The leading `\x` escape sequence means the next two characters are interpreted as hex digits for the character code, so `\xaa` equals `chr(0xaa)`, i.e., `chr(16 * 10 + 10)` -- a small raised lowercase `&#39;a&#39;` character.

Escape sequences are documented in a short table [here][1] in the Python docs.


  [1]: https://docs.python.org/3/reference/lexical_analysis.html#string-and-bytes-literals

That&#39;s unicode character escaping. See &quot;Unicode Constructors&quot; on [PEP 100][1]


  [1]: http://www.python.org/dev/peps/pep-0100/

I am facing a serious issue with `sprintf`.

Suppose my code snippet is:

    sprintf(Buffer,&quot;Hello World&quot;);
    sprintf(Buffer,&quot;Good Morning&quot;);
    sprintf(Buffer,&quot;Good Afternoon&quot;);
    .
    .
    .
Some hundred sprints....

If I do like this, it&#39;s getting overwritten. 

How can I avoid overwriting using `sprintf`? If I give a `printf` at the end I want to see all the lines.

How to append strings using sprintf?

How can I add a newline to a plot&#39;s label (e.g. xlabel or ylabel) in matplotlib?  For example,

    plt.bar([1, 2], [4, 5])
    plt.xlabel(&quot;My x label&quot;)
    plt.ylabel(r&quot;My long label with $\Sigma_{C}$ math \n continues here&quot;) 

Ideally I&#39;d like the y-labeled to be centered too.  Is there a way to do this?  It&#39;s important that the label have both TeX (enclosed in &#39;$&#39;) and the newline.

Putting newline in matplotlib label with TeX in Python?

What is difference between `&#39;aa&#39;` and `&#39;\xaa&#39;`? What does the `\x` part mean? And which chapter of the Python documentation covers this topic?

What does a leading `\x` mean in a Python string `\xaa`

<p>What is difference between <code>'aa'</code> and <code>'\xaa'</code>? What does the <code>\x</code> part mean? And which chapter of the Python documentation covers this topic?</p>


Let&#39;s say I need a 3-digit number, so it would be something like: 

    &gt;&gt;&gt; random(3)
    563
    
    or
    
    &gt;&gt;&gt; random(5)
    26748
    &gt;&gt; random(2)
    56

How to generate a random number with a specific amount of digits?

What&#39;s the best way to rename photos with a unique filename on the server as they are uploaded, using django? I want to make sure each name is used only once. Are there any pinax apps that can do this, perhaps with GUID?

Enforce unique upload file names using django?

Why I have problem creating a class inheriting from str (or also from int)

    class C(str):
       def __init__(self, a, b):
         str.__init__(self,a)
         self.b = b

    C(&quot;a&quot;, &quot;B&quot;)
    
    TypeError: str() takes at most 1 argument (2 given)

the same happens if I try to use `int` instead of `str`, but it works with custom classes. I need to use `__new__` instead of `__init__`? why?

inheritance from str or int

I have a python class and ran pylint against it. One message it gave was:

    Warning: Method could be a function

Is this telling me that it would be better to move this method out of the class because it doesn&#39;t use any instance variables? 

In C# I would make this a static method. What&#39;s the most pythonic thing to do here? 

How to handle the pylint message: Warning: Method could be a function

I&#39;m currently using regular expressions to search through RSS feeds to find if certain words and phrases are mentioned, and would then like to extract the text on either side of the match as well. For example:

    String = &quot;This is an example sentence, it is for demonstration only&quot;
    re.search(&quot;is&quot;, String)
I&#39;d like to know the position(s) of where the &#39;is&#39; matches are found so that I can extract and output something like this:  

    1 match found: &quot;This is an example sentence&quot;

I know that it would be easy to do with splits, but I&#39;d need to know what the index of first character of the match was in the string, which I don&#39;t know how to find

Python - Locating the position of a regex match in a string?

Given any character from a to z, what is the most efficient way to get the next letter in the alphabet using PHP?

