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How is Python's List Implemented?
...al proof: Indexing takes (of course with extremely small differences (0.0013 µsecs!)) the same time regardless of index:
...>python -m timeit --setup="x = [None]*1000" "x[500]"
10000000 loops, best of 3: 0.0579 usec per loop
...>python -m timeit --setup="x = [None]*1000" "x[0]"
10000000 loo...
An efficient way to transpose a file in Bash
...,j];
}
print str
}
}' file
output
$ more file
0 1 2
3 4 5
6 7 8
9 10 11
$ ./shell.sh
0 3 6 9
1 4 7 10
2 5 8 11
Performance against Perl solution by Jonathan on a 10000 lines file
$ head -5 file
1 0 1 2
2 3 4 5
3 6 7 8
4 9 10 11
1 0 1 2
$ wc -l < file
10000
$ time per...
generate days from date range
...
323
This solution uses no loops, procedures, or temp tables. The subquery generates dates for the ...
How to recognize swipe in all 4 directions
...
324
You need to have one UISwipeGestureRecognizer for each direction. It's a little weird because ...
How can I pass a list as a command-line argument with argparse?
...lt;Required> Set flag', required=True)
# Use like:
# python arg.py -l 1234 2345 3456 4567
nargs='+' takes 1 or more arguments, nargs='*' takes zero or more.
append
parser.add_argument('-l','--list', action='append', help='<Required> Set flag', required=True)
# Use like:
# python arg.py ...
How can I iterate over an enum?
... |
edited Oct 4 '19 at 13:37
David Tóth
1,17788 silver badges2929 bronze badges
answered Nov 4 '08 at...
Reverse a string in Python
...|
edited Feb 25 '14 at 2:13
Mokolodi1
11911 silver badge1010 bronze badges
answered May 31 '09 at 2:11
...
'console' is undefined error for Internet Explorer
...
379
Try
if (!window.console) console = ...
An undefined variable cannot be referred directly. H...
How to calculate the angle between a line and the horizontal axis?
...
388
First find the difference between the start point and the end point (here, this is more of a d...
Windows batch: formatted date into variable
...that contain the individual parts, would be:
for /f %%x in ('wmic path win32_localtime get /format:list ^| findstr "="') do set %%x
set today=%Year%-%Month%-%Day%
Much nicer than fiddling with substrings, at the expense of polluting your variable namespace.
If you need UTC instead of local time,...