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Why can't Python's raw string literals end with a single backslash?
...ng with a slash I suggest you can use this trick:
>>> print r"c:\test"'\\'
test\
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ERROR 2006 (HY000): MySQL server has gone away
...under [mysqld] section, not [mysql].
Don't afraid to use large numbers for testing (like 1G).
Don't forget to restart the MySQL/MariaDB server.
Double check the value was set properly by:
mysql -sve "SELECT @@max_allowed_packet" # or:
mysql -sve "SHOW VARIABLES LIKE 'max_allowed_packet'"
You got ...
Javascript : natural sort of alphanumerical strings
... recognize numbers. You can do case-insensitive using sensitivity: 'base'. Tested in Chrome, Firefox, and IE11.
Here's an example. It returns 1, meaning 10 goes after 2:
'10'.localeCompare('2', undefined, {numeric: true, sensitivity: 'base'})
For performance when sorting large numbers of strings...
pandas GroupBy columns with NaN (missing) values
...3),
[1] * (2 * 3)]
col_names = ['col_a', 'col_b', 'value']
test_df = pd.DataFrame(data_block, index=col_names).T
grouped_df = safe_groupby(test_df, ['col_a', 'col_b'],
OrderedDict([('value', 'sum')]))
This will return the successful result without having ...
Get program execution time in the shell
...assful of students' programs:
fmt="run { date = '$(date)', user = '$who', test = '$test', host = '$(hostname)', times = { user = %U, system = %S, elapsed = %e } }"
/usr/bin/time -f "$fmt" -o $timefile command args...
I later concatenated all the $timefile files and pipe the output into a Lua inte...
Which is faster : if (bool) or if(int)?
...
Yeah, the discussion's fun. But just test it:
Test code:
#include <stdio.h>
#inclu
Access to the path is denied
...en adds extra checks to generate better messages, but this is an expensive test on a network. Perf is a feature too.
You need to use a name like 'C:\inetpub\wwwroot\mysite\images\savehere\mumble.jpg'. Consider Path.Combine() to reliably generate the path name.
...
When creating HTML emails, should we use html, head, body tags?
...
-1 The right way is to test it in the relevant clients. While mail clients should follow the standards, virtually none of them do.
– Dan Blows
Jan 6 '12 at 17:50
...
Request is not available in this context
...ption occurs in the logger (even if handled).
It appears that rather than testing for Request availability, you can test for Handler availability: when there is no Request, it would be strange to still have a request handler. And testing for Handler does not raise that dreaded Request is not availa...
How to declare a friend assembly?
...tocol Buffers I use:
[assembly:InternalsVisibleTo("Google.ProtocolBuffers.Test,PublicKey="+
"00240000048000009400000006020000002400005253413100040000010001008179f2dd31a648"+
"2a2359dbe33e53701167a888e7c369a9ae3210b64f93861d8a7d286447e58bc167e3d99483beda"+
"72f738140072bb69990bc4f98a21365de2c105e848...