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What does |= (ior) do in Python?
...s1 |= s2 # 2
>>> s1.__ior__(s2) # 3
where the final value of s1 is equivalent either by:
an assigned OR operation
an in-place OR operation
an in-place OR operation via special method++
Example
Here we a...
Missing include “bits/c++config.h” when cross compiling 64 bit program on 32 bit in Ubuntu
...
While compiling in RHEL 6.2 (x86_64), I installed both 32bit and 64bit libstdc++-dev packages, but I had the "c++config.h no such file or directory" problem.
Resolution:
The directory /usr/include/c++/4.4.6/x86_64-redhat-linux was missing.
I did the foll...
Suppressing deprecated warnings in Xcode
...ry -Wno-deprecated-declarations, or its corresponding setting in Xcode, GCC_WARN_ABOUT_DEPRECATED_FUNCTIONS (pro tip: just type in "deprecated" in the build settings to find the specific setting for this warning).
Current versions of Xcode (e.g. Xcode 9.2):
Ancient versions of Xcode (e.g. Xcod...
联网 App 第 1 课：连通测试，把一句话存到服务器再读回来（附 .aia 源码）...
...设置的属性
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文本输入框_地址
提示：如 http://192.168.1.19:5000/3f9a1c7e
按钮
按钮_保存地址
文本：保存
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字号 12
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How can I quantify difference between two images?
...ead images as 2D arrays (convert to grayscale for simplicity)
img1 = to_grayscale(imread(file1).astype(float))
img2 = to_grayscale(imread(file2).astype(float))
# compare
n_m, n_0 = compare_images(img1, img2)
print "Manhattan norm:", n_m, "/ per pixel:", n_m/img1.size
print "Z...
How do I install cygwin components from the command line?
...tended setup mode').
(Note that you need to use setup-x86.exe or setup-x86_64.exe as appropriate.)
See http://cygwin.com/packages/ for the package list.
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Add Foreign Key to existing table
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To add a foreign key (grade_id) to an existing table (users), follow the following steps:
ALTER TABLE users ADD grade_id SMALLINT UNSIGNED NOT NULL DEFAULT 0;
ALTER TABLE users ADD CONSTRAINT fk_grade_id FOREIGN KEY (grade_id) REFERENCES grades(id);
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Can I find events bound on an element with jQuery?
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In modern versions of jQuery, you would use the $._data method to find any events attached by jQuery to the element in question. Note, this is an internal-use only method:
// Bind up a couple of event handlers
$("#foo").on({
click: function(){ alert("Hello") },
mous...
Swift Programming: getter/setter in stored property
...orarily wrong, you should wrap a computed property around it.
private var _foo:Int = 0
var foo:Int {
get {
return _foo
}
set {
if(newValue > 999) {
_foo = 999
} else {
_foo = newValue
}
}
}
Or:
private var _foo:Int = 0
va...
jQuery - replace all instances of a character in a string [duplicate]
...ike this example: for (i = 0; i <= 100; i++) { str = str.replace(/"_0x69b9[" + i.toString() + "]"/g, _array[i]); }
– SalmanShariati
Jan 15 '15 at 10:11
1
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