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简单的‘Hello World!’
Python命令行
假设你已经安装好了Python, 那么在Linux命令行输入:
$python
将直接进入python。然后在命令行提示符>>>后面输入:
>>>print('Hello World!')
可以看到，随后在屏幕上输出:
Hello World!
print是一个常用函数，其功能就是输出括号中得字符串。
（在Python 2.x中，print还可以是一个关键字，可写成print 'Hello World!'，但这在3.x中行不通 ）
写一段小程序
另一个使用Python的方法，是写一个Python程序。用文本编辑器写一个.py结尾的文件，比如说hello.py
在hello.py中写入如下，并保存:
print('Hello World!')
退出文本编辑器，然后在命令行输入:
$python hello.py
来运行hello.py。可以看到Python随后输出
Hello World!
脚本
我们还可以把Python程序hello.py改成一个可执行的脚本，直接执行：
#!/usr/bin/env python print('Hello World!')
需要修改上面程序的权限为可执行：
chmod 755 hello.py
然后再命令行中，输入
./hello.py
就可以直接运行了
总结
命令行模式: 运行Python，在命令行输入命令并执行。
程序模式: 写一段Python程序并运行。
如果你喜欢这篇文章，欢迎推荐。
技术推动进步，分享促进社区。
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<div class="postDesc">posted @ <span id="post-date">2012-05-28 17:23</span> <a href="http://www.cnblogs.com/vamei/">Vamei</a> 阅读(<span id="post_view_count">197235</span>) 评论(<span id="post_comment_count">30</span>) <a href="https://i.cnblogs.com/EditPosts.aspx?postid=2521650" rel="nofollow">编辑</a> <a href="#" onclick="AddToWz(2521650);return false;">收藏</a></div>
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<a href="#2574500" class="layer">#1楼</a><a name="2574500" id="comment_anchor_2574500"></a> <span class="comment_date">2012-12-10 21:00</span> <a id="a_comment_author_2574500" href="http://www.cnblogs.com/johnwonder/" target="_blank">john23.net</a> <a href="http://msg.cnblogs.com/send/john23.net" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_2574500" class="blog_comment_body">感谢分享</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(2574500,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(2574500,'Bury',this)">反对(0)</a></div><span id="comment_2574500_avatar" style="display:none;">http://pic.cnblogs.com/face/u64521.jpg</span>
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<a href="#2604709" class="layer">#2楼</a><a name="2604709" id="comment_anchor_2604709"></a> <span class="comment_date">2013-01-22 08:59</span> <a id="a_comment_author_2604709" href="http://home.cnblogs.com/u/487926/" target="_blank">韵味</a> <a href="http://msg.cnblogs.com/send/%E9%9F%B5%E5%91%B3" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_2604709" class="blog_comment_body">hi，博主，想问下您，通常都用什么工具编写python，Vim或IDIE或Eclipse 还是其他的，那个方便点。</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(2604709,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(2604709,'Bury',this)">反对(0)</a></div>
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<a href="#2604727" class="layer">#3楼</a><a name="2604727" id="comment_anchor_2604727"></a>[<span class="louzhu">楼主</span>] <span class="comment_date">2013-01-22 09:14</span> <a id="a_comment_author_2604727" href="http://www.cnblogs.com/vamei/" target="_blank">Vamei</a> <a href="http://msg.cnblogs.com/send/Vamei" title="发送站内短消息" class="sendMsg2This"> </a>
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韵味
我用过vim和idle，现在主要是vim。
我觉得vim就挺方便的，用多了的原因。
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<a href="#2687001" class="layer">#4楼</a><a name="2687001" id="comment_anchor_2687001"></a> <span class="comment_date">2013-05-22 15:20</span> <a id="a_comment_author_2687001" href="http://home.cnblogs.com/u/472784/" target="_blank">nsdont</a> <a href="http://msg.cnblogs.com/send/nsdont" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_2687001" class="blog_comment_body">博主，你用vim写python时， 有用到什么插件没，求推荐，求指导</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(2687001,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(2687001,'Bury',this)">反对(0)</a></div>
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<a href="#2687089" class="layer">#5楼</a><a name="2687089" id="comment_anchor_2687089"></a>[<span class="louzhu">楼主</span>] <span class="comment_date">2013-05-22 16:37</span> <a id="a_comment_author_2687089" href="http://www.cnblogs.com/vamei/" target="_blank">Vamei</a> <a href="http://msg.cnblogs.com/send/Vamei" title="发送站内短消息" class="sendMsg2This"> </a>