Most efficient way to get next letter in the alphabet using PHP

Quick question. Is there an equivalent of @ as applied to strings in Java:

For example I can do `@&quot;c:\afolder\afile&quot;` in C# and have it ignore the escape characters when processing instead of having to do `&quot;c:\\afolder\\aFile&quot;`. Is there a Java equivalent?

hmmm: stackoverflow is escaping on me .. lol. The second example should read:

c:(double-backslash)afolder(double-backslash)aFile

Java equivalent of C#&#39;s verbatim strings with @

I need to get the last character of a string.
Say I have &quot;testers&quot; as input string and I want the result to be &quot;s&quot;. how can I do that in PHP?

How to get the last char of a string in PHP?


I am in need of a JavaScript function which can take a value and pad it to a given length (I need spaces, but anything would do). I found this, but I have no idea what the heck it is doing and it doesn&#39;t seem to work for me.

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-js --&gt;

    String.prototype.pad = function(l, s, t) {
      return s || (s = &quot; &quot;),
        (l -= this.length) &gt; 0 ?
        (s = new Array(Math.ceil(l / s.length) + 1).join(s))
        .substr(0, t = !t ? l : t == 1 ?
          0 :
          Math.ceil(l / 2)) + this + s.substr(0, l - t) :
        this;
    };



    var s = &quot;Jonas&quot;;
    document.write(
      &#39;&lt;h2&gt;S = &#39;.bold(), s, &quot;&lt;/h2&gt;&quot;,
      &#39;S.pad(20, &quot;[]&quot;, 0) = &#39;.bold(), s.pad(20, &quot;[]&quot;, 0), &quot;&lt;br /&gt;&quot;,
      &#39;S.pad(20, &quot;[====]&quot;, 1) = &#39;.bold(), s.pad(20, &quot;[====]&quot;, 1), &quot;&lt;br /&gt;&quot;,
      &#39;S.pad(20, &quot;~&quot;, 2) = &#39;.bold(), s.pad(20, &quot;~&quot;, 2)
    );

&lt;!-- end snippet --&gt;



Is there a JavaScript function that can pad a string to get to a determined length?

I have a perplexing issue that I can&#39;t seem to comprehend...

I have two SQL statements:

- The first enters information from a form into the database.
- The second takes data from the database entered above, sends an email, and then logs the details of the transaction

The problem is that it appears that a single quote is triggering a MySQL error on the second entry only! The first instance works without issue, but the second instance triggers the `mysql_error()`.

Does the data from a form get handled differently from the data captured in a form?

Query 1 - This works without issue (and without escaping the single quote)

    $result = mysql_query(&quot;INSERT INTO job_log
    (order_id, supplier_id, category_id, service_id, qty_ordered, customer_id, user_id, salesperson_ref, booking_ref, booking_name, address, suburb, postcode, state_id, region_id, email, phone, phone2, mobile, delivery_date, stock_taken, special_instructions, cost_price, cost_price_gst, sell_price, sell_price_gst, ext_sell_price, retail_customer, created, modified, log_status_id)
    VALUES
    (&#39;$order_id&#39;, &#39;$supplier_id&#39;, &#39;$category_id&#39;, &#39;{$value[&#39;id&#39;]}&#39;, &#39;{$value[&#39;qty&#39;]}&#39;, &#39;$customer_id&#39;, &#39;$user_id&#39;, &#39;$salesperson_ref&#39;, &#39;$booking_ref&#39;, &#39;$booking_name&#39;, &#39;$address&#39;, &#39;$suburb&#39;, &#39;$postcode&#39;, &#39;$state_id&#39;, &#39;$region_id&#39;, &#39;$email&#39;, &#39;$phone&#39;, &#39;$phone2&#39;, &#39;$mobile&#39;, STR_TO_DATE(&#39;$delivery_date&#39;, &#39;%d/%m/%Y&#39;), &#39;$stock_taken&#39;, &#39;$special_instructions&#39;, &#39;$cost_price&#39;, &#39;$cost_price_gst&#39;, &#39;$sell_price&#39;, &#39;$sell_price_gst&#39;, &#39;$ext_sell_price&#39;, &#39;$retail_customer&#39;, &#39;&quot;.date(&#39;Y-m-d H:i:s&#39;, time()).&quot;&#39;, &#39;&quot;.date(&#39;Y-m-d H:i:s&#39;, time()).&quot;&#39;, &#39;1&#39;)&quot;);

