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What is the difference between concurrency and parallelism?
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Concurrency is when two or more tasks can start, run, and complete in overlapping time periods. It doesn't necessarily mean they'll ever both be running at the same instant. For example, multitasking on a single-core machine.
Parallelism is when tasks literally ru...
How can building a heap be O(n) time complexity?
...e for buildHeap using the siftUp and siftDown operations we've described.
Start at the top of the heap (the beginning of the array) and call siftUp on each item. At each step, the previously sifted items (the items before the current item in the array) form a valid heap, and sifting the next item u...
How to remove the left part of a string?
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Starting in Python 3.9, you can use removeprefix:
'Path=helloworld'.removeprefix('Path=')
# 'helloworld'
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What exactly is Python multiprocessing Module's .join() Method Doing?
...e this behavior by setting the daemon flag on the Process to True prior to starting the process:
p = Process(target=say_hello)
p.daemon = True
p.start()
# Both parent and child will exit here, since the main process has completed.
If you do that, the child process will be terminated as soon as th...
Are lists thread-safe?
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t1 = threading.Thread(target=add)
t2 = threading.Thread(target=remove)
t1.start()
t2.start()
t1.join()
t2.join()
print(l)
Output when ERROR
Exception in thread Thread-63:
Traceback (most recent call last):
File "/Users/zup/.pyenv/versions/3.6.8/lib/python3.6/threading.py", line 916, in _boots...
What is the difference between the kernel space and the user space?
...perating systems transition between rings?
when the CPU is turned on, it starts running the initial program in ring 0 (well kind of, but it is a good approximation). You can think this initial program as being the kernel (but it is normally a bootloader that then calls the kernel still in ring 0)....
How can I match multiple occurrences with a regex in JavaScript similar to PHP's preg_match_all()?
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@fdrv You have to reset the lastIndex to zero before starting the loop: this.lastIndex = 0;
– C-F
Jun 15 '17 at 4:13
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How to run a hello.js file in Node.js on windows?
... console.log('Server running at http://127.0.0.1:1337/');
Save the file
Start -> Run... -> cmd
c:
C:>node hello.js
Server running at http://127.0.0.1:1337/
That's it. This was done on Windows XP.
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MySQL connection not working: 2002 No such file or directory
...localhost you must use 127.0.0.1 instead." - php.net/manual/en/mysqli.quickstart.connections.php. So basically something is not working with connecting to the Unix domain sockets that allow localhost to work and TCP/IP is working so changing it to the TCP/IP address 127.0.0.1 will work.
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How to “inverse match” with regex?
... (plus, the OP never mentioned the string had to occur at the start of the line)
– Dan
Oct 2 '08 at 20:37
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