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nsdont
没有…… vim有Python高亮，这就够了。
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<a href="#2687110" class="layer">#6楼</a><a name="2687110" id="comment_anchor_2687110"></a> <span class="comment_date">2013-05-22 16:52</span> <a id="a_comment_author_2687110" href="http://home.cnblogs.com/u/472784/" target="_blank">nsdont</a> <a href="http://msg.cnblogs.com/send/nsdont" title="发送站内短消息" class="sendMsg2This"> </a>
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Vamei
嗯，这就足以了，是我贪多了
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<a href="#2687208" class="layer">#7楼</a><a name="2687208" id="comment_anchor_2687208"></a>[<span class="louzhu">楼主</span>] <span class="comment_date">2013-05-22 18:10</span> <a id="a_comment_author_2687208" href="http://www.cnblogs.com/vamei/" target="_blank">Vamei</a> <a href="http://msg.cnblogs.com/send/Vamei" title="发送站内短消息" class="sendMsg2This"> </a>
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nsdont
我有点懒，总觉得够用就行。你可以探索一下插件。
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nsdont
ipython
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<a href="#2859972" class="layer">#9楼</a><a name="2859972" id="comment_anchor_2859972"></a> <span class="comment_date">2014-01-13 13:45</span> <a id="a_comment_author_2859972" href="http://home.cnblogs.com/u/595523/" target="_blank">lestatzb</a> <a href="http://msg.cnblogs.com/send/lestatzb" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_2859972" class="blog_comment_body">有微博orQQ吗？关注一下【我爱数据分析网】。我转载</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(2859972,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(2859972,'Bury',this)">反对(0)</a></div>
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<a href="#2917041" class="layer">#10楼</a><a name="2917041" id="comment_anchor_2917041"></a> <span class="comment_date">2014-04-14 09:08</span> <a id="a_comment_author_2917041" href="http://home.cnblogs.com/u/616161/" target="_blank">安静从容</a> <a href="http://msg.cnblogs.com/send/%E5%AE%89%E9%9D%99%E4%BB%8E%E5%AE%B9" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_2917041" class="blog_comment_body">我觉得这里应该补充上在编写脚本的格式注意事项<br><div class="cnblogs_Highlighter sh-gutter"><div><div id="highlighter_41881" class="syntaxhighlighter python"><div class="toolbar"><span><a href="#" class="toolbar_item command_help help">?</a></span></div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="python comments">#！/usr/bin/env python</code></div><div class="line number2 index1 alt1"><code class="python functions">print</code> <code class="python plain">‘hello world'</code></div></div></td></tr></tbody></table></div></div></div></div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(2917041,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(2917041,'Bury',this)">反对(0)</a></div>
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<a href="#2917121" class="layer">#11楼</a><a name="2917121" id="comment_anchor_2917121"></a>[<span class="louzhu">楼主</span>] <span class="comment_date">2014-04-14 10:10</span> <a id="a_comment_author_2917121" href="http://www.cnblogs.com/vamei/" target="_blank">Vamei</a> <a href="http://msg.cnblogs.com/send/Vamei" title="发送站内短消息" class="sendMsg2This"> </a>
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安静从容
有道理。我修改一下。
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<a href="#2921032" class="layer">#12楼</a><a name="2921032" id="comment_anchor_2921032"></a> <span class="comment_date">2014-04-19 07:07</span> <a id="a_comment_author_2921032" href="http://home.cnblogs.com/u/625495/" target="_blank">yato</a> <a href="http://msg.cnblogs.com/send/yato" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_2921032" class="blog_comment_body">楼主，请教下个简单的问题：写一段程序中“退出文本编辑器，然后在命令行输入:$python hello.py来运行hello.py。可以看到Python随后输出”------为什么我操作后提示$为invalid syntax. 一直不明白？求教</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(2921032,'Digg',this)">支持(2)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(2921032,'Bury',this)">反对(0)</a></div>
