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Actual meaning of 'shell=True' in subprocess
...gt; subprocess.call('echo $HOME')
Traceback (most recent call last):
...
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...
Concatenating two lists - difference between '+=' and extend()
...F instruction, but for += it will use LOAD_FAST - and you get *UnboundLocalError: local variable 'l' referenced before assignment*
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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...
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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List files by last edited date
... Mac OS X, option -printf is not available on BSD find (you will get this error: find: -printf: unknown primary or operator). Fortunately you can Install GNU find through Homebrew (there should be an option to Fink and Macports as well):
brew install findutils
After install it the GNU find shoul...
Python dictionary: Get list of values for list of keys
...68 ms per loop
100 loops, best of 3: 2 ms per loop
100 loops, best of 3: 2.05 ms per loop
100 loops, best of 3: 2.19 ms per loop
100 loops, best of 3: 2.53 ms per loop
100 loops, best of 3: 2.9 ms per loop
So in this case the clear winner is f = operator.itemgetter(*l); f(m), and clear outsider: m...
In Python, when to use a Dictionary, List or Set?
...fault
– Gigi Bayte 2
Oct 7 '18 at 5:05
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How do I merge a list of dicts into a single dict?
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edited Nov 25 '18 at 20:05
wim
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answered A...
Select SQL Server database size
... I have some VLDBs that cause DECIMAL(8,2) to yeild "Arithmetic overflow error converting numeric to data type numeric." Changing DECIMAL(8,2) to DECIMAL(12,2) was the fix.
– colbybhearn
Aug 18 '15 at 15:12
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Why it's not possible to use regex to parse HTML/XML: a formal explanation in layman's terms
...ood explanation of finite state automata here: youtube.com/watch?v=vhiiia1_hC4
– GDP2
Feb 9 '16 at 0:00
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