大约有 43,100 项符合查询结果（耗时：0.0488秒） [XML]
Test if string is a number in Ruby on Rails
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12 Answers
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Bash: If/Else statement in one line
...e it is called some_process ) is running on a server. If it is, then echo 1, otherwise echo 0.
5 Answers
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Can Java 8 code be compiled to run on Java 7 JVM?
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No, using 1.8 features in your source code requires you to target a 1.8 VM. I just tried the n...
How do you get the logical xor of two variables in Python?
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1250
If you're already normalizing the inputs to booleans, then != is xor.
bool(a) != bool(b)
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Change the name of a key in dictionary
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How do you extract a column from a multi-dimensional array?
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>>> import numpy as np
>>> A = np.array([[1,2,3,4],[5,6,7,8]])
>>> A
array([[1, 2, 3, 4],
[5, 6, 7, 8]])
>>> A[:,2] # returns the third columm
array([3, 7])
See also: "numpy.arange" and "reshape" to allocate memory
Example: (Allocating a ar...
How can we programmatically detect which iOS version is device running on? [duplicate]
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How do I add the contents of an iterable to a set?
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231
You can add elements of a list to a set like this:
>>> foo = set(range(0, 4))
>>...
outline on only one border
...{
content: "\a0";
display: block;
padding: 2px 0;
line-height: 1px;
border-top: 1px dashed #000;
}
.element p {
padding: 0 10px;
}
<div class="element">
<p>Some content comes here...</p>
</div>
(Or see external demo.)
All sizes and colors ar...