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<a href="#2921447" class="layer">#13楼</a><a name="2921447" id="comment_anchor_2921447"></a>[<span class="louzhu">楼主</span>] <span class="comment_date">2014-04-20 13:40</span> <a id="a_comment_author_2921447" href="http://www.cnblogs.com/vamei/" target="_blank">Vamei</a> <a href="http://msg.cnblogs.com/send/Vamei" title="发送站内短消息" class="sendMsg2This"> </a>
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yato
$是提示符，不用输入的。
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<a href="#2960169" class="layer">#14楼</a><a name="2960169" id="comment_anchor_2960169"></a> <span class="comment_date">2014-06-08 18:24</span> <a id="a_comment_author_2960169" href="http://home.cnblogs.com/u/640973/" target="_blank">madscientist</a> <a href="http://msg.cnblogs.com/send/madscientist" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_2960169" class="blog_comment_body">博主 如果是零基础学习Python 适合看你这个教程吗？还是有什么别的教程推荐呢？谢谢！</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(2960169,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(2960169,'Bury',this)">反对(0)</a></div>
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<a href="#2972358" class="layer">#15楼</a><a name="2972358" id="comment_anchor_2972358"></a> <span class="comment_date">2014-06-26 19:10</span> <a id="a_comment_author_2972358" href="http://home.cnblogs.com/u/645838/" target="_blank">Kay L</a> <a href="http://msg.cnblogs.com/send/Kay%20L" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_2972358" class="blog_comment_body">我装了一个Macvim，用的电脑是macbook，但是不知道怎么运行，好郁闷</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(2972358,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(2972358,'Bury',this)">反对(0)</a></div>
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<a href="#3089056" class="layer">#16楼</a><a name="3089056" id="comment_anchor_3089056"></a> <span class="comment_date">2014-12-18 15:27</span> <a id="a_comment_author_3089056" href="http://home.cnblogs.com/u/689007/" target="_blank">shanwl0919</a> <a href="http://msg.cnblogs.com/send/shanwl0919" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3089056" class="blog_comment_body">为什么我用python hello.py来运行，总是会报NameError: name 'python' is not defined错，这个是什么原因</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3089056,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3089056,'Bury',this)">反对(0)</a></div>
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<a href="#3118888" class="layer">#17楼</a><a name="3118888" id="comment_anchor_3118888"></a> <span class="comment_date">2015-01-29 16:10</span> <a id="a_comment_author_3118888" href="http://www.cnblogs.com/biang/" target="_blank">biangbiang</a> <a href="http://msg.cnblogs.com/send/biangbiang" title="发送站内短消息" class="sendMsg2This"> </a>
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电脑没装python吧？或者没配好环境变量。。
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<a href="#3132144" class="layer">#18楼</a><a name="3132144" id="comment_anchor_3132144"></a> <span class="comment_date">2015-02-27 10:19</span> <a id="a_comment_author_3132144" href="http://www.cnblogs.com/bxbz/" target="_blank">无言的蜗牛</a> <a href="http://msg.cnblogs.com/send/%E6%97%A0%E8%A8%80%E7%9A%84%E8%9C%97%E7%89%9B" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3132144" class="blog_comment_body">没找到有带页面的开发工具 感觉写的python只是一个很小的程序 很混乱</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3132144,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3132144,'Bury',this)">反对(0)</a></div>
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<a href="#3144919" class="layer">#19楼</a><a name="3144919" id="comment_anchor_3144919"></a> <span class="comment_date">2015-03-20 10:33</span> <a id="a_comment_author_3144919" href="http://home.cnblogs.com/u/620311/" target="_blank">快乐的昏析师</a> <a href="http://msg.cnblogs.com/send/%E5%BF%AB%E4%B9%90%E7%9A%84%E6%98%8F%E6%9E%90%E5%B8%88" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3144919" class="blog_comment_body">你好，请问给教程是否不适合windows 系统？如果不适合，有windows系统的教程吗？谢谢！</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3144919,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3144919,'Bury',this)">反对(0)</a></div>
