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Diffstat (limited to 'Doc/howto/logging-cookbook.rst')
| -rw-r--r-- | Doc/howto/logging-cookbook.rst | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/Doc/howto/logging-cookbook.rst b/Doc/howto/logging-cookbook.rst index aeaeba9..673b6b5 100644 --- a/Doc/howto/logging-cookbook.rst +++ b/Doc/howto/logging-cookbook.rst @@ -1595,7 +1595,7 @@ Implementing structured logging Although most logging messages are intended for reading by humans, and thus not readily machine-parseable, there might be cirumstances where you want to output messages in a structured format which *is* capable of being parsed by a program -(without needed complex regular expressions to parse the log message). This is +(without needing complex regular expressions to parse the log message). This is straightforward to achieve using the logging package. There are a number of ways in which this could be achieved, but the following is a simple approach which uses JSON to serialise the event in a machine-parseable manner:: @@ -1620,6 +1620,9 @@ If the above script is run, it prints:: message 1 >>> {"fnum": 123.456, "num": 123, "bar": "baz", "foo": "bar"} +Note that the order of items might be different according to the version of +Python used. + If you need more specialised processing, you can use a custom JSON encoder, as in the following complete example:: @@ -1628,6 +1631,7 @@ as in the following complete example:: import json import logging + # This next bit is to ensure the script runs unchanged on 2.x and 3.x try: unicode except NameError: @@ -1650,7 +1654,7 @@ as in the following complete example:: s = Encoder().encode(self.kwargs) return '%s >>> %s' % (self.message, s) - _ = StructuredMessage + _ = StructuredMessage # optional, to improve readability def main(): logging.basicConfig(level=logging.INFO, format='%(message)s') @@ -1663,3 +1667,6 @@ When the above script is run, it prints:: message 1 >>> {"snowman": "\u2603", "set_value": [1, 2, 3]} +Note that the order of items might be different according to the version of +Python used. + |