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30条爆笑的程序员梗 PHP是最好的语言 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...准备收你那个 10 秒时长，20 个字的笑话了。
抱歉，你的连接超时了。你好，你想听 TCP 的笑话么 。
30.问题
从前有个程序员遇到了一个问题。他想，没事，我懂，用线程就好了。现他有两个问题了。
原文：http://www.phpxs.com/pos...
How to rename with prefix/suffix?
...ly be short and simple for this. For example, to rename all *.jpg to prefix_*.jpg in the current directory:
for filename in *.jpg; do mv "$filename" "prefix_$filename"; done;
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Looping through a hash, or using an array in PowerShell
... how:
$hash = @{
a = 1
b = 2
c = 3
}
$hash.Keys | % { "key = $_ , value = " + $hash.Item($_) }
Output:
key = c , value = 3
key = a , value = 1
key = b , value = 2
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Set markers for individual points on a line in Matplotlib
...pixel marker
o circle marker
v triangle_down marker
^ triangle_up marker
< triangle_left marker
> triangle_right marker
1 tri_down marker
2 tri_up marker
3 ...
Omit rows containing specific column of NA
I want to know how to omit NA values in a data frame, but only in some columns I am interested in.
8 Answers
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What does it mean: The serializable class does not declare a static final serialVersionUID field? [d
...
@EJP It would be helpful for all if you enumerated the errors.
– MrMas
Jun 18 '14 at 16:18
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How to exit a 'git status' list in a terminal?
... If you're getting the E37: No write since last change (add ! to override) error, do what it says and use :q!
– Noumenon
Aug 24 '15 at 15:05
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Why does volatile exist?
...expects. Just like the "most vexing parse" is not the sign of the compiler error, neither is the case here.
– iheanyi
Jul 17 '18 at 23:54
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Is null check needed before calling instanceof?
...B b) {
// Overloaded version. Would cause reference ambiguity (compile error)
// if Test.test(null) was called without casting.
// So you need to call Test.test((A)null) or Test.test((B)null).
}
}
So Test.test((A)null) will print a instanceof A: false.)
P.S.: If you are hiring, pl...
How do you display code snippets in MS Word preserving format and syntax highlighting?
... from the rest of the document, as if it was a picture or a chart
spelling errors won't be highlighted in the code (this is cool !)
And it takes only few seconds.
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