Using with logging

[asyncee]

Hi, very nice and beautiful package.

But how do i use it with logging?

For example, if i have a StreamLogger, should i write a custom formatter for it?

[tommikaikkonen]

I'm not very familiar with using pretty printers in a logging context, but here are my thoughts.

prettyprinter.pformat returns output as a string, which you could use for logging. This output will not be syntax highlighted. (You can output cpprint to a StringIO instance using the stream kwarg if you want a string with syntax highlighting.)

Now, if you want to have this kind of statement

logger.info('Value: %s', [1, 2, 3])

to use PrettyPrinter to render args like [1, 2, 3] above, looking at the logging module source, you would have to override LogRecord.getMessage(), so that you first call prettyprinter.pformat on each of the args before the logging module casts the args to strings with msg % args in LogRecord.getMessage. It seems like you could bypass the getMessage() call by writing a custom formatter (see this line), which might be easier.

Note that:

• PrettyPrinter will be slower than other printers, so if you do a lot of logging, it will affect application performance.
• Syntax highlighting is done using ANSI escape sequences. How it looks in your output will depend on where you view your logs.

[asyncee]

Great, thank you very much for detailed explanation!