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Extract value of attribute node via XPath
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data() function on an attribute gives the error "XPath error : Invalid expression" in xmllint.
– codesniffer
Sep 1 at 14:01
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How to convert a string to integer in C?
...o:
(int) strtol(str, (char **)NULL, 10)
except that the handling of errors may differ. If the value cannot be
represented, the behavior is undefined.
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What is the Difference Between read() and recv() , and Between send() and write()?
...tagram, both, recv and read will deliver no data to the caller but also no error. For the caller, the behavior is the same. The caller may not even know anything about datagrams (it may not know that this is a socket and not a file, it may not know that this is a datagram socket and not a stream soc...
Why doesn't JavaScript have a last method? [closed]
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answered Aug 21 '12 at 18:05
Pablo DiazPablo Diaz
53655 silver badges1515 bronze badges
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Greedy vs. Reluctant vs. Possessive Quantifiers
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507
I'll give it a shot.
A greedy quantifier first matches as much as possible. So the .* matches...
Actual meaning of 'shell=True' in subprocess
...gt; subprocess.call('echo $HOME')
Traceback (most recent call last):
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OSError: [Errno 2] No such file or directory
>>>
>>> subprocess.call('echo $HOME', shell=True)
/user/khong
0
Setting the shell argument to a true value causes subprocess to spawn an intermediate shell pro...
How to format numbers? [duplicate]
...void mathematical calculation (as this can introduce rounding, or rounding errors). If you don't want rounding, then you are only dealing with things as a string i.e. 1000.999 converted to two decimal places will only ever be 1000.99 and not 1001.00.
This method avoids using .split() and RegExp() h...
Event system in Python
...el is basically a bag-of-handlers with more features related to threading, error handling, ...
python-dispatch requires the even source classes to derive from pydispatch.Dispatcher.
buslane is class-based, supports single- or multiple handlers and facilitates extensive type hints.
Pithikos' Observer...
How to determine CPU and memory consumption from inside a process?
...y (PDH), which is a bit "unintuitive" and takes a lot of painful trial and error to get to work. (At least it took me quite a while, perhaps I've been only a bit stupid...)
Note: for clarity all error checking has been omitted from the following code. Do check the return codes...!
Total Virtual...
Python Pandas merge only certain columns
...ng this to merge column 'Unique_External_Users' from df2 to df1 but got an error ... "None of [Index(['U', 'n', 'i', 'q', 'u', 'e', '', 'E', 'x', 't', 'e', 'r', 'n', 'a',\n 'l', '', 'U', 's', 'e', 'r', 's'],\n dtype='object')] are in the [columns]" .
– CoolDocMan
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