eval

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a few dozen conditions (e.g., foo > bar ) that I need to evaluate on ~1MM rows of a DataFrame , and the most concise way of writing this is to store these conditions as a list of strings and create a DataFrame of boolean results (one row per record x one column per condition). (User input is not being evaluated.) In the quest for premature optimization, I am trying to determine whether I should write these conditions for evaluation within DataFrame (e.g., df.eval("foo > bar") or just leave it to python as in eval("df.foo > df.bar")

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I'm trying to run a tensorflow graph to train a model and periodically evaluate using a separate evaluation dataset. Both training and evaluation data is implemented using queue runners. My current solution is to create both inputs in the same graph and use a tf.cond dependent on an is_training placeholder. My issue is highlighted by the following code: import tensorflow as tf from tensorflow . models . image . cifar10 import cifar10 from time import time def get_train_inputs ( is_training ): return cifar10 . inputs ( False ) def

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am trying to consume a web service in VB6. The service - which I control - currently can return a SOAP/XML message or JSON. I am having a really difficult time figuring out if VB6's SOAP type (version 1) can handle a returned object - as opposed to simple types like string , int , etc. So far I cannot figure out what I need to do to get VB6 to play with returned objects. So I thought I might serialize the response in the web service as a JSON string. Does a JSON parser exist for VB6? 回答1: Check out JSON.org for an up-to-date list

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a string "{'datetime': datetime.datetime(2010, 11, 21, 0, 56, 58)}" and I want to convert this to the object it represents. Using ast.literal_eval() gives ValueError: malformed string; because it does not allow for construction of objects (i.e. the datetime call). Is there anyway to either get ast to process this correctly, or to secure eval to prevent code injection? 回答1: Following up on Ignacio Vazquez-Abrams' idea: import ast import datetime def parse_datetime_dict(astr,debug=False): try: tree=ast.parse(astr) except SyntaxError:

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm writing a basic Haskell interpreter and there is the following usecase: there are 2 variables, var1 and var2. if( (typeOf var1 is Integer) and (typeOf var2 is Integer) ) then var1 + var2; if( (typeOf var1 is String) and (typeOf var2 is String) ) then concatenate var1 to var2; How can I write it in Haskell? There's a part of the code: evaluate:: Expr -> Env -> Val evaluate expr env = trace("expr= " ++ (show expr) ++ "\n env= " ++ (show env)) $ case expr of Const v -> v lhs :+: rhs -> let valLhs = evaluate lhs env valRhs = evaluate rhs env

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Using NPOI , is there any buildin possibility to format a cell value (especially numeric and date values) as it has been formatted by Excel ? If not what would be the best way to implement it? I thought of a formatstring converter from Excel-formatstrings to C#-formatstrings? The following example assumes the Excel-formatstring and the C#-formatstring are the same. So it works for some basic formatstrings like: "#,##0.00" using NPOI.SS.UserModel; ICell cell = workbook.GetSheet("table1").GetRow(0).GetCell(0); string value = null; if(cell

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm using tf.estimator in TensorFlow 1.4 and tf.estimator.train_and_evaluate is great but I need early stopping. What's the prefered way of adding that? I assume there is some tf.train.SessionRunHook somewhere for this. I saw that there was an old contrib package with a ValidationMonitor that seemed to have early stopping, but it doesn't seem to be around anymore in 1.4. Or will the preferred way in the future be to rely on tf.keras (with which early stopping is really easy) instead of tf.estimator/tf.layers/tf.data , perhaps? 回答1: Good news

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: So I've run into this weird error in R. I have a simple function which returns an error term when comparing real and simulated prices, called hestondifferences() . when I try to find the local minima via: res<-optim(fn=hestondifferences, par = c(vT=vT, rho=rho, k=k, sigma=sigma)) I get the error message: Error in optim(fn = hestondifferences, par = c(vT = vT, rho = rho, k = k, : function cannot be evaluated at initial parameters What confuses me is that calling the function directly with the initial parameters hestondifferences(vT, rho, k,

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: My code to set a global variable using eval is not working. It's as if the assignment is not called at all, but no script errors occur. Click to see 'x' When the page loads, the alert shows what I expect; it confirms that x = 1. But after that, I click on the div and get a javascript error that x is undefined. How do I make eval add this variable properly? Background: The code above is a minimally reproducing example from a project I'm working on where we must execute javascript code during AJAX responses. eval works properly most of the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I need to scrape an xml file from http://feeds.feedburner.com/Torrentfreak for its links and description. I used this code : var webGet = new HtmlWeb(); var document = webGet.Load("http://feeds.feedburner.com/TechCrunch"); var TechCrunch = from info in document.DocumentNode.SelectNodes("//channel") from link in info.SelectNodes("//guid[@isPermaLink='false']") from content in info.SelectNodes("//description") select new { LinkURL = info.InnerText, Content = content.InnerText, }; lvLinks.DataSource = TechCrunch; lvLinks.DataBind(); I have used