What to write into log file?

Question

My question is simple: what to write into a log. Are there any conventions? What do I have to put in?

Since my app has to be released, I\'d like to have friendly log

Answer 1

It's quite pleasant, and already implemented.

Read this: http://docs.python.org/library/logging.html

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Edit

"easy to parse, read," are generally contradictory features. English -- easy to read, hard to parse. XML -- easy to parse, hard to read. There is no format that achieves easy-to-read and easy-to-parse. Some log formats are "not horrible to read and not impossible to parse".

Some folks create multiple handlers so that one log has several formats: a summary for people to read and an XML version for automated parsing.