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更新了11，12节
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‎11. useful tools/11.07 logging.ipynb

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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# logging 模块：记录日志"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"`logging` 模块可以用来记录日志："
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"import logging"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"`logging` 的日志类型有以下几种：\n",
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"\n",
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"- `logging.critical(msg)`\n",
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"- `logging.error(msg)`\n",
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"- `logging.warning(msg)`\n",
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"- `logging.info(msg)`\n",
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"- `logging.debug(msg)`\n",
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"\n",
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"级别排序为：`CRITICAL > ERROR > WARNING > INFO > DEBUG > NOTSET`\n",
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"\n",
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"默认情况下，`logging` 的日志级别为 `WARNING`，只有不低于 `WARNING` 级别的日志才会显示在命令行。"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"name": "stderr",
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"output_type": "stream",
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"text": [
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"CRITICAL:root:This is critical message\n",
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"ERROR:root:This is error message\n",
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"WARNING:root:This is warning message\n"
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]
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}
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],
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"source": [
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"logging.critical('This is critical message')\n",
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"logging.error('This is error message')\n",
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"logging.warning('This is warning message')\n",
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"\n",
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"# 不会显示\n",
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"logging.info('This is info message')\n",
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"logging.debug('This is debug message')"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"可以这样修改默认的日志级别："
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"name": "stderr",
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"output_type": "stream",
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"text": [
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"INFO:root:This is info message\n"
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]
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}
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],
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"source": [
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"logging.root.setLevel(level=logging.INFO)\n",
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"\n",
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"logging.info('This is info message')"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"可以通过 `logging.basicConfig()` 函数来改变默认的日志显示方式："
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"name": "stderr",
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"output_type": "stream",
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"text": [
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"CRITICAL:this program:This is critical message\n"
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]
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}
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],
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"source": [
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"logging.basicConfig(format='%(asctime)s: %(levelname)s: %(message)s')\n",
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"\n",
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"logger = logging.getLogger(\"this program\")\n",
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"\n",
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"logger.critical('This is critical message')"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 2",
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"language": "python",
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"name": "python2"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 2
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython2",
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"version": "2.7.6"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 0
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}

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