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• Basic Python While loop compound conditional evaluation

  - by dbjohn

  In Python IDLE Shell it seems I cannot use a compound conditional expression and a while loop. I tried it within brackets too. k=0 m=0 while k<10 & m<10: print k k +=1 m+=1 If I write while k<10: print k k+=1 This does work. Is there a way I could achieve the first block of code with the "and" operator. I have done it in Java. Do I just need to put together "if" statements to achieve the same functionality in Python?

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• HTML / Conditional Comments - Do conditional comments behave as expected across browsers?

  - by John Himmelman

  Do conditional comments behave as expected across browsers? Can they cause rendering bugs or other issues? Are there any errors in the formatting/syntax of this CC? <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" width="718" height="227" id="swf"> <param name="movie" value="images/swf.swf" /> <!--[if !IE]>--> <object type="application/x-shockwave-flash" data="images/swf.swf" width="718" height="227"> <!--<![endif]--> <img src="images/alt.jpg" border="0" width="718" height="227"> <!--[if !IE]>--> </object> <!--<![endif]--> </object>

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• Conditional on WebClient

  - by CarryFlag

  Given: thin client (JS) model services client use services. services use model. Model consists of (for sample): Rect Circle ... Ellipse services: class CanvasProviger { public Canvas getCanvas() { return new Canvas(); } } model: class Canvas ... { private List < Figure > figures = new List < Figure >; ... } class Circle extends Figure { private int x, y, r; } class Rect extends Figure { private x, y, w, h; } client: ... var figure = MyJSRPCImpl.getCanvas().nextFigure(); if(figure == JSLocalModel.Rect) { drawRect(figure); } else if(figure == JSLocalModel.Circle) { drawCircle(figure); } ... How else can do way conditional? In rich client I used pattern Visitor. // my bad english, I know =(

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• Process results of conditional split in SSIS

  - by Robert

  I have a Data Flow Task and am connecting to a database via an OLE DB Source component to extract data. This data feeds into a Conditional Split component to separate the data based on a simple expression. After the evaluation of this expression, the data will end up in either of two locations: LocationA or LocationB. Alright, I have that all set up and working properly. Once the data is separated into these two locations, additional processing is to be done on the records. Here's where I am stuck: I need the the processing of records in LocationA to occur before the processing of records in LocationB. Is there a way to set precedence of which tasks occur before others? If not, what is the best way to handle this? I was thinking I may need to write the data in LocationA and LocationB back out to the database and create a new data flow task in the control flow to handle the order of which these records must be dealt with. Any help is greatly appreciated!

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• Conditional operator in Mako using Pylons

  - by Antoine Leclair

  In PHP, I often use the conditional operator to add an attribute to an html element if it applies to the element in question. For example: <select name="blah"> <option value="1"<?= $blah == 1 ? ' selected="selected"' : '' ?>> One </option> <option value="2"<?= $blah == 2 ? ' selected="selected"' : '' ?>> Two </option> </select> I'm starting a project with Pylons using Mako for the templating. How can I achieve something similar? Right now, I see two possibilities that are not ideal. Solution 1: <select name="blah"> % if blah == 1: <option value="1" selected="selected">One</option> % else: <option value="1">One</option> % endif % if blah == 2: <option value="2" selected="selected">Two</option> % else: <option value="2">Two</option> % endif </select> Solution 2: <select name="blah"> <option value="1" % if blah == 1: selected="selected" % endif >One</option> <option value="2" % if blah == 2: selected="selected" % endif >Two</option> </select> In this particular case, the value is equal to the variable tested (value="1" = blah == 1), but I use the same pattern in other situations, like <?= isset($variable) ? ' value="$variable" : '' ?>. I am looking for a clean way to achieve this using Mako.

