大约有 15,482 项符合查询结果（耗时：0.0260秒） [XML]
Get a specific bit from byte
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This is the fastest method.
– Adam Calvet Bohl
May 30 '18 at 11:26
add a comment
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One-liner to check whether an iterator yields at least one element?
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This seems to work for me, with a re.finditer. You can test that any stops at first success easily: run any((x > 100 for x in xrange(10000000))) and then run any((x > 10000000 for x in xrange(100000000))) -- the second should take much longer.
– chbrow...
What is a elegant way in Ruby to tell if a variable is a Hash or an Array?
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If you want to test if an object is strictly or extends a Hash, use:
value = {}
value.is_a?(Hash) || value.is_a?(Array) #=> true
But to make value of Ruby's duck typing, you could do something like:
value = {}
value.respond_to?(:[]) ...
Find out how much memory is being used by an object in Python [duplicate]
...the objects __sizeof__ might be misleading.
Using the bregman.suite, some tests with sys.getsizeof output a copy of an array object (data) in an object instance as being bigger than the object itself (mfcc).
>>> mfcc = MelFrequencyCepstrum(filepath, params)
>>> data = mfcc.X[:]
&...
How to get instance variables in Python?
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You can also test if an object has a specific variable with:
>>> hi_obj = hi()
>>> hasattr(hi_obj, "some attribute")
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Remove header and footer from window.print()
...s="http://www.w3.org/1999/xhtml">
<head>
<title>Print Test</title>
<style type="text/css" media="print">
@page
{
size: auto; /* auto is the current printer page size */
margin: 0mm; /* this affects the margin in th...
“Unable to find remote helper for 'https'” during git clone
...PS repositories. I can clone SSH repos fine, but not HTTPS repos. I cannot test the GIT protocol since I am behind a corporate firewall.
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returning in the middle of a using block
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The code bellow shows how using is working:
private class TestClass : IDisposable
{
private readonly string id;
public TestClass(string id)
{
Console.WriteLine("'{0}' is created.", id);
this.id = id;
}
public void Dispose()
{
Console.WriteLine("...
How to extract URL parameters from a URL with Ruby or Rails?
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I haven't tested this, but the first key listed, containing the full url, seems really wrong.
– Levi
Mar 26 '10 at 4:14
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How to avoid 'cannot read property of undefined' errors?
... operator.
window.a = "aString";
//window should have 'a' property
//lets test if it exists
if ("a" in window){
//true
}
if ("b" in window){
//false
}
Of course you can nest this as deep as you want
if ("a" in window.b.c) { }
Not sure if this helps.
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