twisted.logger.

Function	formatUnformattableEvent	Formats an event as a `unicode` that describes the event generically and a formatting error.
Class	CallMapping	Read-only mapping that turns a `()`-suffix in key names into an invocation of the key rather than a lookup of the key.
Function	formatWithCall	Format a string like `unicode.format`, but:
Function	_formatEvent	Formats an event as a `unicode`, using the format in `event["log_format"]`.
Function	_formatTraceback	No summary
Function	_formatSystem	No summary

def formatUnformattableEvent(event, error):

Formats an event as a unicode that describes the event generically and a formatting error.

Parameters	event	A logging event. (type: `dict`)
	error	The formatting error. (type: `Exception`)
Returns	A formatted string. (type: `unicode`)

def formatWithCall(formatString, mapping):

Format a string like unicode.format, but:

taking only a name mapping; no positional arguments
with the additional syntax that an empty set of parentheses correspond to a formatting item that should be called, and its result str'd, rather than calling str on the element directly as normal.

For example:

   >>> formatWithCall("{string}, {function()}.",
   ...                dict(string="just a string",
   ...                     function=lambda: "a function"))
   'just a string, a function.'

Parameters	formatString	A PEP-3101 format string. (type: `unicode`)
	mapping	A `dict`-like object to format.
Returns	The string with formatted values interpolated. (type: `unicode`)

def _formatEvent(event):

Formats an event as a unicode, using the format in event["log_format"].

This implementation should never raise an exception; if the formatting cannot be done, the returned string will describe the event generically so that a useful message is emitted regardless.

Parameters	event	A logging event. (type: `dict`)
Returns	A formatted string. (type: `unicode`)

def _formatTraceback(failure):

Format a failure traceback, assuming UTF-8 and using a replacement strategy for errors. Every effort is made to provide a usable traceback, but should not that not be possible, a message and the captured exception are logged.

Parameters	failure	The failure to retrieve a traceback from. (type: `twisted.python.failure.Failure`)
Returns	The formatted traceback. (type: `unicode`)

def _formatSystem(event):

Format the system specified in the event in the "log_system" key if set, otherwise the "log_namespace" and "log_level", joined by a u"#". Each defaults to u"-" is not set. If formatting fails completely, "UNFORMATTABLE" is returned.

Parameters	event	The event containing the system specification. (type: `dict`)
Returns	A formatted string representing the "log_system" key. (type: `unicode`)

twisted.logger._format module documentation

`twisted.logger._format` module documentation