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• Most readable way to write simple conditional check

  - by JRL

  What would be the most readable/best way to write a multiple conditional check such as shown below? Two possibilities that I could think of (this is Java but the language really doesn't matter here): Option 1: boolean c1 = passwordField.getPassword().length > 0; boolean c2 = !stationIDTextField.getText().trim().isEmpty(); boolean c3 = !userNameTextField.getText().trim().isEmpty(); if (c1 && c2 && c3) { okButton.setEnabled(true); } Option 2: if (passwordField.getPassword().length > 0 && !stationIDTextField.getText().trim().isEmpty() && !userNameTextField.getText().trim().isEmpty() { okButton.setEnabled(true); } What I don't like about option 2 is that the line wraps and then indentation becomes a pain. What I don't like about option 1 is that it creates variables for nothing and requires looking at two places. So what do you think? Any other options?

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• Regular Expressions Quick Reference

  - by Jan Goyvaerts

  The Regular-Expressions.info website has a new quick reference to regular expressions that lists all of the regex syntax in one single table along with a link to the tutorial section that explains the syntax. The quick reference is ordered by syntax whereas the full reference tables are ordered by feature. There are multiple entries for some of the syntax as different regex flavors may use the same syntax for different features. Use the quick reference if you’ve seen some syntax in somebody else’s regex and you have no idea what feature that syntax is for. Use the full reference tables if you already know the feature you want but forgot which syntax to use. Of course, an even quicker reference is to paste your regex into RegexBuddy, select the application you’re working with, and click on the part of the regex you don’t understand. RegexBuddy then selects the corresponding node in its regex tree which summarizes exactly what the syntax you clicked on does in your regex. If you need more information, press F1 or click the Explain Token button to open the relevant page in the regex tutorial in RegexBuddy’s help file.

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• Regular Expressions Cookbook Ebook Deal of the Day

  - by Jan Goyvaerts

  Every day O’Reilly has an “ebook deal of the day” offering one or a bunch of their books in electronic format for only $9.99. Twice this year I received an email from O’Reilly notifying me that Regular Expressions Cookbook was on sale. But each time the email was sent on the morning of the day itself. When it’s morning in California it’s already bedtime for me here in Thailand. So I never saw the emails until the next day, making it rather pointless to blog about the deal. But this time O’Reilly has listened to my request for advance notification. I just got an email this morning saying Regular Expressions Cookbook will be part of the Ebook Deal of the Day for 15 September 2010. That’s 15 September on the US west coast. When I write this there’s a few hours to go before the deal starts at one past midnight California time. You can get any O’Reilly Cookbook as an ebook for only $9.99. The normal price for Regular Expressons Cookbook as an ebook is $31.99. The download includes the book in PDF, ePub, Mobi (for Kindle), DAISY, and Android formats.

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• Multiple Conditions in Lambda Expressions at runtime C#

  - by Ryan

  Hi, I would like to know how to be able to make an Expression tree by inputting more than one parameter Example: dataContext.Users.Where(u => u.username == "Username" && u.password == "Password") At the moment the code that I did was the following but would like to make more general in regards whether the condition is OR or AND public Func<TLinqEntity, bool> ANDOnlyParams(string[] paramNames, object[] values) { List<ParameterExpression> paramList = new List<ParameterExpression>(); foreach (string param in paramNames) { paramList.Add(Expression.Parameter(typeof(TLinqEntity), param)); } List<LambdaExpression> lexList = new List<LambdaExpression>(); for (int i = 0; i < paramNames.Length; i++) { if (i == 0) { Expression bodyInner = Expression.Equal( Expression.Property( paramList[i], paramNames[i]), Expression.Constant(values[i])); lexList.Add(Expression.Lambda(bodyInner, paramList[i])); } else { Expression bodyOuter = Expression.And( Expression.Equal( Expression.Property( paramList[i], paramNames[i]), Expression.Constant(values[i])), Expression.Invoke(lexList[i - 1], paramList[i])); lexList.Add(Expression.Lambda(bodyOuter, paramList[i])); } } return ((Expression<Func<TLinqEntity, bool>>)lexList[lexList.Count - 1]).Compile(); } Thanks

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• PHP and regular expressions question?

  - by php

  What does the $/i mean in the following php code? preg_match ('/^[A-Z \'.-]{2,20}$/i')

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• Lighttpd Regular Expressions

  - by Kyle

  I am trying to match any url that has /images/ , /styles/ , or /scripts/ in a lighttpd $HTTP["url"] statement. How could this be done? I am currently using "^/images/" , etc. and it's only working if that directory is in the beginning of the URL.

