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wingfishwingfish
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2017.1.10 almost finish lesson 6
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‎python_basic/python_basic_lesson_06.ipynb‎

Lines changed: 135 additions & 23 deletions
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@@ -820,26 +820,48 @@
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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": null,
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"cell_type": "markdown",
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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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"---\n",
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"\n",
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"错误处理"
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"###错误处理\n",
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"\n",
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"异常即是一个事件，该事件会在程序执行过程中发生，影响了程序的正常执行。一般情况下，在Python无法正常处理程序时就会发生一个异常。异常是Python对象，表示一个错误。当Python脚本发生异常时我们需要捕获处理它，否则程序会终止执行。\n",
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"\n"
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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": null,
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"execution_count": 3,
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"metadata": {
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"collapsed": true
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"collapsed": false
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},
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"outputs": [],
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"a:a\n"
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]
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},
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{
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"ename": "ValueError",
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"evalue": "invalid literal for int() with base 10: 'a'",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mValueError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-3-ec14fac8152b>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0ma\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0minput\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'a:'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m 2\u001b[0m \u001b[0;32mif\u001b[0m \u001b[0ma\u001b[0m \u001b[0;34m==\u001b[0m\u001b[0;36m0\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 3\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"you cannot input 0\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 4\u001b[0m \u001b[0;32melse\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 5\u001b[0m \u001b[0mr\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m10\u001b[0m \u001b[0;34m/\u001b[0m \u001b[0ma\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
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"\u001b[0;31mValueError\u001b[0m: invalid literal for int() with base 10: 'a'"
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]
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}
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],
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"source": [
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"# 看似健壮的程序，输入字母会报错\n",
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"\n",
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"a = int(input('a:'))\n",
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"if a ==0:\n",
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" print(\"you cannot input 0\")\n",
@@ -850,12 +872,23 @@
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"execution_count": 5,
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"metadata": {
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"collapsed": true
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"collapsed": false
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},
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"outputs": [],
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"a:0\n",
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"except: division by zero\n"
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]
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}
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],
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"source": [
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"# 防止输入0作为除数\n",
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"\n",
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"a = int(input('a:'))\n",
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"try:\n",
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" r = 10 / a\n",
@@ -866,34 +899,53 @@
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"execution_count": 7,
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"metadata": {
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"collapsed": true
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"collapsed": false
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},
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"outputs": [],
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"a:1\n",
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"result: 10.0\n",
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"finish...\n"
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]
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}
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],
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"source": [
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"# try...except...finally\n",
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"\n",
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"a = int(input('a:'))\n",
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"dddd\n",
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"\n",
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"try:\n",
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" r = 10 / a\n",
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" print('result:', r)\n",
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"except ZeroDivisionError as e:\n",
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" print('except:', e)\n",
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"finally:\n",
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" print('finish...')\n",
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" \n",
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"fffff"
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" print('finish...')"
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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": null,
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"execution_count": 8,
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"metadata": {
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"collapsed": true
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"collapsed": false
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},
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"outputs": [],
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"except name 'c' is not defined\n"
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]
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}
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],
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"source": [
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"# 防止错误举例\n",
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"\n",
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"a = 100\n",
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"try:\n",
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" b = a + c \n",
@@ -904,12 +956,23 @@
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"execution_count": 9,
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"metadata": {
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"collapsed": true
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"collapsed": false
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},
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"outputs": [],
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"except: name 'c' is not defined\n",
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"100\n"
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]
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}
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],
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"source": [
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"# 防止错误举例，略完善的做法\n",
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"\n",
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"a = 100\n",
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"\n",
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"try:\n",
@@ -919,6 +982,55 @@
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" b = a + 0\n",
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"print(b)"
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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": 12,
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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": "stdout",
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"output_type": "stream",
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"text": [
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"a:a\n",
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"except: invalid literal for int() with base 10: 'a'\n",
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"result: 10.0\n",
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"finish...\n"
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]
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}
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],
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"source": [
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"# 对 int 进行判断\n",
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"\n",
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"a = input('a:')\n",
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"\n",
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"# 对输入值转换还有更完善的方法\n",
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"try:\n",
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" a = int(a)\n",
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"except ValueError as e:\n",
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" print('except:', e) \n",
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"finally:\n",
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" a = 1\n",
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"\n",
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"try:\n",
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" r = 10 / a\n",
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" print('result:', r)\n",
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"except ZeroDivisionError as e:\n",
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" print('except:', e)\n",
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"finally:\n",
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" print('finish...')"
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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": null,
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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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}
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],
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"metadata": {

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