大约有 15,500 项符合查询结果（耗时：0.0874秒） [XML]
How to list all installed packages and their versions in Python?
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WOW: Just looked into documentation of latest version of pip and seems like they have added pip list: pip-installer.org/en/latest/usage.html#pip-list - so this is actually something that is coming already!
– jsalonen
Feb 9 '13 ...
How to get current CPU and RAM usage in Python?
...s more concepts and interest concepts:
https://psutil.readthedocs.io/en/latest/
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Expand Python Search Path to Other Source
...ample:
PYTHONPATH=$PYTHONPATH:$HOME/adaifotis/project
In addition to testing your PYTHONPATH environment variable, as David explains, you can test it in python like this:
$ python
>>> import project # should work if PYTHONPATH set
>>> import sys
>>...
What are the disadvantages of using persistent connection in PDO
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On my tests I had a connection time of over a second to my localhost, thus assuming I should use a persistent connection. Further tests showed it was a problem with 'localhost':
Test results in seconds (measured by php microtime):...
Better way to cast object to int
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Use Int32.TryParse as follows.
int test;
bool result = Int32.TryParse(value, out test);
if (result)
{
Console.WriteLine("Sucess");
}
else
{
if (value == null) value = "";
Console.WriteLine("Failure");
}
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Does Internet Explorer 8 support HTML 5?
... var div = document.createElement('div'); div.innerHTML = '<section>test</section>'; We end up with div.childNodes.length = 2. I ran into the problem using jQuery and have been trying to figure out what's going on in IE.
– Nick Spacek
Feb 23 '10 a...
How to change string into QString?
...ng str("hello !");
qDebug() << QVariant(str.c_str()).toString();
int test = 10;
double titi = 5.42;
qDebug() << QVariant(test).toString();
qDebug() << QVariant(titi).toString();
qDebug() << QVariant(titi).toInt();
output
"hello !"
"10"
"5.42"
5
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Use dynamic variable names in JavaScript
...type from your example, if you have its name in another variable: function test(vname) { var type = 'article'; this[vname] = 'something else'; alert(type); }; test('type') will show article, not something else. And that is what the "complex answer" explains.
– Orafu
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How can I check for NaN values?
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The usual way to test for a NaN is to see if it's equal to itself:
def isNaN(num):
return num != num
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Why does the jquery change event not trigger when I set the value of a select using val()?
...x up with default change event you can provide your custom event
$('input.test').on('value_changed', function(e){
console.log('value changed to '+$(this).val());
});
to trigger the event on value set, you can do
$('input.test').val('I am a new value').trigger('value_changed');
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