eval

make - define multiple variables in the same eval call

由 ↘锁芯ラ 提交于 2020-01-04 03:15:09
问题 I would like to use make 's eval function to define several (dynamically-named) variables inside a foreach , but I can't get eval to do this job. I tried something like this: $(eval \ var1 = val1 \ var2 = val2 \ ) It doesn't work: var1 gets defined as val1 var2 = val2 and var2 is not defined. It makes sense, because I put \ at the end of the second line. But if I remove it, the eval call will never be terminated. I tried different things to have this \ only seen by eval , but nothing did the

R: eval(parse()) error message: cannot open file even though “text=” is specified in parse

由 喜欢而已 提交于 2020-01-04 03:02:51
问题 I'm running analysis for a list of countries several times and during each iteration the result should be added to a vector. Below I show a simplified example without the loop for just one country. Even though I thoroughly looked for solutions, I could not find an answer. #this is my simplified country vector with just 1 country country<-c("Spain") #This is the vector that should hold the results of multiple iterations #for now, it contains only the result of the first iteration Spain

Can I get the Type() of a bound object in C#/WPF (even if the bound value is null)?

由 自闭症网瘾萝莉.ら 提交于 2020-01-03 20:58:11
问题 I have a binding to an unknown source. All I have is the binding. I have no other way of looking at the bound object. I need to figure out the Type for the bound object, even if the value is null (this is where my problem is). I was evaluating the binding by binding to an object and then using the object as a way to get the Type, but I need to know the type even if the value is null. For instance, I have a class like so: public class Customer{ public string Name { get; set; } public int Age {

react native create element with string

由 ＊爱你＆永不变心＊ 提交于 2020-01-03 13:04:12
问题 I see a lot people creating a route mapping in React native similar to the below: if (route.id === 'Blah') { return (<Blah prop1={this.method} prop2={this.other method} />); } else if (route.id === 'OtherView') { return (<OtherView prop1={this.method} />); } this can quickly become many lines of code, I'd like to do something like this: return (React.createElement(route.id, {propsToPass})); This doesn't work in React Native as apparently 'strings are not allowed as the first parameter in

Why do I need to localize $@ before using eval?

由 喜你入骨 提交于 2020-01-03 11:46:31
问题 I'm aware of the fact that $@ is a global variable, still I can't figure out why I need to localize it before using eval: For instance: eval { SOME_FUNC_THAT_MAY_DIE(); }; if ($@) { print "An error occured!\n"; } The only possible thing I can think of is, if some signal handler will call die at the same time I try to read $@ , what am I missing here? 回答1: The reason to say local $@ before calling eval is to avoid stepping on your caller's $@ . It's rude for a subroutine to alter any global

Python's eval() and globals()

由 怎甘沉沦 提交于 2020-01-03 08:34:13
问题 I'm trying to execute a number of functions using eval(), and I need to create some kind of environment for them to run. It is said in documentation that you can pass globals as a second parameter to eval(). But it seems to not work in my case. Here's the simpified example (I tried two approaches, declaring variable global and using globals(), and both do not work): File script.py : import test global test_variable test_variable = 'test_value' g = globals() g['test_variable'] = 'test_value'

Java - Evaluate String from String

由 心已入冬 提交于 2020-01-03 05:13:37
问题 in my Java code I have this snippet: String str = "\\u9601"; But I want it to be: String str = "\u9601"; which represents a wide character. Are there ways to do this? Please help. Thanks in advance. Supplementary: Sorry for the badly-described question. System.out.print("\u9601"); //this will display a Chinese character I am currently request a webpage(URL) which response with a JSON. If dumped to Console using "System.out.print", the JSON will turn out to be 6 visible characters \ , u , 9 ,

性能测试学习06_lr(完成业务流程脚本编写)

由 白昼怎懂夜的黑 提交于 2020-01-03 03:07:31
1、完成（注册，登录，重置支付密码，下订单，支付订单，获取订单列表） 2、下订单备注信息用中文（lr_convert_string_encoding）进行处理 3、web_convert_param对token进行URLcode 完整升级版接口编写 支付平台脚本的整体思路： 1.先编写注册脚本，关联注册成功返回token，关联注册成功返回的code，关联注册成功返回的手机号，判断是否注册成功； 2.登录，使用注册手机号及密码进行登录，关联登录成功返回的code,判断是否登录成功； 3.重置支付密码，重置密码需要使用md5加密，关联重置支付密码成功返回的code，判断是否重置成功； 1）使用md5加密方法，右键点击Extra_Files，选择添加脚本路径，找到md5.h文件，完成添加； 2）点击globals.h，添加引入的md5.h的文件； 3）使用方法：通过简单的test脚本进行练习 　　代码如下： Action() { lr_save_string(CMd5("12345"),"payPassword"); lr_output_message("本次运行结果%s:",lr_eval_string("{payPassword}")); return 0; ｝ 4.下订单操作，关联下订单返回的payId，关联下订单返回的code，判断是否下订单成功； 5.支付订单

第一个爬虫和测试

由 这一生的挚爱 提交于 2020-01-03 02:38:09
Python测试函数的方法之一是用：try……except def gameover(a,b): if a>=10 and b>=10 and abs(a-b)==2: return True if (a>=11 and b<11) or (a<11 and b>=11): return True return False try: a=gameover(10,11) print(a) except: print("Error") gameover测试的函数，没传参数的a,b，函数结果是True or False try：试着执行gameover()函数，正常就执行函数 except:否则 打印'Error' 这里用10，11这一对来测试，结果为： runfile('D:/新建文件夹/chesi.py', wdir='D:/新建文件夹') True 程序运行正常且结果正确 若不输入参数，结果应为Error,结果为： requests库是一个简洁且简单的处理HTTP请求的第三方库。 get()是对应与HTTP的GET方式，获取网页的最常用方法，可以增加timeout=n 参数，设定每次请求超时时间为n秒 text（）是HTTP相应内容的字符串形式，即url对应的网页内容 content（）是HTTP相应内容的二进制形式 用requests（）打开百度20次 from requests

$.getJSON的同步与异步请求

由 落花浮王杯 提交于 2020-01-02 23:24:53
$.getJSON是jQuery请求get服务的一种方式，请求成功后返回json数据。 请求格式为：$.getJSON(url,data,function(result){...}); url：请求路径； data：请求参数； function函数：请求成功后执行的代码。 *$.getJSON请求分 异步 和 同步 两种方式，需要区分不同的使用场景！！！ 1.$.getJSON异步请求（默认情况都是异步的）： $.getJSON("http://localhost/WCFService/FOnwipRes.svc/GetDMDXDeviceList", {"OrgId":118}, function(data){ var data = eval("(" + data + ")"); var DMDXData = eval("(" + data.Data + ")"); )}; 但是，有时候这种方式并不可行~~ 例如，在点击事件中，点击触发后发送请求，再把返回的数据进行处理。会出现请求未响应完成，后面的代码已经在对请求结果进行处理，出现对象未定义的异常。 代码演示： 弹出框使用的是 layer.js 来实现 //触发点击事件，弹出信息 function getDMDXInfo(e) { var DMDXDataNew = ""; //json返回数据 var DMDX =""; /
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