更新了11，12节

11. useful tools/11.07 logging.ipynb

@@ -0,0 +1,152 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# logging 模块：记录日志"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "`logging` 模块可以用来记录日志："
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "import logging"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "`logging` 的日志类型有以下几种：\n",
+    "\n",
+    "- `logging.critical(msg)`\n",
+    "- `logging.error(msg)`\n",
+    "- `logging.warning(msg)`\n",
+    "- `logging.info(msg)`\n",
+    "- `logging.debug(msg)`\n",
+    "\n",
+    "级别排序为：`CRITICAL > ERROR > WARNING > INFO > DEBUG > NOTSET`\n",
+    "\n",
+    "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。"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "CRITICAL:root:This is critical message\n",
+      "ERROR:root:This is error message\n",
+      "WARNING:root:This is warning message\n"
+     ]
+    }
+   ],
+   "source": [
+    "logging.critical('This is critical message')\n",
+    "logging.error('This is error message')\n",
+    "logging.warning('This is warning message')\n",
+    "\n",
+    "# 不会显示\n",
+    "logging.info('This is info message')\n",
+    "logging.debug('This is debug message')"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "可以这样修改默认的日志级别："
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "INFO:root:This is info message\n"
+     ]
+    }
+   ],
+   "source": [
+    "logging.root.setLevel(level=logging.INFO)\n",
+    "\n",
+    "logging.info('This is info message')"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "可以通过 `logging.basicConfig()` 函数来改变默认的日志显示方式："
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "CRITICAL:this program:This is critical message\n"
+     ]
+    }
+   ],
+   "source": [
+    "logging.basicConfig(format='%(asctime)s: %(levelname)s: %(message)s')\n",
+    "\n",
+    "logger = logging.getLogger(\"this program\")\n",
+    "\n",
+    "logger.critical('This is critical message')"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.6"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}