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Better way to check variable for null or empty string?
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// Function for basic field validation (present and neither empty nor only white space
function IsNullOrEmptyString($str){
return (!isset($str) || trim($str) === '');
}
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Loaded nib but the 'view' outlet was not set
I added a new nib file to my project, and tried to load it.
32 Answers
32
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Instance variables vs. class variables in Python
...time, so it would be sufficient to have the attributes only once per class and not per instance. If there would be more than one instance (which won't happen), all instance should have the same configuration. I wonder which of the following options would be better or more "idiomatic" Python.
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cd into directory without having permission
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Enter super user mode, and cd into the directory that you are not permissioned to go into. Sudo requires administrator password.
sudo su
cd directory
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YAML Multi-Line Arrays
...['string1', 'string2', 'string3',
'string4', 'string5',
'string6']
and even have multi-line strings in single-line arrays:
key: ['string1', 'long
string', 'string3', 'string4', 'string5', 'string6']
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postgresql: INSERT INTO … (SELECT * …)
I'm not sure if its standard SQL:
6 Answers
6
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Recursive file search using PowerShell
...ntinue -fo -inc "filename.txt" | % { $_.fullname }
– Andrew
Nov 4 '17 at 7:34
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How to include a quote in a raw Python string
...oted strings in your string (an extremely unlikely case), you can't do it, and you'll have to use non-raw strings with escapes.
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Real life trading API [closed]
...ems -- see this.
Also, this is something that the exchange has to support and your broker has to allow. Most exchanges I know of, do not allow automated trading without prior permission.
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CSS3 transform not working
... My CSS works in Firefox but I've failed to replicate the effect in Chrome and Safari. I know IE doesn't support this CSS3 property so that's not a problem.
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