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What is the X-REQUEST-ID http header?
...en you're operating a webservice that is accessed by clients, it might be difficult to correlate requests (that a client can see) with server logs (that the server can see).
The idea of the X-Request-ID is that a client can create some random ID and pass it to the server. The server then include th...
Python dict how to create key or append an element to key?
...default(...)
D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D
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Run class in Jar file
If you have a jar file called myJar.jar located in /myfolder and you want to use the class called myClass from it, how do you go about doing it from the command line?
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vim deleting backward tricks
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@roggan87 If you're on the last letter of a word, db deletes the letters preceding the last letter but still leaves the last letter.
– Prashanth Chandra
Sep 18 '16 at 6:03
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Escaping quotes and double quotes
... which quotes are needed, and which things you were attempting to escape.) If you want to work with the output, you may want to add the -NoNewWindow switch.
BTW: this was so important issue that since v3 you can use --% to stop the PowerShell parser from doing anything with your parameters:
\\serv...
How does a Linux/Unix Bash script know its own PID?
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use $BASHPID or $$
See the manual for more information, including differences between the two.
TL;DRTFM
$$ Expands to the process ID of the shell.
In a () subshell, it expands to the process ID of the invoking shell, not the subshell.
$BASHPID Expands to the process ID of the current ...
How to get the ASCII value of a character
...in whatever encoding it's in. Therefore the result of ord('ä') can be 228 if you're using Latin-1, or it can raise a TypeError if you're using UTF-8. It can even return the Unicode codepoint instead if you pass it a unicode:
>>> ord(u'あ')
12354
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What are the differences between the urllib, urllib2, urllib3 and requests module?
In Python, what are the differences between the urllib , urllib2 , urllib3 and requests modules? Why are there three? They seem to do the same thing...
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how to convert binary string to decimal?
...t function converts strings to numbers, and it takes a second argument specifying the base in which the string representation is:
var digit = parseInt(binary, 2);
See it in action.
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Are 2^n and n*2^n in the same time complexity?
...r about when it is okay to ignore terms in a time complexity equation, specifically with non-polynomial examples.
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