Try using the [`HashSet&lt;T&gt;`][1] class.

Edit: I spent a long long time doing exactly what you did until I just stumbled on this class while reading a blog.


  [1]: http://msdn.microsoft.com/en-us/library/bb359438.aspx

I want to set something in the middle of the screen 

thanks



How to get the &#39;height&#39; of the screen using jquery

Ok so I need to download some web pages using Python and did a quick investigation of my options.

Included with Python:

[urllib][1] - seems to me that I should use urllib2 instead. urllib has no cookie support, HTTP/FTP/local files only (no SSL)

[urllib2][2] - complete HTTP/FTP client, supports most needed things like cookies, does not support all HTTP verbs (only GET and POST, no TRACE, etc.)

Full featured:

[mechanize][3] - can use/save Firefox/IE cookies, take actions like follow second link, actively maintained (0.2.5 released in March 2011)

[PycURL][4] - supports everything curl does (FTP, FTPS, HTTP, HTTPS, GOPHER, TELNET, DICT, FILE and LDAP), bad news: not updated since Sep 9, 2008 (7.19.0)

New possibilities:

[urllib3][5] - supports connection re-using/pooling and file posting

Deprecated (a.k.a. use urllib/urllib2 instead):

[httplib][6] - HTTP/HTTPS only (no FTP)

[httplib2][7] - HTTP/HTTPS only (no FTP)

The first thing that strikes me is that urllib/urllib2/PycURL/mechanize are all pretty mature solutions that work well. mechanize and PycURL ship with a number of Linux distributions (e.g. Fedora 13) and BSDs so installation is a non issue typically (so that&#39;s good). 

urllib2 looks good but I&#39;m wondering why PycURL and mechanize both seem very popular, is there something I am missing (i.e. if I use urllib2 will I paint myself in to a corner at some point?). I&#39;d really like some feedback on the pros/cons of these things so I can make the best choice for myself. 

Edit: added note on verb support in urllib2


  [1]: http://docs.python.org/library/urllib.html
  [2]: http://docs.python.org/library/urllib2.html
  [3]: http://wwwsearch.sourceforge.net/mechanize/
  [4]: http://pycurl.sourceforge.net/
  [5]: http://code.google.com/p/urllib3/
  [6]: http://docs.python.org/library/httplib.html
  [7]: http://code.google.com/p/httplib2/

Which is best in Python: urllib2, PycURL or mechanize?

I guess another way to phrase this would be &quot;Is there a class like `List&lt;&gt;` in C#, but optimized for checking whether a particular value is present?&quot; I&#39;m sure for a small set of values `List&lt;&gt;.Contains` would probably be fine, but what if I have a set of thousands or millions of values and wanted to find out whether a certain value was in it?

I&#39;ve implemented this kind of thing in the past by creating a `Dictionary&lt;object, int&gt;` and setting the value to 0 for every key, but this feels really clunky. And now there&#39;s Stack Overflow, where my stupid question can be transformed into education for thousands (dozens, even). So here it is!

I&#39;m not even sure what such a class would be called, other than maybe Set, so obviously searches on the topic have been... challenging :) 

Is there a class like Dictionary&lt;&gt; in C#, but for just keys, no values?

I guess another way to phrase this would be "Is there a class like <code>List&#x3C;></code> in C#, but optimized for checking whether a particular value is present?" I'm sure for a small set of values <code>List&#x3C;>.Contains</code> would probably be fine, but what if I have a set of thousands or millions of values and wanted to find out whether a certain value was in it?
I've implemented this kind of thing in the past by creating a <code>Dictionary&#x3C;object, int></code> and setting the value to 0 for every key, but this feels really clunky. And now there's Stack Overflow, where my stupid question can be transformed into education for thousands (dozens, even). So here it is!
I'm not even sure what such a class would be called, other than maybe Set, so obviously searches on the topic have been... challenging :)

Say I have an enum,

    public enum Colours
    {
        Red,
        Blue
    }

The only way I can see of parsing them is doing something like:

    string colour = &quot;Green&quot;;
    var col = (Colours)Enum.Parse(typeOf(Colours),colour);

This will throw a [System.ArgumentException][1] because &quot;Green&quot; is not a member of the `Colours` enum.

Now I really hate wrapping code in try/catch&#39;s, is there no neater way to do this that doesn&#39;t involve me iterating through each `Colours` enum, and doing a string comparison against `colour`?

  [1]: http://msdn.microsoft.com/en-us/library/system.argumentexception.aspx


Enum.Parse(), surely a neater way?

