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What's the difference between the Dependency Injection and Service Locator patterns?
...ss is given its dependencies. It neither knows, nor cares where they come from. One important result of this is that the DI example is much easier to unit test -- because you can pass it mock implementations of its dependent objects. You could combine the two -- and inject the service locator (or...
Setting PayPal return URL and making it auto return?
...return in your PayPal account, otherwise it will ignore the return field.
From the documentation (updated to reflect new layout Jan 2019):
Auto Return is turned off by default.
To turn on Auto Return:
Log in to your PayPal account at https://www.paypal.com or https://www.sandbox.paypa...
Comparing Java enum members: == or equals()?
...out the order of your arguments (which only applies to comparing constants from the left, as in Pascal's answer)? Do you like always checking that a value is not null before .equals()ing it? I know I don't.
– Matt Ball
Nov 17 '09 at 21:03
...
Detecting input change in jQuery?
...g into a text field, pasting, undoing, basically anytime the value changed from one value to another.
In jQuery do that like this
$('#someInput').bind('input', function() {
$(this).val() // get the current value of the input field.
});
starting with jQuery 1.7, replace bind with on:
$('#so...
How to use Class in Java?
... Static method always needs explicit <T> declaration; It wont derive from class level Class<T>. This is because of Class level T is bound with instance.
Also read Restrictions on Generics
Wildcards and Subtyping
type argument for a generic method
...
How to Define Callbacks in Android?
...ires me to edit the source path on it. So how would i carry out "callBack" from an old activity to a new activity?
– Antoine Murion
Apr 20 '15 at 8:41
3
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How to close this ssh tunnel? [closed]
... of the command:
ssh: that's pretty self-explanatory. Invokes ssh.
-f: (From the man ssh page)
Requests ssh to go to background just before command execution.
This is useful if ssh is going to ask for passwords or
passphrases, but the user wants it in the background.
E...
Inline labels in Matplotlib
...e for a label
Label should be near corresponding line
Label should be away from the other lines
The code was something like this:
import matplotlib.pyplot as plt
import numpy as np
from scipy import ndimage
def my_legend(axis = None):
if axis == None:
axis = plt.gca()
N = 32
...
Determine if Python is running inside virtualenv
....base_prefix is the prefix of the system Python the virtualenv was created from.
The above always works for Python 3 stdlib venv and for recent virtualenv (since version 20). Older versions of virtualenv used sys.real_prefix instead of sys.base_prefix (and sys.real_prefix did not exist outside a vir...
Is there a label/goto in Python?
...
Using exceptions to do stuff like this may feel a bit awkward if you come from another programming language. But I would argue that if you dislike using exceptions, Python isn't the language for you. :-)
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