How to add multiple values per key in python dictionary
The value for each key can either be a set (distinct list of unordered elements) or a list (ordered sequence of elements )
How does jemalloc work? What are the benefits?
jemalloc first appeared for FreeBSD, the brainchild of one “Jason Evans”, hence the “je”. I would ridicule him for being egotistical had I not once written an operating system called paxos 🙂 See this PDF for full details. It’s a white paper describing in detail how the algorithms work. The main benefit is scalability in multi-processor and multi-threaded systems achieved, … Read more
What’s the difference between %s and %d in Python string formatting?
I don’t understand what %s and %d do and how they work.
The located assembly’s manifest definition does not match the assembly reference
The .NET Assembly loader: is unable to find 1.2.0.203 but did find a 1.2.0.200 This assembly does not match what was requested and therefore you get this error. In simple words, it can’t find the assembly that was referenced. Make sure it can find the right assembly by putting it in the GAC or in … Read more
Pythonic way to create a long multi-line string
Are you talking about multi-line strings? Easy, use triple quotes to start and end them. You can use single quotes too (3 of them of course at start and end) and treat the resulting string s just like any other string. NOTE: Just as with any string, anything between the starting and ending quotes becomes part of … Read more
How to find memory leak in a C++ code/project?
Instructions Things You’ll Need Proficiency in C++ C++ compiler Debugger and other investigative software tools 1 Understand the operator basics. The C++ operator new allocates heap memory. The delete operator frees heap memory. For every new, you should use a delete so that you free the same memory you allocated: 2 Reallocate memory only if you’ve deleted. In the code below, str acquires a … Read more
How can I declare and use Boolean variables in a shell script?
Revised Answer (Feb 12, 2014) Original Answer Caveats: https://stackoverflow.com/a/21210966/89391 From: Using boolean variables in Bash The reason the original answer is included here is because the comments before the revision on Feb 12, 2014 pertain only to the original answer, and many of the comments are wrong when associated with the revised answer. For example, Dennis Williamson’s … Read more
XPath //div[contains(text(), ‘string’)] fails to select divs containing ‘string’
Replace text() with string(): Or, you can check that span‘s following text sibling contains the text: Also see: Difference between text() and string()
Jquery : Refresh/Reload the page on clicking a button
You should use the location.reload(true), which will release the cache for that specific page and force the page to load as a NEW page. The true parameter forces the page to release it’s cache.
Python string.replace regular expression
str.replace() v2|v3 does not recognize regular expressions. To perform a substitution using a regular expression, use re.sub() v2|v3. For example: In a loop, it would be better to compile the regular expression first: