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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
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302
Generically, a covariant type parameter is one which is allowed to vary down as the class is su...
Rails 3: Get Random Record
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edited May 4 '17 at 19:09
answered Mar 17 '11 at 16:45
f...
Difference between Destroy and Delete
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answered Mar 31 '14 at 9:03
user740584user740584
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How do I script a “yes” response for installing programs?
...s"?
– Nathan Basanese
Dec 9 '15 at 10:16
1
Be careful with yes as it is known to max out the CPU....
Convert list to tuple in Python
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30
You might have done something like this:
>>> tuple = 45, 34 # You used `tuple` as a v...
Set cookie and get cookie with JavaScript [duplicate]
... var date = new Date();
date.setTime(date.getTime() + (days*24*60*60*1000));
expires = "; expires=" + date.toUTCString();
}
document.cookie = name + "=" + (value || "") + expires + "; path=/";
}
function getCookie(name) {
var nameEQ = name + "=";
var ca = document...
Are multiple `.gitignore`s frowned on?
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answered Jul 22 '10 at 9:01
Jakub NarębskiJakub Narębski
254k5858 gold badges205205 silver badges227227 bronze badges
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why is plotting with Matplotlib so slow?
...ort matplotlib.pyplot as plt
import numpy as np
import time
x = np.arange(0, 2*np.pi, 0.01)
y = np.sin(x)
fig, axes = plt.subplots(nrows=6)
styles = ['r-', 'g-', 'y-', 'm-', 'k-', 'c-']
lines = [ax.plot(x, y, style)[0] for ax, style in zip(axes, styles)]
fig.show()
tstart = time.time()
for i in ...
What kind of leaks does automatic reference counting in Objective-C not prevent or minimize?
...e-C mailing list, where he lists many advantages of ARC over Objective-C 2.0 garbage collection. I've run into several of the GC issues he describes.
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App Inventor 2 CirculBar 扩展：在图像组件上绘制自定义圆形进度条 · App Inventor 2 中文网
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进度值
number
进度百分比值，如 50 表示 50%
文字颜色
color
中间百分比文字的颜色，支持颜色名称（如 red、white）或 16 进制值（如 #ed1414f3）
进度条...