with a true value, e.g.
logger.critical("Houston, we have a %s", "major disaster", exc_info=1)
debug(msg, *args, **kwargs)
Log msg % args
with severity DEBUG
.
To pass exception information, use the keyword argument exc_info with a true value, e.g.
logger.debug("Houston, we have a %s", "thorny problem", exc_info=1)
error(msg, *args, **kwargs)
Log msg % args
with severity ERROR
.
To pass exception information, use the keyword argument exc_info with a true value, e.g.
logger.error("Houston, we have a %s", "major problem", exc_info=1)
exception(msg, *args)
Convenience method for logging an ERROR with exception information.
fatal(msg, *args, **kwargs)
Log msg % args
with severity CRITICAL
.
To pass exception information, use the keyword argument exc_info with a true value, e.g.
logger.critical("Houston, we have a %s", "major disaster", exc_info=1)
filter(record)
Determine if a record is loggable by consulting all the filters.
The default is to allow the record to be logged; any filter can veto this and the record is then dropped. Returns a zero value if a record is to be dropped, else non-zero.
findCaller()
Find the stack frame of the caller so that we can note the source file name, line number and function name.
getEffectiveLevel()
Get the effective level for this logger.
Loop through this logger and its parents in the logger hierarchy, looking for a non-zero logging level. Return the first one found.
handle(record)
Call the handlers for the specified record.
This method is used for unpickled records received from a socket, as well as those created locally. Logger-level filtering is applied.
info(msg, *args, **kwargs)
Log msg % args
with severity INFO
.
To pass exception information, use the keyword argument exc_info with a true value, e.g.
logger.info("Houston, we have a %s", "interesting problem", exc_info=1)
isEnabledFor(level)
Is this logger enabled for level level
?
log(level, msg, *args, **kwargs)
Log msg % args
with the integer severity level
.
To pass exception information, use the keyword argument exc_info with a true value, e.g.
logger.log(level, "We have a %s", "mysterious problem", exc_info=1)
makeRecord(name, level, fn, lno, msg, args, exc_info)
A factory method which can be overridden in subclasses to create specialized LogRecords.
removeFilter(filter)
Remove the specified filter from this handler.
removeHandler(hdlr)
Remove the specified handler from this logger.
setLevel(level)
Set the logging level of this logger.
warn(msg, *args, **kwargs)
Log msg % args
with severity WARNING
.
To pass exception information, use the keyword argument exc_info with a true value, e.g.
logger.warning("Houston, we have a %s", "bit of a problem", exc_info=1)
warning(msg, *args, **kwargs)
Log msg % args
with severity WARNING
.
To pass exception information, use the keyword argument exc_info with a true value, e.g.
logger.warning("Houston, we have a %s", "bit of a problem", exc_info=1)