Using C# I was trying to develop the following two. The way I am doing it may have some problem and need your kind advice. In addition, I dont know whether there is any existing method to do the same.

    private static String HexConverter(System.Drawing.Color c)
    {
        String rtn = String.Empty;
        try
        {
            rtn = &quot;#&quot; + c.R.ToString(&quot;X2&quot;) + c.G.ToString(&quot;X2&quot;) + c.B.ToString(&quot;X2&quot;);
        }
        catch (Exception ex)
        {
            //doing nothing
        }

        return rtn;
    }

    private static String RGBConverter(System.Drawing.Color c)
    {
        String rtn = String.Empty;
        try
        {
            rtn = &quot;RGB(&quot; + c.R.ToString() + &quot;,&quot; + c.G.ToString() + &quot;,&quot; + c.B.ToString() + &quot;)&quot;;
        }
        catch (Exception ex)
        {
            //doing nothing
        }

        return rtn;
    }

Thanks.

Convert System.Drawing.Color to RGB and Hex Value

What is C# `internal` keyword equivalent in VB.NET?

What is C# &#39;internal&#39; in VB.net?

I am trying to read StartingMonthColumn and CategoryHeadingColumn
from the below app.config file using the code

    ConfigurationSettings.AppSettings[&quot;StartingMonthColumn&quot;]

but it is returning null, also ConfigurationSettings.AppSettings.Count returns zero

Please help me to read this in my windows application


    &lt;configuration&gt;
        &lt;configSections&gt;
            &lt;sectionGroup name=&quot;userSettings&quot; type=&quot;System.Configuration.UserSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089&quot; &gt;
                &lt;section name=&quot;CTARepository.Properties.Settings&quot; type=&quot;System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089&quot; allowExeDefinition=&quot;MachineToLocalUser&quot; requirePermission=&quot;false&quot; /&gt;
            &lt;/sectionGroup&gt;
        &lt;/configSections&gt;
        &lt;userSettings&gt;
            &lt;CTARepository.Properties.Settings&gt;
                &lt;setting name=&quot;Setting&quot; serializeAs=&quot;String&quot;&gt;
                    &lt;value /&gt;
                &lt;/setting&gt;
            &lt;/CTARepository.Properties.Settings&gt;
        &lt;/userSettings&gt;
        &lt;appSettings&gt;
            &lt;add key=&quot;StartingMonthColumn&quot; value=&quot;7&quot;/&gt;
            &lt;add key=&quot;CategoryHeadingColumn&quot; value=&quot;1&quot;/&gt;
        &lt;/appSettings&gt;
    &lt;/configuration&gt;

reading from app.config file

I have a to do this:

    AccountList.Split(vbCrLf)

In c# AccountList is a string.
How can i do?

thanks

equivalent of vbCrLf in c#

I have a dictionary as follows:

    {&#39;A&#39;:0,&#39;C&#39;:0,&#39;G&#39;:0,&#39;T&#39;:0}

I want to create an array with many dictionaries in it, as follows:

    [{&#39;A&#39;:0,&#39;C&#39;:0,&#39;G&#39;:0,&#39;T&#39;:0},{&#39;A&#39;:0,&#39;C&#39;:0,&#39;G&#39;:0,&#39;T&#39;:0},{&#39;A&#39;:0,&#39;C&#39;:0,&#39;G&#39;:0,&#39;T&#39;:0},...]

This is my code:

    weightMatrix = []
    for k in range(motifWidth):
        weightMatrix[k] = {&#39;A&#39;:0,&#39;C&#39;:0,&#39;G&#39;:0,&#39;T&#39;:0}

But of course it isn&#39;t working. Can someone give me a hint? Thanks. 



How can I create an array/list of dictionaries in python?

Question is simple:

I have two List&lt;String&gt;

    List&lt;String&gt; columnsOld = DBUtils.GetColumns(db, TableName);
    List&lt;String&gt; columnsNew = DBUtils.GetColumns(db, TableName);

And I need to get the intersection of these. Is there a quick way to achieve this?


Efficient intersection of two List&lt;String&gt; in Java?

Given a list of numbers, how does one find differences between every (`i`)-th elements and its (`i+1`)-th?

Is it better to use a `lambda` expression or maybe a list comprehension?

For example:  

Given a list `t=[1,3,6,...]`, the goal is to find a list `v=[2,3,...]` because `3-1=2`, `6-3=3`, etc.

Python: Finding differences between elements of a list

This is terribly ugly:

    psData = []
    nsData = []
    msData = []
    ckData = []
    mAData = []
    RData = []
    pData = []

Is there a way to declare these variables on a single line?