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• System.Linq.Expressions.ExpressionVisitor is inaccessible due to its protection level

  - by tags2k

  I'm trying to follow the instructions on Creating an IQueryable LINQ Provider, but when I implement the classes which inherit from ExpressionVisitor as instructed I am told that ExpressionVisitor is inaccessible due to its protection level. Am I missing something incredibly basic?

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• Regular Expressions: Positive Lookahead and Word Border question

  - by Inf.S

  Hello again Stackoverflow people! Assume I have these words: smartphones, smartphone I want to match the substring "phone" from within them. However, in both case, I want only "phone" to be returned, not "phones" in the first case. In addition to this, I want matches only if the word "phone" is a suffix only, such that: fonephonetics (just an example) is not matched. I assumed that the regex (phone([?=s])?)\b would give me what I need, but it is currently matching "phones" and "phone", but not the "fonephonetics" one. I don't need "phones". I want "phone" for both cases. Any ideas about what is wrong, and what I can do? Thank you in advance!

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• Lambda Expressions and Stored Procedures

  - by Jason Summers

  Hi Everyone. I'm trying to mimic the LINQ Where extension method for my ADO.NET DAL methods. Bascially, my aim is to have a single method that I can call. Such as: Product p = Dal.GetProduct(x => x.ProductId == 32); Product p2 = Dal.GetProduct(x => x.ProductName.Contains("Soap")); I then want to dissect those Predicates and send the filter options to parameters in an ADO.NET Stored Procedure call. Any comments greatly appreciated.

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• Sort a List<T> using query expressions - LINQ C#

  - by Dan Yack

  I have a problem using Linq to order a structure like this : public class Person { public int ID { get; set; } public List<PersonAttribute> Attributes { get; set; } } public class PersonAttribute { public int ID { get; set; } public string Name { get; set; } public string Value { get; set; } } A person might go like this: PersonAttribute Age = new PersonAttribute { ID = 8, Name = "Age", Value = "32" }; PersonAttribute FirstName = new PersonAttribute { ID = 9, Name = "FirstName", Value = "Rebecca" }; PersonAttribute LastName = new PersonAttribute { ID = 10, Name = "LastName", Value = "Johnson" }; PersonAttribute Gender = new PersonAttribute { ID = 11, Name = "Gender", Value = "Female" }; I would like to use LINQ projection to sort a list of persons ascending by the person attribute of my choice, for example, sort on Age, or sort on FirstName. I am trying something like string mySortAttribute = "Age" PersonList.OrderBy(p => p.PersonAttribute.Find(s => s.Name == mySortAttribute).Value); But the syntax is failing me. Any clues? Thanks in advance!

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• Evaluating mathematical expressions in Python

  - by vander

  Hi, I want to tokenize a given mathematical expression into a binary tree like this: ((3 + 4 - 1) * 5 + 6 * -7) / 2 '/' / \ + 2 / \ * * / \ / \ - 5 6 -7 / \ + 1 / \ 3 4 Is there any pure Python way to do this? Like passing as a string to Python and then get back as a tree like mentioned above. Thanks.

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• Conversion of Linq expressions

  - by Arnis L.

  I'm not sure how exactly argument what I'm trying to achieve, therefore - wrote some code: public class Foo{ public Bar Bar{get;set;} } public class Bar{ public string Fizz{get;set;} } public class Facts{ [Fact] public void fact(){ Assert.Equal(expectedExp(),barToFoo(barExp())); } private Expression<Func<Foo,bool>> expectedExp(){ return f=>f.Bar.Fizz=="fizz"; } private Expression<Func<Bar,bool>> barExp(){ return b=>b.Fizz=="fizz"; } private Expression<Func<Foo,bool>> barToFoo (Expression<Func<Bar,bool>> barExp){ return Voodoo(barExp); //<-------------------------------------------??? } } Is this even possible?

