eval

Is there a reference for data binding? I've seen a bunch of different ways to data bind things, but I've never found a reference. Is there one? I know there are Bind and Eval, but when does Container.DataItem come into play? Are there other "hidden" objects and methods available? Or is Container.DataItem the object that is being used here? Jeff Sternal when does Container.DataItem come into play? From the first link below (paraphrasing slightly): "Container.DataItem is a runtime alias for the DataItem for this specific item in a bound list." Are there other "hidden" objects and methods

Is vm.runInNewContext considered black magic like eval ? Is there a significant performance difference between require and reading a file and using vm to run it or is the the same under the hood (if you implemented caching etc and just wanted to add some variables to the context) Jan Jongboom runInNewContext is not meant to be used as a replacement of require or eval , but instead as a way to create a sandbox environment where you can safely run other scripts. Disadvantages are that it's slow (creation takes ~10 ms.) and takes up a couple megabytes. So no, don't use it as a require replacement

I am performing messaging via websockets between a HTML5 client and server running on node.js. Naturally I chose JSON as the message format and as such created common javascript code, defining the various message content types and transformation operations. The javascript code is shared between both projects. I created my web client as one git project and my server as another git project. Partly because I am using phonegap to build a webkit based client for various touch based environments. It's also a nice separation of the various logic. To share the common code I created a separate project

eval() 函数用来执行一个字符串表达式，并返回表达式的值。 即实现list，tuple，dict与str之间的转化。 语法 以下是 eval() 方法的语法: eval(expression[, globals[, locals]]) eval(expression, globals=None, locals=None) 参数 expression -- 表达式。 globals -- 变量作用域，全局命名空间，如果被提供，则必须是一个字典对象。 locals -- 变量作用域，局部命名空间，如果被提供，可以是任何映射对象。 globals和locals参数是可选的，如果提供了globals参数，那么它必须是dictionary类型；如果提供了locals参数，那么它可以是任意的map对象。 python的全局名字空间存储在一个叫globals()的dict对象中；局部名字空间存储在一个叫locals()的dict对象中。我们可以用print (locals())来查看该函数体内的所有变量名和变量值。 返回值 返回表达式计算结果。 实例 #返回表达式的值 >>> x = 7 >>> eval ( ' 3 * x ' ) 21 >>> eval ( ' pow(2,2) ' ) 4 >>> eval ( ' 2 + 2 ' ) 4 >>> n = 81 >>> eval ( "

Is it possible to do something like c = MyObj() c.eval("func1(42)+func2(24)") in Python..i.e. have func1() and func2() be evaluated within the scope of the object 'c' (if they were member functions within that class definition)? I can't do a simple parsing, since for my application the eval strings can become arbitrarily complicated. I guess doing some magic with the ast module might do the trick, but due to the dirth of literature on ast, I'm not sure where to look: import ast class MyTransformer(ast.NodeTransformer): def visit_Name(self, node): # do a generic_visit so that child nodes are

There are many questions on SO about using Python's eval on insecure strings (eg.: Security of Python's eval() on untrusted strings? , Python: make eval safe ). The unanimous answer is that this is a bad idea. However, I found little information on which strings can be considered safe (if any). Now I'm wondering if there is a definition of "safe strings" available (eg.: a string that only contains lower case ascii chars or any of the signs +-*/()). The exploits I found generally relied on either of _.,:[]'" or the like. Can such an approach be secure (for use in a graph painting web

　　这两天一直在研究数独，但是并没有研究透彻，由于时间的原因，暂时研究终止。期间一共写出了一个大方法，一个小方法。小方法还待优化。 注意一点：输入数据后，先执行一次"up"命令，更新一下每个棋盘格的可选数字，才可执行"m1"或"m2"的操作。 代码就如下所示： class shuDu: # 一道待解决的数独题 cBoard =[ [6,0,0,0,0,0,5,8,0], [5,2,0,9,0,0,6,0,0], [0,0,0,0,5,0,0,0,3], [2,0,0,8,3,0,0,0,0], [0,0,6,1,0,9,3,0,0], [0,0,0,0,7,6,0,0,9], [8,0,0,0,4,0,0,0,0], [0,0,2,0,0,5,0,1,7], [0,6,1,0,0,0,0,0,4] ] check = {} #可用数字字典 def refresh(self): print(self.cBoard) print("Refresh over") def show(self): print("==========================") for i in range(0,9): for j in range(0,9): num = ['-','-','-','-','-','-','-','-','-'] if((i,j) in self.check):