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What does the “at” (@) symbol do in Python?
...zza(object):
def __init__(self):
self.toppings = []
def __call__(self, topping):
# When using '@instance_of_pizza' before a function definition
# the function gets passed onto 'topping'.
self.toppings.append(topping())
def __repr__(self):
return ...
List of tables, db schema, dump etc using the Python sqlite3 API
...e';
job
t1
t2
snmptarget
t3
sqlite> .schema job
CREATE TABLE job (
id INTEGER PRIMARY KEY,
data VARCHAR
);
sqlite> select sql from sqlite_master where type = 'table' and name = 'job';
CREATE TABLE job (
id INTEGER PRIMARY KEY,
data VARCHAR
)
...
Matplotlib discrete colorbar
...re clear. You can solve this problem by changing the limits of the matshow call:
import matplotlib.pyplot as plt
import numpy as np
def discrete_matshow(data):
#get discrete colormap
cmap = plt.get_cmap('RdBu', np.max(data)-np.min(data)+1)
# set limits .5 outside true range
mat = p...
How to create a new object instance from a Type
...
Glad to have finally found this, but second call is not exactly right, missing a quote and parms reversed, should be: ObjectType instance = (ObjectType)Activator.CreateInstance("MyAssembly","MyNamespace.ObjectType");
– kevinc
Jun ...
Align contents inside a div
I use css style text-align to align contents inside a container in HTML. This works fine while the content is text or the browser is IE. But otherwise it does not work.
...
Why should I use a pointer rather than the object itself?
... with automatic storage duration, which means it will be destroyed automatically when it goes out of scope. When you do new Object(), the object has dynamic storage duration, which means it stays alive until you explicitly delete it. You should only use dynamic storage duration when you need it.
Th...
Getting the name of the currently executing method
...d.currentThread().getStackTrace() will usually contain the method you’re calling it from but there are pitfalls (see Javadoc):
Some virtual machines may, under some circumstances, omit one or more stack frames from the stack trace. In the extreme case, a virtual machine that has no stack trace...
What is an undefined reference/unresolved external symbol error and how do I fix it?
...g token is converted into a token. (2.7). The
resulting tokens are syntactically and semantically analyzed and
translated as a translation unit. [SNIP]
Translated translation units and instantiation units are combined as follows: [SNIP]
All external entity references are resolved. Library components...
jQuery - Trigger event when an element is removed from the DOM
...)
Addendum to answer Pierre and DesignerGuy's comments:
To not have the callback fire when calling $('.thing').off('destroyed'), change the if condition to: if (o.handler && o.type !== 'destroyed') { ... }
share
...
Using Default Arguments in a Function
... = "some other value";
}
code here!
}
This way, you can make a call like foo('blah', null, 'non-default y value'); and have it work as you want, where the second parameter $x still gets its default value.
With this method, passing a null value means you want the default value for one pa...