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<a href="#3145262" class="layer">#20楼</a><a name="3145262" id="comment_anchor_3145262"></a> <span class="comment_date">2015-03-20 15:38</span> <a id="a_comment_author_3145262" href="http://www.cnblogs.com/sysman/" target="_blank">sysman</a> <a href="http://msg.cnblogs.com/send/sysman" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3145262" class="blog_comment_body">其实python源文件不必要py结尾的</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3145262,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3145262,'Bury',this)">反对(0)</a></div><span id="comment_3145262_avatar" style="display:none;">http://pic.cnblogs.com/face/508475/20130324103250.png</span>
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<a href="#3147895" class="layer">#21楼</a><a name="3147895" id="comment_anchor_3147895"></a> <span class="comment_date">2015-03-24 22:09</span> <a id="a_comment_author_3147895" href="http://home.cnblogs.com/u/721551/" target="_blank">liuhang</a> <a href="http://msg.cnblogs.com/send/liuhang" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3147895" class="blog_comment_body">直接看了</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3147895,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3147895,'Bury',this)">反对(0)</a></div>
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<a href="#3266689" class="layer">#22楼</a><a name="3266689" id="comment_anchor_3266689"></a> <span class="comment_date">2015-09-14 22:29</span> <a id="a_comment_author_3266689" href="http://www.cnblogs.com/yana/" target="_blank">yana789</a> <a href="http://msg.cnblogs.com/send/yana789" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3266689" class="blog_comment_body">windows下的python和linux下的python，安装后运行文本编辑的hello.py是一样吗？我是在windows下安装的python，在IDLE下运行￥python hello.py，提示syntaxerro。谢谢楼主解答</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3266689,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3266689,'Bury',this)">反对(0)</a></div>
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<a href="#3331599" class="layer">#23楼</a><a name="3331599" id="comment_anchor_3331599"></a> <span class="comment_date">2015-12-21 22:53</span> <a id="a_comment_author_3331599" href="http://www.cnblogs.com/liwei0526vip/" target="_blank">肖邦linux</a> <a href="http://msg.cnblogs.com/send/%E8%82%96%E9%82%A6linux" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3331599" class="blog_comment_body">强大的很，楼主的分享精神很值得赞一个。</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3331599,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3331599,'Bury',this)">反对(0)</a></div><span id="comment_3331599_avatar" style="display:none;">http://pic.cnblogs.com/face/781035/20180506171724.png</span>
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<a href="#3335456" class="layer">#24楼</a><a name="3335456" id="comment_anchor_3335456"></a> <span class="comment_date">2015-12-27 11:52</span> <a id="a_comment_author_3335456" href="http://www.cnblogs.com/myidea/" target="_blank">adacn</a> <a href="http://msg.cnblogs.com/send/adacn" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3335456" class="blog_comment_body">请问楼主是用什么软件写博客的？看起来很美观！我用的markdown。。。</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3335456,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3335456,'Bury',this)">反对(0)</a></div><span id="comment_3335456_avatar" style="display:none;">http://pic.cnblogs.com/face/814346/20151004154046.png</span>
