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Remove the first character of a string
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deleting a char:
def del_char(string, indexes):
'deletes all the indexes from the string and returns the new one'
return ''.join((char for idx, char in enumerate(string) if idx not in indexes))
it deletes all the chars that are in indexes; you can use...
Get a pixel from HTML Canvas?
...geData object for the whole image (0,0,width,height), and then compute the index using idx = (y * width + x) * 4 like Georg's answer. However, don't forget to refresh that cached object every time the image changes.
– noio
Oct 28 '13 at 12:30
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What is the purpose of setting a key in data.table?
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A key is basically an index into a dataset, which allows for very fast and efficient sort, filter, and join operations. These are probably the best reasons to use data tables instead of data frames (the syntax for using data tables is also much mo...
pandas read_csv and filter columns with usecols
...andas.read_csv when I filter the columns with usecols and use multiple indexes.
5 Answers
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SqlException from Entity Framework - New transaction is not allowed because there are other threads
...ant to you, just order by primary key as that's likely to have a clustered index.
This version will query the database in batches of 100. Note that SaveChanges() is called for each entity.
If you want to improve your throughput dramatically, you should call SaveChanges() less frequently. Use cod...
How to version control a record in a database
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Yes, but you can deal with that by indexing and/or partitioning the table. Also, there will only be a small handful of large tables. Most will be much smaller.
– ConcernedOfTunbridgeWells
Nov 27 '08 at 12:46
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How can I add an ampersand for a value in a ASP.net/C# app config file value
... at http://www.theukwebdesigncompany.com/articles/entity-escape-characters.php
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phantomjs not waiting for “full” page load
...nt.
var page = require("webpage").create(),
url = "http://example.com/index.html";
function onPageReady() {
var htmlContent = page.evaluate(function () {
return document.documentElement.outerHTML;
});
console.log(htmlContent);
phantom.exit();
}
page.open(url, functio...
Sorting a Python list by two fields
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@MikeAxiak: docs.python.org/2/library/stdtypes.html#index-29 states in comment 9: Starting with Python 2.3, the sort() method is guaranteed to be stable. A sort is stable if it guarantees not to change the relative order of elements that compare equal — this is helpful for s...
What is data oriented design?
...ample
procedural approach.
int animation; // this value is the animation index
if(animation == 0)
PerformMoveForward();
else if(animation == 1)
PerformMoveBack();
.... // etc
data design approach
typedef struct
{
int Index;
void (*Perform)();
}AnimationIndice;
// build my animation...