Query 2 - This fails when entering a name with a single quote (for example, *O&#39;Brien*)

    $query = mysql_query(&quot;INSERT INTO message_log
    (order_id, timestamp, message_type, email_from, supplier_id, primary_contact, secondary_contact, subject, message_content, status)
    VALUES
    (&#39;$order_id&#39;, &#39;&quot;.date(&#39;Y-m-d H:i:s&#39;, time()).&quot;&#39;, &#39;$email&#39;, &#39;$from&#39;, &#39;$row-&gt;supplier_id&#39;, &#39;$row-&gt;primary_email&#39; ,&#39;$row-&gt;secondary_email&#39;, &#39;$subject&#39;, &#39;$message_content&#39;, &#39;1&#39;)&quot;);





Escaping single quote in PHP when inserting into MySQL

I&#39;m writing the JS for a chat application I&#39;m working on in my free time, and I need to have HTML identifiers that change according to user submitted data. This is usually something conceptually shaky enough that I would not even attempt it, but I don&#39;t see myself having much of a choice this time. What I need to do then is to escape the HTML id to make sure it won&#39;t allow for XSS or breaking HTML.

Here&#39;s the code:

    var user_id = escape(id)
    var txt = &#39;&lt;div class=&quot;chut&quot;&gt;&#39;+
                &#39;&lt;div class=&quot;log&quot; id=&quot;chut_&#39;+user_id+&#39;&quot;&gt;&lt;/div&gt;&#39;+
                &#39;&lt;textarea id=&quot;chut_&#39;+user_id+&#39;_msg&quot;&gt;&lt;/textarea&gt;&#39;+
                &#39;&lt;label for=&quot;chut_&#39;+user_id+&#39;_to&quot;&gt;To:&lt;/label&gt;&#39;+
                &#39;&lt;input type=&quot;text&quot; id=&quot;chut_&#39;+user_id+&#39;_to&quot; value=&#39;+user_id+&#39; readonly=&quot;readonly&quot; /&gt;&#39;+
                &#39;&lt;input type=&quot;submit&quot; id=&quot;chut_&#39;+user_id+&#39;_send&quot; value=&quot;Message&quot;/&gt;&#39;+
              &#39;&lt;/div&gt;&#39;;

What would be the best way to escape `id` to avoid any kind of problem mentioned above? As you can see, right now I&#39;m using the built-in `escape()` function, but I&#39;m not sure of how good this is supposed to be compared to other alternatives. I&#39;m mostly used to sanitizing input before it goes in a text node, not an id itself.

Sanitizing user input before adding it to the DOM in Javascript

I need a bash command that will convert a string to something that is escaped.  Here&#39;s an example:

    echo &quot;hello\world&quot; | escape | someprog


Where the escape command makes `&quot;hello\world&quot;` into `&quot;hello\\\world&quot;`.  Then, someprog can use `&quot;hello\\world&quot;` as it expects.  Of course, this is a simplified example of what I will really be doing.

Command to escape a string in bash

How do I insert a record in a column having varchar data type having single quote in it?

**Example**: first name is `ROBERT` and last name is **`D&#39;COSTA`**

How to handle a single quote in Oracle SQL

I am generating tables from classes in .NET and one problem is a class may have a field name `key` which is a reserved MySQL keyword. How do I escape it in a create table statement? (Note: The other problem below is text must be a fixed size to be indexed/unique)

    create table if not exists misc_info (
    id INTEGER PRIMARY KEY AUTO_INCREMENT NOT NULL,
    key TEXT UNIQUE NOT NULL,
    value TEXT NOT NULL)ENGINE=INNODB;



Content Type	Original Author	Original Content on Stackoverflow
Question	Haiyuan Zhang	View Question on Stackoverflow
Solution 1 - Python	Alex Martelli	View Answer on Stackoverflow
Solution 2 - Python	Jake Wharton	View Answer on Stackoverflow

What does a leading `\x` mean in a Python string `\xaa`

Python Problem Overview

Python Solutions

Solution 1 - Python

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Putting newline in matplotlib label with TeX in Python?

How to append strings using sprintf?

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