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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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  • Cancel Key press event

    - by Asim Sajjad
    How can I return the key, mean if I want to allow only interger value in the textbox , how can I don't allow user to not enter value other then integer, regarding, keypress event, I know there are other ways such as expression to match the string value, but I want to not assign invalid value to the textbox. if (( value 0 a&&(value <=9)) then assigned else return thanks in advance

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  • How do I get the length of a regex match in vim?

    - by misfo
    If I want to get the length of each match within the parentheses in the following regex, how do I do it?: ^\(\-\+\s\)\+ I'm trying to modify the width of columns in a buffer with data that is laid out as a table. Since the first two rows of the table will look like this DESIGN_ID DESIGN_YEAR SOURCE_REFERENCE ---------- ----------- ---------------- I want to use the regular expression to find the current width of each column.

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  • Changing namespace of Stream

    - by phenevo
    Hi, I've got asmx with method [Webmethod] public Ssytem.IO.Stream GetStream(string path) { ... } and winforms application which has webreference to this webservice. I cannot do something on my winforms application like something: var myStream= (System.IO.Stream)client.GetStream(path); because i Cannot cast expression "MyWinformsApp.MyService.Stream" to Stream. Why is that ?

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  • How can I recreate a SQL statement using NHibernate that has an inner select case?

    - by brianberns
    I am trying to recreate something like the following SQL using NHibernate criteria: select Range, count(*) from ( select case when ent.ID between 'A' and 'N' then 'A-M' else 'Other' end as Range from Subject ) tbl group by tbl.Range I am able to create the inner select as follows: session.CreateCriteria<Subject>() .SetProjection( Projections.Conditional( Expression.Between("Name", "A", "N"), Projections.Constant("A-M"), Projections.Constant("Other"))) .List(); However, I can't figure out how to pipe those results into a grouping by row count.

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  • Search for content in functions with regex

    - by Marlun
    Hello, How would I with regular expression search for functions which contains the use of a global variable without running "global $var" first? The files looks like this: class TestClass { function correctFunc() { global $var; $name = $var->name; } function invalidFuncIWantToFind() { $age = $var->user->age; } } I want to find the function names of all the invalidFuncIWantToFind. At work this would have really speeded up our work but I didn't get how to do it.

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  • Detecting that a MemberExpression has a value

    - by cs
    How do I detect if a MemberExpression has a value that needs to be compiled/evaluated? I have two separate member expression outputs, the first which has a value, and the second which doesn't. What is the best way to differentiate between the two? exp **{value(Microsoft.Connect.Api.Client.Tests.SearchQueryUnitTests+<>c__DisplayClass6).handle}** [System.Linq.Expressions.MemberExpression]: **{value(Microsoft.Connect.Api.Client.Tests.SearchQueryUnitTests+<>c__DisplayClass6).handle}** NodeType: MemberAccess Type: {Name = "String" FullName = "System.String"} vs exp {x.CreatedBy} [System.Linq.Expressions.MemberExpression]: {x.CreatedBy} NodeType: MemberAccess Type: {Name = "String" FullName = "System.String"}

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  • What does this regex do?

    - by Lizard
    ^.+\\(.*\\) I am struggling to work this one out, any help would be greatly appreciated... also is there a site that lets youu paste in a regular expression then spits out in plain text what it means?

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  • UNIX find for finding file names NOT ending in specific extensions?

    - by Cristi Diaconescu
    Is there a simple way to recursively find all files in a directory hierarchy, that do not end in a list of extensions? E.g. all files that are not *.dll or *.exe UNIX/GNU find, powerful as it is, doesn't seem to have an exclude mode (or I'm missing it), and I've always found it hard to use regular expressions to find things that don't match a particular expression. I'm in a Windows environment (using the GnuWin32 port of most GNU tools), so I'm equally open for Windows-only solutions.

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  • How to test when a feature was added to Perl?

    - by Eric Strom
    Are there any services similar to codepad that will allow you to test Perl constructs on old versions of perl? Ideally, a system where you could enter an expression and it will tell you the oldest version of perl that it will work with. Of course it's possible to use CPANTS for this, but that seems like an abuse of the service (if only for making the BackPan bigger). And it could take several days/weeks to get decent test coverage on old versions.

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  • How to exclude hidden row vaue from total value SSRS

    - by Annmarie
    I have an SSRS project and I want to exclude a row that I have hidden from the total. I have hidden the row based on an expression on the row visibility, where the row is hidden if: =IIF(IIF(ReportItems!CUST_CNT2.Value = 0, 0, ReportItems!Total_Contribution5.Value / IIF(ReportItems!CUST_CNT2.Value = 0, 1, ReportItems!CUST_CNT2.Value)) > 0, True, False) So basically the column totals for the report just total up all rows including this above row that I have hidden, and I need the total to exclude this row. Any ideas?

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  • Can a storyboard access the UserControl that it resides in?

