大约有 13,906 项符合查询结果（耗时：0.0280秒） [XML]
Print a string as hex bytes?
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Your can transform your string to a int generator, apply hex formatting for each element and intercalate with separator:
>>> s = "Hello world !!"
>>> ":".join("{:02x}".format(ord(c)) for c in s)
'48:65:6c:6c:6f:20:77:6f:72:6c:64:20:21:21
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What is the benefit of using $() instead of backticks in shell scripts?
...ng to figure out if some form of escaping will work on the backticks.
An example, though somewhat contrived:
deps=$(find /dir -name $(ls -1tr 201112[0-9][0-9]*.txt | tail -1l) -print)
which will give you a list of all files in the /dir directory tree which have the same name as the earliest date...
Using LINQ to remove elements from a List
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Well, it would be easier to exclude them in the first place:
authorsList = authorsList.Where(x => x.FirstName != "Bob").ToList();
However, that would just change the value of authorsList instead of removing the authors from the previous collection....
Create an empty list in python with certain size
...None, None, None, None, None, None, None, None]
Assigning a value to an existing element of the above list:
>>> l[1] = 5
>>> l
[None, 5, None, None, None, None, None, None, None, None]
Keep in mind that something like l[15] = 5 would still fail, as our list has only 10 element...
Which method performs better: .Any() vs .Count() > 0?
in the System.Linq namespace, we can now extend our IEnumerable's to have the Any() and Count() extension methods .
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How do I return multiple values from a function? [closed]
...re added in 2.6 for this purpose. Also see os.stat for a similar builtin example.
>>> import collections
>>> Point = collections.namedtuple('Point', ['x', 'y'])
>>> p = Point(1, y=2)
>>> p.x, p.y
1 2
>>> p[0], p[1]
1 2
In recent versions of Python 3 (...
What are paramorphisms?
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foldr :: (a -> b -> b) -> b -> [a] -> b
para c n (x : xs) = c x xs (para c n xs)
foldr c n (x : xs) = c x (foldr c n xs)
para c n [] = n
foldr c n [] = n
Some people call paramorphisms "primitive recursion" by contrast with catamorphisms (foldr) being "iter...
Xml Namespace breaking my xpath! [duplicate]
I have the following XML:
5 Answers
5
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What is the difference between Python's list methods append and extend?
What's the difference between the list methods append() and extend() ?
20 Answers
2...
How does java do modulus calculations with negative numbers?
... get a negative number for negative inputs then you can use this:
int r = x % n;
if (r > 0 && x < 0)
{
r -= n;
}
Likewise if you were using a language that returns a negative number on a negative input and you would prefer positive:
int r = x % n;
if (r < 0)
{
r += n;
}
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