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Difference between JSON.stringify and JSON.parse
...that JSON text in a string, eg:
var my_object = { key_1: "some text", key_2: true, key_3: 5 };
var object_as_string = JSON.stringify(my_object);
// "{"key_1":"some text","key_2":true,"key_3":5}"
typeof(object_as_string);
// "string"
JSON.parse turns a string of JSON text into a JavaScri...
正则表达式 30 分钟入门教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...明作者以及来源。
正则表达式30分钟入门教程
版本：v2.31 (2009-4-11) 作者：deerchao 转载请注明来源
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LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria
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edited Mar 4 '19 at 15:22
Wai Ha Lee
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answer...
Cannot find module cv2 when using OpenCV
...Raspberry Pi, using jayrambhia's script found here . It installed version 2.4.5.
17 Answers
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Creating a dictionary from a csv file?
...ict = {rows[0]:rows[1] for rows in reader}
Alternately, for python <= 2.7.1, you want:
mydict = dict((rows[0],rows[1]) for rows in reader)
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Filter LogCat to get only the messages from My Application in Android?
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Better way to shuffle two numpy arrays in unison
...ssume the arrays a and b look like this:
a = numpy.array([[[ 0., 1., 2.],
[ 3., 4., 5.]],
[[ 6., 7., 8.],
[ 9., 10., 11.]],
[[ 12., 13., 14.],
[ 15., 16., 17.]]])
b = numpy.array([[ 0., ...
Is calculating an MD5 hash less CPU intensive than SHA family functions?
Is calculating an MD5 hash less CPU intensive than SHA-1 or SHA-2 on "standard" laptop x86 hardware? I'm interested in general information, not specific to a certain chip.
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How do you see the entire command history in interactive Python?
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answered Jul 2 '11 at 18:28
Ignacio Vazquez-AbramsIgnacio Vazquez-Abrams
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What is the Simplest Way to Reverse an ArrayList?
...ArrayList();
//Add elements to ArrayList object
aList.add("1");
aList.add("2");
aList.add("3");
aList.add("4");
aList.add("5");
Collections.reverse(aList);
System.out.println("After Reverse Order, ArrayList Contains : " + aList);
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