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Way to read first few lines for pandas dataframe
...ces of large files
which seems to work. Using one of the standard large test files (988504479 bytes, 5344499 lines):
In [1]: import pandas as pd
In [2]: time z = pd.read_csv("P00000001-ALL.csv", nrows=20)
CPU times: user 0.00 s, sys: 0.00 s, total: 0.00 s
Wall time: 0.00 s
In [3]: len(z)
Out[3...
Firebug says “No Javascript on this page”, even though JavaScript does exist on the page
...
EDIT 2017 April
This answer is now outdated and I'm not even testing it anymore because I'm no longer using Firebug (a shame, I loved it years ago in a time it was The tool of trade for web developing).
EDIT 2014 November
The original answer is now more than a year outdated due to f...
Programmatically open new pages on Tabs
...eciate your answer, but I do know that Firefox will do it (some texts, not tested by me, remark that this is not always true, there's a 50-50 chance to get a new window or tab). I also think this shouldn't be an issue, but, you know clients :)
– Ricardo Vega
Ja...
How to change the ROOT application?
...I'm not sure if doing this would have any negative implications, but I did test this and it does seem to work.
How can I get `find` to ignore .svn directories?
...
@Kaleb: As comparing the file type (equivalent to testing whether a bit is set in an integer) is faster than comparing the filename (equivalent to a string comparison, which is O(n)), putting -type d before -name .svn is theoretically more efficient. However, it is usually i...
What is the advantage of using heredoc in PHP? [closed]
...something</li>
<li>$whatever</li>
<li>$testing123</li>
</ul>
</div>
HTML;
// Sometime later
echo $html;
It is easy to read and easy to maintain.
The alternative is echoing quoted strings, which end up containing escaped quotes and IDEs ...
tinyxml XML解析库下载（tinyxml2.h 和 tinyxml2.cpp） - 源码下载 - 清泛...
...d of allocation.
*/
/*
gcc:
g++ -Wall -DDEBUG tinyxml2.cpp xmltest.cpp -o gccxmltest.exe
Formatting, Artistic Style:
AStyle.exe --style=1tbs --indent-switches --break-closing-brackets --indent-preprocessor tinyxml2.cpp tinyxml2.h
*/
#if defined( _DEBUG ) || defined( ...
MongoDB: Is it possible to make a case-insensitive query?
...
I recently tested with mongodb 3.0.4 with 100,000 records with a name field indexed. The case insensitive regex query takes over 200ms where casesensitive regex takes about 16ms.(Both cases include regex start with '^')
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How to align content of a div to the bottom
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@fguillen: tested in Chrome (v31) just now as well. Works there, too.
– Daniel Szabo
Dec 18 '13 at 7:14
5
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Detecting superfluous #includes in C/C++?
... relatively slow. Eclipse CDT's analysis is fast (interactive) and, when I tested it, less accurate.
– Josh Kelley
Jul 12 '18 at 15:19
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sho...