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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...				
				
				
							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);//读取流中数据把它写到字节数组中
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...				
				
				
							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...				
				
				
							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...				
				
				
							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");
	// 把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];
	// 把指针移动到文件开头,因为我们...				
				
				
							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,并且悄悄把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...				
				
				
							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. ...				
				
				
							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...				
				
				
							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把交椅,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   
线上零售的头把交椅,显然不能满足阿里帝国的野心,马云的...				
				
				
							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,反正我是很难一次把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...				
				
				
							