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How to jump to a particular line in a huge text file?
...ld do something like:
# Read in the file once and build a list of line offsets
line_offset = []
offset = 0
for line in file:
line_offset.append(offset)
offset += len(line)
file.seek(0)
# Now, to skip to line n (with the first line being line 0), just do
file.seek(line_offset[n])
...
How do I specify new lines on Python, when writing on files?
In comparison to Java (in a string), you would do something like "First Line\r\nSecond Line" .
13 Answers
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How do I round a decimal value to 2 decimal places (for output on a page)
...Format("{0:C}", d) yield $12.35 - note that the current culture's currency settings including the symbol are used.
Note that "C" uses number of digits from current culture. You can always override default to force necessary precision with C{Precision specifier} like String.Format("{0:C2}", 5.123d)....
What is tail call optimization?
...il-call optimization is where you are able to avoid allocating a new stack frame for a function because the calling function will simply return the value that it gets from the called function. The most common use is tail-recursion, where a recursive function written to take advantage of tail-call op...
When is -XAllowAmbiguousTypes appropriate?
I've recently posted a question about syntactic-2.0 regarding the definition of share . I've had this working in GHC 7.6 :
...
What does default(object); do in C#?
... if(NoDataIsAvailable) {
value = default(T); // because I have to set it to *something*
return false;
}
value = GetData();
return true;
}
As it happens, I also use it in some code-generation, where it is a pain to initialize fields / variables - but if you know the typ...
Alphabet range in Python
...o put 123, since it will not be included).
In print function make sure to set the {:c} (character) format, and, in this case, we want it to print it all together not even letting a new line at the end, so end=''would do the job.
The result is this:
abcdefghijklmnopqrstuvwxyz
...
`static` keyword inside function?
...
Also, if the function has run once, it will not reset the value of $cache to null on later calls, right?
– user151841
Jul 6 '11 at 14:18
7
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How can I measure the speed of code written in PHP? [closed]
.../serialize\n";
Not perfect, but useful, and it doesn't take much time to set up.
The other solution, that works quite nice if you want to identify which function takes lots of time in an entire script, is to use :
The Xdebug extension, to generate profiling data for the script
Software that...
Shading a kernel density plot between two points.
...)
library(ggplot2)
qplot(x,y,data=dd,geom="line")+
geom_ribbon(data=subset(dd,x>q75 & x<q95),aes(ymax=y),ymin=0,
fill="red",colour=NA,alpha=0.5)
Result:
share
|
impro...