projects / OpenSPARC-T2-SAM / blame
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| 55 | <H2><A NAME="SECTION0082930000000000000000"></A><A NAME="multiple-destinations"></A> | |
| 56 | <BR> | |
| 57 | 6.29.3 Logging to multiple destinations | |
| 58 | </H2> | |
| 59 | ||
| 60 | <P> | |
| 61 | Let's say you want to log to console and file with different message formats | |
| 62 | and in differing circumstances. Say you want to log messages with levels | |
| 63 | of DEBUG and higher to file, and those messages at level INFO and higher to | |
| 64 | the console. Let's also assume that the file should contain timestamps, but | |
| 65 | the console messages should not. Here's how you can achieve this: | |
| 66 | ||
| 67 | <P> | |
| 68 | <div class="verbatim"><pre> | |
| 69 | import logging | |
| 70 | ||
| 71 | # set up logging to file - see previous section for more details | |
| 72 | logging.basicConfig(level=logging.DEBUG, | |
| 73 | format='%(asctime)s %(name)-12s %(levelname)-8s %(message)s', | |
| 74 | datefmt='%m-%d %H:%M', | |
| 75 | filename='/temp/myapp.log', | |
| 76 | filemode='w') | |
| 77 | # define a Handler which writes INFO messages or higher to the sys.stderr | |
| 78 | console = logging.StreamHandler() | |
| 79 | console.setLevel(logging.INFO) | |
| 80 | # set a format which is simpler for console use | |
| 81 | formatter = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s') | |
| 82 | # tell the handler to use this format | |
| 83 | console.setFormatter(formatter) | |
| 84 | # add the handler to the root logger | |
| 85 | logging.getLogger('').addHandler(console) | |
| 86 | ||
| 87 | # Now, we can log to the root logger, or any other logger. First the root... | |
| 88 | logging.info('Jackdaws love my big sphinx of quartz.') | |
| 89 | ||
| 90 | # Now, define a couple of other loggers which might represent areas in your | |
| 91 | # application: | |
| 92 | ||
| 93 | logger1 = logging.getLogger('myapp.area1') | |
| 94 | logger2 = logging.getLogger('myapp.area2') | |
| 95 | ||
| 96 | logger1.debug('Quick zephyrs blow, vexing daft Jim.') | |
| 97 | logger1.info('How quickly daft jumping zebras vex.') | |
| 98 | logger2.warning('Jail zesty vixen who grabbed pay from quack.') | |
| 99 | logger2.error('The five boxing wizards jump quickly.') | |
| 100 | </pre></div> | |
| 101 | ||
| 102 | <P> | |
| 103 | When you run this, on the console you will see | |
| 104 | ||
| 105 | <P> | |
| 106 | <div class="verbatim"><pre> | |
| 107 | root : INFO Jackdaws love my big sphinx of quartz. | |
| 108 | myapp.area1 : INFO How quickly daft jumping zebras vex. | |
| 109 | myapp.area2 : WARNING Jail zesty vixen who grabbed pay from quack. | |
| 110 | myapp.area2 : ERROR The five boxing wizards jump quickly. | |
| 111 | </pre></div> | |
| 112 | ||
| 113 | <P> | |
| 114 | and in the file you will see something like | |
| 115 | ||
| 116 | <P> | |
| 117 | <div class="verbatim"><pre> | |
| 118 | 10-22 22:19 root INFO Jackdaws love my big sphinx of quartz. | |
| 119 | 10-22 22:19 myapp.area1 DEBUG Quick zephyrs blow, vexing daft Jim. | |
| 120 | 10-22 22:19 myapp.area1 INFO How quickly daft jumping zebras vex. | |
| 121 | 10-22 22:19 myapp.area2 WARNING Jail zesty vixen who grabbed pay from quack. | |
| 122 | 10-22 22:19 myapp.area2 ERROR The five boxing wizards jump quickly. | |
| 123 | </pre></div> | |
| 124 | ||
| 125 | <P> | |
| 126 | As you can see, the DEBUG message only shows up in the file. The other | |
| 127 | messages are sent to both destinations. | |
| 128 | ||
| 129 | <P> | |
| 130 | This example uses console and file handlers, but you can use any number and | |
| 131 | combination of handlers you choose. | |
| 132 | ||
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| 169 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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