twisted.python.log : API documentation

Class	ILogContext	Actually, this interface is just a synonym for the dictionary interface, but it serves as a key for the default information in a log.
Interface	ILogObserver	An observer which can do something with log events.
Function	callWithContext	Undocumented
Function	callWithLogger	Utility method which wraps a function in a try:/except:, logs a failure if one occurrs, and uses the system's logPrefix.
Function	err	Write a failure to the log.
Class	Logger	This represents a class which may 'own' a log. Used by subclassing.
Class	LogPublisher	Class for singleton log message publishing.
Function	textFromEventDict	Extract text from an event dict passed to a log observer. If it cannot handle the dict, it returns None.
Class	FileLogObserver	Log observer that writes to a file-like object.
Class	PythonLoggingObserver	Output twisted messages to Python standard library `logging` module.
Class	StdioOnnaStick	Class that pretends to be stdout/err, and turns writes into log messages.
Function	startLogging	Initialize logging to a specified file.
Function	startLoggingWithObserver	Initialize logging to a specified observer. If setStdout is true (defaults to yes), also redirect sys.stdout and sys.stderr to the specified file.
Class	NullFile	Undocumented
Function	discardLogs	Throw away all logs.
Class	DefaultObserver	Default observer.
Function	_safeFormat	Try to format the string `fmtString` using `fmtDict` arguments, swallowing all errors to always return a string.

def callWithContext(ctx, func, *args, **kw): (source)

Undocumented

def callWithLogger(logger, func, *args, **kw): (source)

Utility method which wraps a function in a try:/except:, logs a failure if one occurrs, and uses the system's logPrefix.

def err(_stuff=None, _why=None, **kw): (source)

Write a failure to the log.

The _stuff and _why parameters use an underscore prefix to lessen the chance of colliding with a keyword argument the application wishes to pass. It is intended that they be supplied with arguments passed positionally, not by keyword.

Parameters	_stuff	The failure to log. If `_stuff` is `None` a new `Failure` will be created from the current exception state. If `_stuff` is an `Exception` instance it will be wrapped in a `Failure`. (type: `NoneType`, `Exception`, or `Failure`.)
	_why	The source of this failure. This will be logged along with `_stuff` and should describe the context in which the failure occurred. (type: `str`)

def _safeFormat(fmtString, fmtDict): (source)

Try to format the string fmtString using fmtDict arguments, swallowing all errors to always return a string.

def textFromEventDict(eventDict): (source)

Extract text from an event dict passed to a log observer. If it cannot handle the dict, it returns None.

The possible keys of eventDict are:

message: by default, it holds the final text. It's required, but can be empty if either isError or format is provided (the first having the priority).
isError: boolean indicating the nature of the event.
failure: failure.Failure instance, required if the event is an error.
why: if defined, used as header of the traceback in case of errors.
format: string format used in place of message to customize the event. It uses all keys present in eventDict to format the text.

Other keys will be used when applying the format, or ignored.

t.p.log : module documentation