【《人工智能实践教程》测评】分支与循环

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【《人工智能实践教程》测评】分支与循环 [复制链接]

# 【《人工智能实践教程》测评】分支与循环 官方配套视频教程 Bilibili 链接分享：[Python](https://www.bilibili.com/video/BV1RV4y1B7po?p=1&vd_source=311a862c74a77082f872d2e1ab5d1523) . 详见：[Gitee](https://gitee.com/shao1chuan/pythonbook) . <ignore_js_op> <img style="cursor:pointer;" id="aimg_864143" aid="864143" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/202411/23/012230qycinmbgatncc2tc.png" file="data/attachment/forum/202411/23/012230qycinmbgatncc2tc.png.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_864143_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>1.4.png</strong> <em class="xg1">(22.93 KB, 下载次数: 0)</em></p> <p> <a href="javascript:;" class="loginf" >下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_864143" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=864143&handlekey=savephoto_864143">保存到相册</a> </p> <p class="xg1 y"><span title="2024-11-23 01:22">17小时前</span> 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> ## 条件语句 if 语句基本形式 ```python if expression: if_suite ``` if-else 语句 ```python if expression: if_suite else: else_suite ``` if-elif-else 语句 ```python if expression1: if_suite elif expression2: elif_suite else: else_suite ``` 多个条件同时判断 ```python if_suite if expression1 else else_suite ``` ## 循环语句 ### for 循环 ``` for expression: suite_to_repeat ``` ### while 循环 ``` while expression: suite_to_repeat ``` while 循环 continue 和 break 指令 break 用于跳出本层循环，continue 用于跳出当次循环 **举例**：求和 1+2+3+···+100，当 sum 大于1000 时停止循环并输出 sum 值 ```python count = 1 sum = 0 while count <= 100: sum = sum + count if sum > 1000: break count = count + 1 print(sum) ``` 输出结果为 `1035` ### 嵌套循环 for 和 while 循环嵌套，for循环中嵌套 for 或 while 循环，while 循环中嵌套 for 或 while 循环 ```python for expression: while expression: statement(s) statement(s) ``` ## 随机数处理 导入工具包 random ```python import random ``` 语法：`random.randint(a, b)` 返回 [a,b] 区间的随机整数。