    - by Jeremy
    I have a usercontrol, and I want a storyboard inside the user control to fade the user control out. Using Expression Blend, I can create the storyboard and cause it to fade the user control out, but when I run the silverlight application I get an error on FindControl stating that it can't find the control. I'm guessing the find control only searches the children of the parent, but does not look at the parent itself. Is there any way around this?

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  • match only extionless url

    - by user162428
    I want a regex expression which only match extionless url. In otherwords if a extion is present in url then completely ignore it. /(.+)/(.+) this will match both extionless and with extenion url i want to match only extionless URL www.site.com/sports/cricket should match www.site.com/sports/cricket.aspx shouldn't match Thanks in advance

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  • In MSAcess Database, Insert query to insert the character with apostrophe

    - by Suryakavitha
    In MSAcess Database Insert query to insert the character------ N'tetarnyl i have a insert query OleDbCommand cmd = new OleDbCommand("insert into checking values('" + dsGetData.Tables[0].Rows[i][0].ToString() + "','" + dsGetData.Tables[0].Rows[i][1].ToString()+ "')", con); but it is showing me error... syntax error (missing operator) in query expression any idea??? how to write insert query to insert the N'tetarnyl (including apostrophe)

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  • Parsing text file in python

    - by Ockonal
    Hello, I have html-file. I have to replace all text between this: [%anytext%]. As I understand, it's very easy to do with BeautifulSoup for parsing hmtl. But what is regular expression and how to remove&write back text data?

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  • Counting HTML images with Python

    - by user2537246
    I need some feedback on how to count HTML images with Python 3.01 after extracting them, maybe my regular expression are used properly. Here is my code: import re, os import urllib.request def get_image(url): url = 'http://www.google.com' total = 0 try: f = urllib.request.urlopen(url) for line in f.readline(): line = re.compile('<img.*?src="(.*?)">') if total > 0: x = line.count(total) total += x print('Images total:', total) except: pass

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  • XmlDocument filter nodes by datetime string

    - by Eatdoku
    Trying to apply filter / attribute comparison in the Xmldocument. Obviously , the following code snippet wouldn't work because the expression can't be converted using number() function. (according to the answer of my other question). I'm wondering if there is a way to do the DateTime string comparison in XmlDoc. XmlNodeList test = x2PathDoc.SelectNodes("//Config /Entity [@TargetDateTime> '2010-12-19T03:25:00-08:00']");

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  • Simplest way to flatten document to a view in RavenDB

    - by degorolls
    Given the following classes: public class Lookup { public string Code { get; set; } public string Name { get; set; } } public class DocA { public string Id { get; set; } public string Name { get; set; } public Lookup Currency { get; set; } } public class ViewA // Simply a flattened version of the doc { public string Id { get; set; } public string Name { get; set; } public string CurrencyName { get; set; } // View just gets the name of the currency } I can create an index that allows client to query the view as follows: public class A_View : AbstractIndexCreationTask<DocA, ViewA> { public A_View() { Map = docs => from doc in docs select new ViewA { Id = doc.Id, Name = doc.Name, CurrencyName = doc.Currency.Name }; Reduce = results => from result in results group on new ViewA { Id = result.Id, Name = result.Name, CurrencyName = result.CurrencyName } into g select new ViewA { Id = g.Key.Id, Name = g.Key.Name, CurrencyName = g.Key.CurrencyName }; } } This certainly works and produces the desired result of a view with the data transformed to the structure required at the client application. However, it is unworkably verbose, will be a maintenance nightmare and is probably fairly inefficient with all the redundant object construction. Is there a simpler way of creating an index with the required structure (ViewA) given a collection of documents (DocA)? FURTHER INFORMATION The issue appears to be that in order to have the index hold the data in the transformed structure (ViewA), we have to do a Reduce. It appears that a Reduce must have both a GROUP ON and a SELECT in order to work as expected so the following are not valid: INVALID REDUCE CLAUSE 1: Reduce = results => from result in results group on new ViewA { Id = result.Id, Name = result.Name, CurrencyName = result.CurrencyName } into g select g.Key; This produces: System.InvalidOperationException: Variable initializer select must have a lambda expression with an object create expression Clearly we need to have the 'select new'. INVALID REDUCE CLAUSE 2: Reduce = results => from result in results select new ViewA { Id = result.Id, Name = result.Name, CurrencyName = result.CurrencyName }; This prduces: System.InvalidCastException: Unable to cast object of type 'ICSharpCode.NRefactory.Ast.IdentifierExpression' to type 'ICSharpCode.NRefactory.Ast.InvocationExpression'. Clearly, we also need to have the 'group on new'. Thanks for any assistance you can provide. (Note: removing the type (ViewA) from the constructor calls has no effect on the above)

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  • Implement LINQ to Entities unsupported method

    - by Dan
    Hi! LINQ to Entities has many LINQ methods marked as "Unsupported" (http://msdn.microsoft.com/en-us/library/bb738550.aspx). Is any way to implement some of these methods by hands? Or I should wait next release of EF? I'm especially needing this method: IQueryable<TResult> Select<TSource, TResult>(this IQueryable<TSource> source, Expression<Func<TSource, int, TResult>> selector) Thanks

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