大约有 8,000 项符合查询结果(耗时:0.0256秒) [XML]

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Pandas - Get first row value of a given column

... I'm looping through a bunch of .csv files and reading the first value of a certain column in each. For some reason which I can't explain instead of returning the value this sometimes returns the index along with the value which messes up processing. I resor...
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Getting the location from an IP address [duplicate]

... I'm after and you can get it to return in multiple formats, json, xml and csv. $location = file_get_contents('http://freegeoip.net/json/'.$_SERVER['REMOTE_ADDR']); print_r($location); This will give you all of the things you could possibly want: { "ip": "77.99.179.98", "country_co...
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App开发如何更快捷? - 更多技术 - 清泛网 - 专注C/C++及内核技术

App开发如何更快捷?如今,专业的第三方服务App开发缩短了周期降低了成本,让App开发越来越简单快捷。APICloud 是中国领先的云端一体移动应用云服务提供商,...如今,专业的第三方服务App开发缩短了周期降低了成本,让App...
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appinventor2 视频播放器如何将媒体源设置指向流式视频的 URL? - App应...

问:appinventor2 视频播放器如何将媒体源设置指向流式视频的 URL? 答:目前原生组件“视频播放器”媒体源只能是.3gp和.mp4的本地文件,无法播放网络视频流。 不过,可以通过拓展实现播放网络流式视频,不仅如此拓展还提...
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如何让初始化全局变量自己输入的数值 - App Inventor 2 中文网 - 清泛IT...

如何让初始化全局变量自己输入的数值有几个注意点: 1、只让输入数字,用属性控制,用户无法输入数字之外的内容: 2、当输入内容发生变化,则将用户输入内容给全局变量: 3、除法一定要判断除数非零: 出现...
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error MSB6006: “cmd.exe”已退出,代码 3 - C++ UI - 清泛IT社区,创新赋能!

...ft.CppCommon.targets(151,5): error MSB6006: “cmd.exe”已退出,代码 3。 1> 1>生成失败 原因:一台电脑上使用cmake编译后拷贝到另一台电脑上,但是cmake的路径与原电脑不一致从而导致以上错误。 解决方法:新电脑上重新使用cm...
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AI伴侣现已正式升级“AppInventor学院”App! - App Inventor 2 中文网 -...

...即使如此,我们仍然决定启用我们自己独特的VI标识,因我们着眼于更长远的发展,意在打造中国特色版本的AppInventor2分支。 // 感谢 // 最后,感谢每一位会员的支持,你们的支持与期许是我们不断打磨产品的动力。我们...
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维护国家安全 中国限制出口无人机和高性能计算机 - 资讯 - 清泛网 - 专注...

维护国家安全 中国限制出口无人机和高性能计算机长期以来,欧美发达国家尤其是美国一直维持着高科技产品的对华出口禁令,尤其是近年来随着中国天河二号等超级计算机的崛起,美国又在高性能...长期以来,欧美发达国...
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Why are empty strings returned in split() results?

...isely maps the semantics of all kinds of delimiter-joined records (such as csv file lines [[net of quoting issues]], lines from /etc/group in Unix, and so on), it allows (as @Roman's answer mentioned) easy checks for (e.g.) absolute vs relative paths (in file paths and URLs), and so forth. Another ...
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Difference between \n and \r?

...ere still some applications using \r - e.g. MS Office 2011 Excel: Saving a CSV (with all default settings) - will save an ISO-8859-1 encoded file with \r-line endings. – CodeBrauer Jul 11 '17 at 12:48 ...