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Virtual Memory Usage from Java under Linux, too much memory used
... a long-standing complaint with Java, but it's largely meaningless, and usually based on looking at the wrong information. The usual phrasing is something like "Hello World on Java takes 10 megabytes! Why does it need that?" Well, here's a way to make Hello World on a 64-bit JVM claim to take over 4...
get and set in TypeScript
...
})();
So to use it,
var myFoo = new foo();
if(myFoo.bar) { // calls the getter
myFoo.bar = false; // calls the setter and passes false
}
However, in order to use it at all, you must make sure the TypeScript compiler targets ECMAScript5. If you are running the command line compile...
How do I check if there are duplicates in a flat list?
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Use set() to remove duplicates if all values are hashable:
>>> your_list = ['one', 'two', 'one']
>>> len(your_list) != len(set(your_list))
True
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What is the worst gotcha in C# or .NET? [closed]
...return MyVar; }
}
Blammo. Your app crashes with no stack trace. Happens all the time.
(Notice capital MyVar instead of lowercase myVar in the getter.)
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What is the best method to merge two PHP objects?
...bj_merged = (object) array_merge((array) $obj1, (array) $obj2);
This actually also works when objects have methods. (tested with PHP 5.3 and 5.6)
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How do I find the location of my Python site-packages directory?
...ib"])'
The per user site-packages directory (PEP 370) is where Python installs your local packages:
python -m site --user-site
If this points to a non-existing directory check the exit status of Python and see python -m site --help for explanations.
Hint: Running pip list --user or pip freeze -...
How to step through Python code to help debug issues?
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Yes! There's a Python debugger called pdb just for doing that!
You can launch a Python program through pdb by using pdb myscript.py or python -m pdb myscript.py.
There are a few commands you can then issue, which are documented on the pdb page.
Some usef...
External template in Underscore
...nstead.
I wouldn't advocate doing this anymore. Instead, I would separate all templates into individual HTML files. Some would suggest loading these asynchronously (Require.js or a template cache of sorts). That works well on small projects but on large projects with lots of templates, you find y...
SQLAlchemy: cascade delete
...use that is where you defined your relationship (it doesn't care that you called it "Child" of course).
If you define the relationship on the Parent class instead, it will work:
children = relationship("Child", cascade="all,delete", backref="parent")
(note "Child" as a string: this is allowed wh...
In a Django form, how do I make a field readonly (or disabled) so that it cannot be edited?
...hanged his example to work with Django 1.3, using get_readonly_fields.
Usually you should declare something like this in app/admin.py:
class ItemAdmin(admin.ModelAdmin):
...
readonly_fields = ('url',)
I've adapted in this way:
# In the admin.py file
class ItemAdmin(admin.ModelAdmin):
...