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App Inventor 2 文本代码块 · App Inventor 2 中文网

...文本中含有非数字内容,则赋值给数字后,数字变量自动变成文本变量,后续的数字计算会报错! 案例:数字转文本 App Inventor 2 是弱语言类型,同理数字也能直接赋值给文本变量: 切换 目...
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C# Stream流使用总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...始化字节数组 file.Read(array, 0, array.Length);//读取流中数据它写到字节数组中 file.Close();//关闭流 string str = Encoding.Default.GetString(array);//将字节数组内容转化为字符串 Console.WriteLine(str); 将数据写入磁盘文件: FileStream file = Fil...
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Setting different color for each series in scatter plot on matplotlib

...in range(10)] colors = cm.rainbow(np.linspace(0, 1, len(ys))) for y, c in zip(ys, colors): plt.scatter(x, y, color=c) Or you can make your own colour cycler using itertools.cycle and specifying the colours you want to loop over, using next to get the one you want. For example, with 3 colours...
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How do you split a list into evenly sized chunks?

...old) Python documentation (recipes for itertools): from itertools import izip, chain, repeat def grouper(n, iterable, padvalue=None): "grouper(3, 'abcdefg', 'x') --> ('a','b','c'), ('d','e','f'), ('g','x','x')" return izip(*[chain(iterable, repeat(padvalue, n-1))]*n) The current versi...
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各编程语言读写文件汇总 - C/C++ - 清泛网 - 专注C/C++及内核技术

...]) { // 获取文件的指针 FILE *fp = fopen("test.txt", "r"); // 指针移动到文件的结尾,使用ftell获取文件长度 fseek(fp, 0 ,SEEK_END); int len = ftell(fp); // 定义数组长度 char *pBuf = new char[len + 1]; // 指针移动到文件开头,因为我们...
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技术人员如何创业《二》- 合伙人的模式 - 资讯 - 清泛网 - 专注C/C++及内核技术

...过当最后成东青理解孟晓骏当年在美国的遭遇,并且悄悄之前孟晓骏待过的实验室以他的名字冠名,我当时就很羡慕这种共赴患难最后一起成功的兄弟是幸运和幸福的。说一下腾讯,他们几个合伙人从创办到2007年都是一直保...
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Passing parameters to a Bash function

...kies. :-) # $1 is the directory to archive # $2 is the name of the tar and zipped file when all is done. function backupWebRoot () { tar -cvf - $1 | zip -n .jpg:.gif:.png $2 - 2>> $errorlog && echo -e "\nTarball created!\n" } # sh style declaration for the purist in you. ...
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Understanding the map function

...oop ys = [] for x in xs: ys.append(x * 2) n-ary map is equivalent to zipping input iterables together and then applying the transformation function on every element of that intermediate zipped list. It's not a Cartesian product: xs = [1, 2, 3] ys = [2, 4, 6] def f(x, y): return (x * 2, y...
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阿里的线下野心 - 资讯 - 清泛网 - 专注C/C++及内核技术

阿里的线下野心线上零售的头交椅,显然不能满足阿里帝国的野心,马云的生态圈也加速向地面蔓延。日前,阿里旗下实体商业O2O平台喵街宣布与银泰、王府井 线上零售的头交椅,显然不能满足阿里帝国的野心,马云的...
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写出高质量代码的10个Tips - 更多技术 - 清泛网 - 专注C/C++及内核技术

...重构对于代码质量的重要性不言而喻,反正我是很难一次代码写得让自己满意、无可挑剔,《重构》这本书作为业内经典也理应人人必读,也有其他类似的教授重构技巧的书,有些也非常不错,遗憾的是我发现很多工作多年的...