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<a href="#3352630" class="layer">#25楼</a><a name="3352630" id="comment_anchor_3352630"></a> <span class="comment_date">2016-01-22 16:53</span> <a id="a_comment_author_3352630" href="http://www.cnblogs.com/yeayee/" target="_blank">yeayee</a> <a href="http://msg.cnblogs.com/send/yeayee" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3352630" class="blog_comment_body">第2课已巩固www.yeayee.com</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3352630,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3352630,'Bury',this)">反对(0)</a></div><span id="comment_3352630_avatar" style="display:none;">http://pic.cnblogs.com/face/816924/20170922082617.png</span>
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<a href="#3352633" class="layer">#26楼</a><a name="3352633" id="comment_anchor_3352633"></a> <span class="comment_date">2016-01-22 16:54</span> <a id="a_comment_author_3352633" href="http://www.cnblogs.com/yeayee/" target="_blank">yeayee</a> <a href="http://msg.cnblogs.com/send/yeayee" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3352633" class="blog_comment_body">第3课已巩固www.yeayee.com</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3352633,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3352633,'Bury',this)">反对(0)</a></div><span id="comment_3352633_avatar" style="display:none;">http://pic.cnblogs.com/face/816924/20170922082617.png</span>
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<a href="#3393352" class="layer">#27楼</a><a name="3393352" id="comment_anchor_3393352"></a> <span class="comment_date">2016-03-28 11:33</span> <a id="a_comment_author_3393352" href="http://home.cnblogs.com/u/922994/" target="_blank">wqh2016</a> <a href="http://msg.cnblogs.com/send/wqh2016" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3393352" class="blog_comment_body">很好 学习了 接着学了</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3393352,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3393352,'Bury',this)">反对(0)</a></div>
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<a href="#3450265" class="layer">#28楼</a><a name="3450265" id="comment_anchor_3450265"></a> <span class="comment_date">2016-06-12 11:08</span> <a id="a_comment_author_3450265" href="http://home.cnblogs.com/u/976061/" target="_blank">y1384444</a> <a href="http://msg.cnblogs.com/send/y1384444" title="发送站内短消息" class="sendMsg2This"> </a>
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Vamei
$是提示符，不用输入的。
但是IDLE上面输入的，提示符都是>>>，请问怎么操作才能执行文件或者脚本，谢谢
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<a href="#3508239" class="layer">#29楼</a><a name="3508239" id="comment_anchor_3508239"></a> <span class="comment_date">2016-09-12 01:52</span> <a id="a_comment_author_3508239" href="http://home.cnblogs.com/u/1025049/" target="_blank">liqYpil</a> <a href="http://msg.cnblogs.com/send/liqYpil" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3508239" class="blog_comment_body">@Vamei 作为一个从来没接触过编程的小白, 想问一下. 我当时用text document 写了 print("hello world") 但是无乱如何都打不开. 虽然很不好意思打扰你, 但的确是没有任何头绪.</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3508239,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3508239,'Bury',this)">反对(0)</a></div>
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<a href="#3804956" class="layer">#30楼</a><a name="3804956" id="comment_anchor_3804956"></a><span id="comment-maxId" style="display:none;">3804956</span><span id="comment-maxDate" style="display:none;">2017/10/9 9:58:40</span> <span class="comment_date">2017-10-09 09:58</span> <a id="a_comment_author_3804956" href="http://www.cnblogs.com/Wangr-G/" target="_blank">可爱小米兜</a> <a href="http://msg.cnblogs.com/send/%E5%8F%AF%E7%88%B1%E5%B0%8F%E7%B1%B3%E5%85%9C" title="发送站内短消息" class="sendMsg2This"> </a>
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<div id="comment_body_3804956" class="blog_comment_body">感谢楼主分享</div><div class="comment_vote"><a href="javascript:void(0);" class="comment_digg" onclick="return voteComment(3804956,'Digg',this)">支持(0)</a><a href="javascript:void(0);" class="comment_bury" onclick="return voteComment(3804956,'Bury',this)">反对(0)</a></div><span id="comment_3804956_avatar" style="display:none;">http://pic.cnblogs.com/face/1165029/20170512154616.png</span>
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