Python - Initializing Multiple Lists/Line

While other questions have tackled the broader category of [sequences][1] and [modules][2], I ask this very specific question:

**&quot;What naming convention do you use for dictionaries and why?&quot;**

Some naming convention samples I have been considering:

    # &#39;value&#39; is the data type stored in the map, while &#39;key&#39; is the type of key
    value_for_key={key1:value1, key2,value2}
    value_key={key1:value1, key2,value2}
    v_value_k_key={key1:value1, key2,value2}

Don&#39;t bother answering the &#39;why&#39; with &quot;because my work tells me to&quot;, not very helpful. The reason driving the choice is more important. Are there any other good considerations for a dictionary naming convention aside from readability?

**EDIT:**

**Chosen answer:** value_key_map

**Reason for chosen answer:** Allows a code reviewer to quickly and easily figure out the key and value for a map, and the fact that it is a map without looking anywhere else.


  [1]: https://stackoverflow.com/questions/659415/python-sequence-naming-convention
  [2]: https://stackoverflow.com/questions/711884/python-naming-conventions-for-modules

Python Naming Conventions for Dictionaries/Maps/Hashes

I&#39;d like to work with a dict in python, but limit the number of key/value pairs to X. In other words, if the dict is currently storing X key/value pairs and I perform an insertion, I would like one of the existing pairs to be dropped. It would be nice if it was the least recently inserted/accesses key but that&#39;s not completely necessary.

If this exists in the standard library please save me some time and point it out!

How to limit the size of a dictionary?

How do I get a Dictionary key by value in C#?

    Dictionary&lt;string, string&gt; types = new Dictionary&lt;string, string&gt;()
    {
        {&quot;1&quot;, &quot;one&quot;},
        {&quot;2&quot;, &quot;two&quot;},
        {&quot;3&quot;, &quot;three&quot;}
    };

I want something like this:

    getByValueKey(string value);

`getByValueKey(&quot;one&quot;)` must be return `&quot;1&quot;`.

What is the best way do this? Maybe HashTable or SortedLists?



Get dictionary key by value

I am looking for the best way to &quot;add&quot; multiple JavaScript objects (associative arrays).

For example, given:

    a = { &quot;one&quot; : 1, &quot;two&quot; : 2 };
    b = { &quot;three&quot; : 3 };
    c = { &quot;four&quot; : 4, &quot;five&quot; : 5 };

what is the best way to compute:

    { &quot;one&quot; : 1, &quot;two&quot; : 2, &quot;three&quot; : 3, &quot;four&quot; : 4, &quot;five&quot; : 5 }





How to concatenate properties from multiple JavaScript objects

I have an array created with this code:

    var widthRange = new Array();
    widthRange[46] = { min:0,  max:52 };
    widthRange[66] = { min:52, max:70 };
    widthRange[90] = { min:70, max:94 };

I want to get each of the values 46, 66, 90 in a loop. I tried `for (var key in widthRange)` but this gives me a whole bunch of extra properties (I assume they are functions on the object). I can&#39;t use a regular for loop since the values are not sequential.

How to iterate array keys in Javascript?

It appears they are both encryption algorithms that require public and private keys.  Why would I pick one versus the other to provide encryption in my client server application?

What is the difference between DSA and RSA?

HashMap allows one null key and any number of null values. What is the use of it?

What is the use of adding a null key or value to a HashMap in Java?

I would like to find the value in an array using the key.

Like this:

    $array=(&#39;us&#39;=&gt;&#39;United&#39;, &#39;ca&#39;=&gt;&#39;canada&#39;);
    $key=&#39;ca&#39;;
    

How can I have the value &#39;canada&#39;?

How to find array / dictionary value using key?

Let&#39;s say for example that I have some Android app that does X.  The free version has ads or basic features.  I want to have a paid version that removes the ads and adds extra features.

How can I use the paid app as a &quot;license key&quot; to unlock the features in the free app?

So the user would install the free app, then install the paid app to get the extra features, but they would still run the free app (which would now be unlocked).  What&#39;s the best approach to doing this?

Content Type	Original Author	Original Content on Stackoverflow
Question	Chuck Wilbur	View Question on Stackoverflow
Solution 1 - C#	Jake	View Answer on Stackoverflow

Is there a class like Dictionary<> in C#, but for just keys, no values?

C# Problem Overview

C# Solutions

Solution 1 - C#

Which is best in Python: urllib2, PycURL or mechanize?

How to get the 'height' of the screen using jquery

Attributions