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• Need help with this basic Contains<>() extension method and Lambda expressions

  - by Polaris878

  Hi, Say I have the following class: class Foo { // ctor etc here public string Bar { get; } } Now, I have a LinkedList of Foos declared like so: LinkedList<Foo> How would I write a basic Contains<() for this? I want to be able to do this: Foo foo = new Foo(someString); LinkedList<Foo> list = new LinkedList<foo>(); // Populate list with Foos bool contains = list.Contains<Foo>(foo, (x => foo.Bar == x.Bar)); Am I trying to do this correctly? Thanks

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• Replace conditional with polymorphism refactoring or similar?

  - by Anders Svensson

  Hi, I have tried to ask a variant of this question before. I got some helpful answers, but still nothing that felt quite right to me. It seems to me this shouldn't really be that hard a nut to crack, but I'm not able to find an elegant simple solution. (Here's my previous post, but please try to look at the problem stated here as procedural code first so as not to be influenced by the earlier explanation which seemed to lead to very complicated solutions: http://stackoverflow.com/questions/2772858/design-pattern-for-cost-calculator-app ) Basically, the problem is to create a calculator for hours needed for projects that can contain a number of services. In this case "writing" and "analysis". The hours are calculated differently for the different services: writing is calculated by multiplying a "per product" hour rate with the number of products, and the more products are included in the project, the lower the hour rate is, but the total number of hours is accumulated progressively (i.e. for a medium-sized project you take both the small range pricing and then add the medium range pricing up to the number of actual products). Whereas for analysis it's much simpler, it is just a bulk rate for each size range. How would you be able to refactor this into an elegant and preferably simple object-oriented version (please note that I would never write it like this in a purely procedural manner, this is just to show the problem in another way succinctly). I have been thinking in terms of factory, strategy and decorator patterns, but can't get any to work well. (I read Head First Design Patterns a while back, and both the decorator and factory patterns described have some similarities to this problem, but I have trouble seeing them as good solutions as stated there. The decorator example seems very complicated for just adding condiments, but maybe it could work better here, I don't know. And the factory pattern example with the pizza factory...well it just seems to create such a ridiculous explosion of classes, at least in their example. I have found good use for factory patterns before, but I can't see how I could use it here without getting a really complicated set of classes) The main goal would be to only have to change in one place (loose coupling etc) if I were to add a new parameter (say another size, like XSMALL, and/or another service, like "Administration"). Here's the procedural code example: public class Conditional { private int _numberOfManuals; private string _serviceType; private const int SMALL = 2; private const int MEDIUM = 8; public int GetHours() { if (_numberOfManuals <= SMALL) { if (_serviceType == "writing") return 30 * _numberOfManuals; if (_serviceType == "analysis") return 10; } else if (_numberOfManuals <= MEDIUM) { if (_serviceType == "writing") return (SMALL * 30) + (20 * _numberOfManuals - SMALL); if (_serviceType == "analysis") return 20; } else //i.e. LARGE { if (_serviceType == "writing") return (SMALL * 30) + (20 * (MEDIUM - SMALL)) + (10 * _numberOfManuals - MEDIUM); if (_serviceType == "analysis") return 30; } return 0; //Just a default fallback for this contrived example } } All replies are appreciated! I hope someone has a really elegant solution to this problem that I actually thought from the beginning would be really simple... Regards, Anders

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• Understanding Regular Expressions (focus on URL Rewrite)–Part 11 (Sub-Part 2 of 2)

  - by OWScott

  This 2nd part (out of 2) on Regular Expressions covers the remaining tips necessary to get up to speed on a topic that at first seems daunting, but really isn’t that bad. Whether you use Regular Expressions for URL Rewrite, Visual Studio, PowerShell, programming or any other tool, these tips will allow you to understand the essentials of Regular Expressions. Be sure to watch Part 1 first. This is week 11 of a 52 week series on various web administration related tasks. Past and future videos can be found here.

