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Converting from a string to boolean in Python?
...ly', 'uh-huh']
Be cautious when using the following:
>>> bool("foo")
True
>>> bool("")
False
Empty strings evaluate to False, but everything else evaluates to True. So this should not be used for any kind of parsing purposes.
...
Should I initialize variable within constructor or outside constructor [duplicate]
...FYI other option's for initialization without using a constructor :
class Foo
{
int i;
static int k;
//instance initializer block
{
//run's every time a new object is created
i=20;
}
//static initializer block
static{
//run's only one time when ...
How do I clone a Django model instance object and save it to the database?
...
Just change the primary key of your object and run save().
obj = Foo.objects.get(pk=<some_existing_pk>)
obj.pk = None
obj.save()
If you want auto-generated key, set the new key to None.
More on UPDATE/INSERT here.
Official docs on copying model instances: https://docs.djangoproje...
The most accurate way to check JS object's type?
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@jamietre because "foo" instanceof String breaks
– Raynos
Oct 25 '11 at 18:58
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How to check whether a given string is valid JSON in Java
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I've tried a json string like "{'hello':'foo'} 'invalid'" (added 'invalid' outside the {}), and JSONObject is not throwing ParseException. I am using org.json.JSONObject. Is this expected?
– Soichi Hayashi
Aug 21 '14 at 22:40
...
Android global variable
... like so:
// set
((MyApplication) this.getApplication()).setSomeVariable("foo");
// get
String s = ((MyApplication) this.getApplication()).getSomeVariable();
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Determine installed PowerShell version
...ing different version (invoke-command -computername myRemotePC -Credential foo {$host}), it looks like $host will just show the lowest version they agreed upon for serializing. While $PSVersionTable will show the true version. Hope it would help someone..
– vulcan raven
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How to structure a express.js application?
Is there a common convention for breaking up and modularizing the app.js file in an Express.js application? Or is it common to keep everything in a single file?
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How to create a tag with Javascript?
...;
})();
}
You can add external files via
document.createStyleSheet('foo.css');
and dynamically create rules via
var sheet = document.createStyleSheet();
sheet.addRule('h1', 'background: red;');
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Create empty queryset by default in django form fields
...2':value2})
form.fields['field3'].queryset = YourModel.objects.filter('foo'=bar)
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