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Way to read first few lines for pandas dataframe
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I think you can use the nrows parameter. From the docs:
nrows : int, default None
Number of rows of file to read. Useful for reading pieces of large files
which seems to work. Using one of the standard large test files (988504479 bytes, 5344499 lines):
In ...
Merge / convert multiple PDF files into one PDF
...DEVICE=pdfwrite -dPDFSETTINGS=/prepress -o merged.pdf mine1.pdf mine2.pdf. From Documentation: "As a convenient shorthand you can use the -o option followed by the output file specification as discussed above. The -o option also sets the -dBATCH and -dNOPAUSE options. This is intended to be a quick ...
C++ template constructor
...lare any
constructor(including a templated
one), the compiler will refrain from
declaring a default constructor.
Unless you declare a copy-constructor (for class X one
that takes X or X& or X const
&) the compiler will generate the
default copy-constructor.
If you provide a template cons...
Test whether a glob has any matches in bash
...le, but a file called *.[cC]) or false negative if the first file expanded from that is for instance a symlink to an unexistent file or to a file in a directory you don't have access to (you way want to add a || [ -L "$1" ]).
– Stephane Chazelas
Jun 13 '13 at 2...
Generic List - moving an item within the list
... {
list[i] = list[i - 1];
}
}
// put element from position 1 to destination
list[newIndex] = tmp;
}
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Test if string is a guid without throwing exceptions?
...00 good: 637,633 ticks
10,000 bad: 717,894 ticks
COM Interop CLSIDFromString
10,000 good: 126,120 ticks
10,000 bad: 23,134 ticks
COM Intertop (Fastest) Answer:
/// <summary>
/// Attempts to convert a string to a guid.
/// </summary>
/// <param name="s">The s...
How to change CSS using jQuery?
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You cannot leave the curly brackets out, but you may leave the quotes out from around backgroundColor and color. If you use background-color you must put quotes around it because of the hyphen.
In general, it's a good habit to quote your Javascript objects, since problems can arise if you do not q...
What does the > (greater than bracket) mean beside file names in Eclipse's Package Explorer?
...p a new dev machine with Eclipse 3.7 Indigo. After pulling a my code down from SVN, the source tree in the Package Explorer is intermittently littered with a > to the left of the file name The parent package names have them too. (Note that this is an AspectJ project, but I don't think that matte...
Escape a string for a sed replace pattern
In my bash script I have an external (received from user) string, which I should use in sed pattern.
14 Answers
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Technically what is the main difference between Oracle JDK and OpenJDK? [duplicate]
...orm across both now... In the end switching to Apache HttpClient saved me from having to install Oracle JDK. Another instance: OpenJDK 8 doesn't support TLS_ECDHE cipher suites, though it does support TLS_DHE. It's a bummer, but I'll sacrifice some CPU to keep my EC2 deployments simpler
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