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What are file descriptors, explained in simple terms?
...tandard Output, and file descriptor 2 with Standard Error.
File descriptor ranges from 0 to OPEN_MAX. File descriptor max value can be obtained with ulimit -n. For more information, go through 3rd chapter of APUE Book.
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Difference between two dates in Python
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pd.date_range('2019-01-01', '2019-02-01').shape[0]
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How to use the pass statement?
...the debugger on the 20th iteration of a for... in statement. So:
for t in range(25):
do_a_thing(t)
if t == 20:
pass
with the breakpoint on pass.
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Merge branch with trunk
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First switch your working copy to the trunk.
Then do a merge range of revisions, from the branch to trunk.
Once this dialog is complete the differences will be pending changes in your working copy of trunk. You'll need to commit them just as if you manually made the changes on your wor...
image processing to improve tesseract OCR accuracy
...ing tesseract to convert documents into text. The quality of the documents ranges wildly, and I'm looking for tips on what sort of image processing might improve the results. I've noticed that text that is highly pixellated - for example that generated by fax machines - is especially difficult for ...
What is the use of join() in Python threading?
...def run(self):
print self.time, " seconds start!"
for i in range(0,self.time):
time.sleep(1)
print "1 sec of ", self.time
print self.time, " seconds finished!"
t1 = Kiki(3)
t2 = Kiki(2)
t3 = Kiki(1)
t1.join()
print "t1.join() finished"
t2.join()
prin...
Why are Where and Select outperforming just Select?
...00;
Random r = new Random();
var list = Enumerable.Range(0, total).Select(i => r.Next(0, 5)).ToList();
for (int i = 0; i < 4000000; i++)
list[i] = 10;
var sw = new Stopwatch();
sw.Start();
int sum = 0;
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What are the advantages of using a schema-free database like MongoDB compared to a relational databa
...s of data. The underlying engine is very stable and copes well with a good range of data volumes. It also runs on your choice of hardware and operating system. Postgres providing NoSQL capabilities along with full transaction support, storing JSON documents with constraints on the fields data.
Gene...
Progress indicator during pandas operations
...for just plain iterables originally: from tqdm import tqdm; for i in tqdm( range(int(1e8)) ): pass The pandas support was a recent hack I made :)
– casper.dcl
Dec 20 '15 at 20:19
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Why can't strings be mutable in Java and .NET?
...tring(..,..)), the String(String) constructor makes a copy of the relevant range of the underlying array.
– LordOfThePigs
Dec 22 '10 at 10:06
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