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Understanding the map function
...tr(x) for x in iterable ]
b = time.clock() - b
print(a,b)
test1(range(2000000)) # Prints ~1.7e-5s ~8s
test2(range(2000000)) # Prints ~9s ~8s
As you can see initializing the map function takes almost no time at all. However iterating through the map object takes longer than sim...
Parallel foreach with asynchronous lambda
...xception(exceptions);
}
}
}
Usage example:
await Enumerable.Range(1, 10000).ParallelForEachAsync(async (i) =>
{
var data = await GetData(i);
}, maxDegreeOfParallelism: 100);
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How to compare dates in datetime fields in Postgresql?
I have been facing a strange scenario when comparing between dates in postgresql(version 9.2.4 in windows). I have a column in my table say update_date with type 'timestamp without timezone'. Client can search over this field with only date (i.e: 2013-05-03) or date with time (i.e: 2013-05-03 12:20:...
What is SaaS, PaaS and IaaS? With examples
...
@AzfarNiaz, Google Computer Engine doesn't really provide raw hardware right?
– Pacerier
May 14 '14 at 18:51
2
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What is the runtime performance cost of a Docker container?
...on-CPU hardware); there's significant overhead around memory paging... but raw floating-point? I'd want to look at what was actually going on there -- perhaps excessive context switches.
– Charles Duffy
Jan 8 '15 at 3:38
...
jQuery equivalent of JavaScript's addEventListener method
... embed tag. The only way I found to trap a load event on these were to use raw JavaScript.
This will not work (I've tried on/bind/load methods):
$img.on('load', function () {
console.log('FOO!');
});
However, this works:
$img[0].addEventListener('load', function () {
console.log('FOO!')...
Partly JSON unmarshal into a map in Go
...Printf("car (returned): %s\n", v.(*Car).GetName())
for k, item := range car.ItemArr {
fmt.Printf("ItemArr[%d] of car (original): %s\n", k, item.GetName())
}
for k, item := range v.(*Car).ItemArr {
fmt.Printf("ItemArr[%d] of car (returned): %s\n", k, ...
Move an array element from one array position to another
...example, this was [1]. So we take the first index of that array to get the raw 1 there.
Then we use splice to insert this element in the new_index's place. Since we padded the array above if new_index > arr.length, it will probably appear in the right place, unless they've done something strange ...
What is the preferred syntax for initializing a dict: curly brace literals {} or the dict() function
...is a good choice:
a=dict(zip(['Mon','Tue','Wed','Thu','Fri'], [x for x in range(1, 6)]))
mydict=dict(zip(['mon','tue','wed','thu','fri','sat','sun'],
[random.randint(0,100) for x in range(0,7)]))
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Explanation of JSONB introduced by PostgreSQL
...ted" order.
JSONB objects are stored as decompressed binary as opposed to "raw data" in JSON , where no reparsing of data is required during retrieval.
JSONB also supports indexing, which can be a significant advantage.
In general, one should prefer JSONB , unless there are specialized needs, such...