大约有 42,000 项符合查询结果（耗时：0.0433秒） [XML]
Progress indicator during pandas operations
...l.join()
results = sorted(results, key=lambda x:x[0])
results = pd.concat([split[1] for split in results])
return results
Bellow is a test code for a parallelized apply with tqdm "progress_apply".
from time import time
from tqdm import tqdm
tqdm.pandas()
if __name__ == '__main__':
...
Listing all permutations of a string/integer
...ment.
The permutation of a set of elements is a list each of the elements, concatenated with every permutation of the other elements.
Example:
If the set just has one element -->
return it.
perm(a) -> a
If the set has two characters: for
each element in it: return the
element, with the permut...
Datatype for storing ip address in SQL Server
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concat_ws('.',(IPAddr & 0xFF000000)>>24,(IPAddr & 0xFF0000)>>16,(IPAddr & 0xFF00)>>8, (IPAddr & 0xFF)) will convert a unsigned long containing an IP adress to a human readable form.
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Are HLists nothing more than a convoluted way of writing tuples?
...
write a generic prepend/append function
write a reverse function
write a concat function
...
You can do all of that with tuples of course, but not in the general case. So using HLists makes your code more DRY.
share
...
What is the difference between currying and partial application?
...m,_){1+accum})(empty-list);
function reverse = curry(fold)(lambda(accum,e){concat(e,accum)})(empty-list);
/* ... */
@list = [1, 2, 3, 4]
sum(list) //returns 10
@f = fold(lambda(accum,e){e+accum}) //f = lambda(accumulator,list) {/*...*/}
f(0,list) //returns 10
@g = f(0) //same as sum
g(list) //retu...
Why isn't Python very good for functional programming? [closed]
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return layer
Haskell:
grandKids generation kidsFunc val =
iterate (concatMap kidsFunc) [val] !! generation
The main difference here is that Haskell's standard library has useful functions for functional programming: in this case iterate, concat, and (!!)
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Java 8 Streams - collect vs reduce
...two different approaches:
If we wanted to take a stream of strings and concatenate them into a
single long string, we could achieve this with ordinary reduction:
String concatenated = strings.reduce("", String::concat)
We would get the desired result, and it would even work in parall...
How to avoid long nesting of asynchronous functions in Node.js
...e.slice.call(arguments);
return function() {
fun.apply(null, preArgs.concat.apply(preArgs, arguments));
};
};
Queue = [];
Queue.execute = function () {
if (Queue.length) {
Queue.shift()(Queue.execute);
}
};
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Select by partial string from a pandas DataFrame
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Performance wise, regex search is slower than substring search:
df2 = pd.concat([df1] * 1000, ignore_index=True)
%timeit df2[df2['col'].str.contains('foo')]
%timeit df2[df2['col'].str.contains('foo', regex=False)]
6.31 ms ± 126 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
2.8 ms ...
Algorithm to return all combinations of k elements from n
...
elements.Skip(i + 1).Combinations(k - 1).Select(c => (new[] {e}).Concat(c)));
}
Usage:
var result = Combinations(new[] { 1, 2, 3, 4, 5 }, 3);
Result:
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