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How can I check if a string represents an int, without using try/except?

...compile(r"^([+-]?[1-9]\d*|0)$") testvals = [ # integers 0, 1, -1, 1.0, -1.0, '0', '0.','0.0', '1', '-1', '+1', '1.0', '-1.0', '+1.0', '06', # non-integers 'abc 123', 1.1, -1.1, '1.1', '-1.1', '+1.1', '1.1.1', '1.1.0', '1.0.1', '1.0.0', '1.0.', '1..0', '1..', '0.0...
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How to check if a float value is a whole number

...value is a whole number, use the float.is_integer() method: >>> (1.0).is_integer() True >>> (1.555).is_integer() False The method was added to the float type in Python 2.6. Take into account that in Python 2, 1/3 is 0 (floor division for integer operands!), and that floating po...
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App Inventor 2开发计步器与定位器 - App Inventor 2 中文网 - 清泛IT论坛,有思想、有深度

...的简要规划): 图10-2 程序流程规划 三、组件设计基础(界面设计) 根据程序流程规划,创建一个比较简单的基础“健身宝”应用程序,一般只需要用到以下七种组件。 1、标签(步数、距离、计时、位置):一些标签用...
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How do I detect what .NET Framework versions and service packs are installed?

...-------------------------------------------------------------------------- 1.0 HKLM\Software\Microsoft\.NETFramework\Policy\v1.0\3705 1.1 HKLM\Software\Microsoft\NET Framework Setup\NDP\v1.1.4322\Install 2.0 HKLM\Software\Microsoft\NET Framework Setup\N...
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Discuz!x3.2微信登陆升级教程(接口错误(ERR05) 微社区域名已更换,请确保...

...05)微社区域名已更换,请确保接口已升级从即日起,打通微社区域名已经由原来的 wsq.discuz.qq.com 切换为 wsq.discuz.com...接口错误(ERR05) 微社区域名已更换,请确保接口已升级 从即日起,打通微社区域名已经由原来的 wsq....
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Get Slightly Lighter and Darker Color from UIColor

...ue:&b alpha:&a]) return [UIColor colorWithRed:MIN(r + 0.2, 1.0) green:MIN(g + 0.2, 1.0) blue:MIN(b + 0.2, 1.0) alpha:a]; return nil; } - (UIColor *)darkerColorForColor:(UIColor *)c { ...
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Does a valid XML file require an XML declaration?

...le using Sax Parser of Xerces. Is the XML declaration <?xml version="1.0" encoding="UTF-8"?> required? 3 Answers ...
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TortoiseSVN允许修改日志的方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...过服务端的hooks目录下的批处理使得SVN日志可修改。Windows:服务器端svn仓库hooks目录下加...SVN默认是不允许修改日志的,否则报错: 可以通过服务端的hooks目录下的批处理使得SVN日志可修改。 Windows: 服务器端svn仓库hoo...
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Why doesn't Python have a sign function?

...just use copysign and forget about it. >>> math.copysign(1, -4) -1.0 >>> math.copysign(1, 3) 1.0 If you get sick of passing two whole arguments, you can implement sign this way, and it will still be compatible with the IEEE stuff mentioned by others: >>> sign = functoo...
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上班狗来算算 你离财务自由还差多少钱? - 杂谈 - 清泛网 - 专注C/C++及内核技术

...需要15万以上的现金年收入,则需要150万的本金。 C)终极财务自由 这才是大BOSS~ 如果你想实现终极财务自由,这已经不是钱能计算出来的了,即便是胡润口中的1个亿,也不一定能让你达到终极财务自由。 财务自由的最...