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• How to Highlight a Row in Excel Using Conditional Formatting

  - by Erez Zukerman

  Conditional formatting is an Excel feature you can use when you want to format cells based on their content. For example, you can have a cell turn red when it contains a number lower than 100. But how do you highlight an entire row? If you’ve never used Conditional Formatting before, you might want to look at Using Conditional Cell Formatting in Excel 2007. It’s one version back, but the interface really hasn’t changed much. But what if you wanted to highlight other cells based on a cell’s value? The screenshot above shows some codenames used for Ubuntu distributions. One of these is made up; when I entered “No” in the “Really” column, the entire row got different background and font colors. To see how this was done, read on.How To Make a Youtube Video Into an Animated GIFHTG Explains: What Are Character Encodings and How Do They Differ?How To Make Disposable Sleeves for Your In-Ear Monitors

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• Visual Studio 2010 Find and Replace With Regular Expressions

  - by Lance Robinson

  Here is a quick notes about using regular expressions in the VS2010 Find Replace dialog.  1.  To create a backreference, use curly braces (“{“ and “}” ) instead of regular parentheses. 2.  To use the captured backreference, use \1\2 etc, where \1 is the first captured value, \2 is the second captured value, etc. Example: I want to find*: info.setFieldValue(param1, param2); and replace it with: SetFieldValue(info, param1, param2); To do this, I can use the following find/replace values: Find what: {[a-zA-Z0-9]+}.setFieldValue\({[a-zA-Z0-9., ]+}\); Replace with: SetFieldValue(\1, \2); Use Regular Expressions is checked, of course. *If you’re wondering why I’d want to do this – because I don’t have control over the setFieldValue function – its in a third party library that doesn’t behave in a very friendly manner. Technorati Tags: Visual Studio,Regular Expressions

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• Executing a modified expression

  - by Sam

  I found this brief demo: http://msdn.microsoft.com/en-us/library/bb546136.aspx Which discusses modifying an expression. However the code starts with a Expression<Func<string, bool>> and ends up with a Expression so it's not complete. How do I take that expression and make it typed as Expression<Func<string,bool>> again? All the examples I have have found on executing an expression all involve dynamically created expressions which is not what this case has. Here the original expression is defined at compile time. And the code I want to write to do this won't know much about the expression, ideally as little as possible. I definately can't see how I would know what "Paramaters" to pass to Expression.LambdaExpression... In my particular case I want to search for any references to a particular propery of type A and swap them out with a reference to a property of type B then pass the expression to a call to IEnumerable.Where. ie. p=>p.Name == "Sam" where P is Foo1 becomes p=>p.FirstName == "Sam" where p is Foo2

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• Regular Expressions Cookbook Is in The Money—Win a Copy

  - by Jan Goyvaerts

  Regular Expressions Cookbook has sold enough copies to pay for the advance royalty Steven and I received. To celebrate we're giving away five copies of the book.

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• Regular Expressions Reference Tables Updated

  - by Jan Goyvaerts

  The regular expressions reference on the Regular-Expressions.info website was completely overhauled with the big update of that site last month. In the past, the reference section consisted of two parts. One part was a summary of the regex features commonly found in Perl-style regex flavors with short descriptions and examples. This part of the reference ignored differences between regex flavors and omitted most features that don’t have wide support. The other part was a regular expression flavor comparison that listed many more regex features along with YES/no indicators for many regex flavors, but without any explanations of the features. When reworking the site, I wanted to make the reference section more detailed, with descriptions and examples of all the syntax supported by the flavors discussed on the site. Doing that resulted in a reference that lists many features that are only supported by a few regex flavors. For such a reference to be usable, it needs to indicate which flavors support each feature. My original design for the new reference table used two rows for each feature. The first row had 4 columns with a label, syntax, description, and example, similar to the old reference tables. The second row had 20 columns indicating which versions of which flavors support these features. While the double-row design allowed all the information to fit within the table without requiring horizontal scrolling, it made it more difficult to quickly scan the tables for the feature you’re looking for. To make the new reference tables easier to read, they now have only a single row for each feature. The first 4 columns are the same as before. The remaining two columns show which versions of two regular expression flavors support the feature. You can use the drop-down lists above the table to choose the flavors the table should indicate. The site uses cookies to allow the flavor choices to persist while you navigate the reference. The result of this latest update is that the new regex tables are now just as easy to read as the ten-year-old tables on the old site were, while still covering all the features big and small of all the flavors discussed on the site.

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