大约有 15,475 项符合查询结果（耗时：0.0254秒） [XML]
How to clone a Date object?
...py and call it SuperDate or something, withing your scope. Lots of hard to test for bugs are caused by object functionality changing unexpectedly.
– Ray Foss
Jan 28 '16 at 13:29
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How to erase the file contents of text file in Python?
...e to overwrite the file. In C++:
#include <fstream>
std::ofstream("test.txt", std::ios::out).close();
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How to access command line arguments of the caller inside a function?
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One can do it like this as well
#!/bin/bash
# script_name function_test.sh
function argument(){
for i in $@;do
echo $i
done;
}
argument $@
Now call your script like
./function_test.sh argument1 argument2
shar...
javascript i++ vs ++i [duplicate]
... Guffa is correct here. jsperf.com/ppi-vs-ipp-forloop when I run this test and it shows i++ being faster in a for loop, but not by enough to be significant. While ++i may be faster in other languages, I think it's safe to say javascript optimizes the operation to be the same.
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Reserved keywords in JavaScript
...vedKeyword(wordToCheck) {
var reservedWord = false;
if (/^[a-z]+$/.test(wordToCheck)) {
try {
eval('var ' + wordToCheck + ' = 1');
} catch (error) {
reservedWord = true;
}
}
return reservedWord;
}
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How to use protractor to check if an element is visible?
I'm trying to test if an element is visible using protractor. Here's what the element looks like:
8 Answers
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Reduce left and right margins in matplotlib plot
... np
data = np.arange(3000).reshape((100,30))
plt.imshow(data)
plt.savefig('test.png', bbox_inches='tight')
Another way is to use fig.tight_layout()
import matplotlib.pyplot as plt
import numpy as np
xs = np.linspace(0, 1, 20); ys = np.sin(xs)
fig = plt.figure()
axes = fig.add_subplot(1,1,1)
axe...
Android: how to check if a View inside of ScrollView is visible?
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Use View#getHitRect instead of View#getDrawingRect on the view you're testing. You can use View#getDrawingRect on the ScrollView instead of calculating explicitly.
Code from View#getDrawingRect:
public void getDrawingRect(Rect outRect) {
outRect.left = mScrollX;
outRect.top =...
How to gracefully handle the SIGKILL signal in Java
... event, such as user logoff or system shutdown.
I tried the following test program on OSX 10.6.3 and on kill -9 it did NOT run the shutdown hook, as expected. On a kill -15 it DOES run the shutdown hook every time.
public class TestShutdownHook
{
public static void main(String[] args) thro...
What should I set JAVA_HOME environment variable on macOS X 10.6?
...for me is simply put in
$ export JAVA_HOME=$(/usr/libexec/java_home)
To test whether it works, put in
$ echo $JAVA_HOME
it shows
/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
you can also test
$ which java
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