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How to set a Django model field's default value to a function call / callable (e.g., a date relative
... to create a field in the class.
PRE Django 1.7
Django lets you pass a callable as the default, and it will invoke it each time, just as you want:
from datetime import datetime, timedelta
class MyModel(models.Model):
# default to 1 day from now
my_date = models.DateTimeField(default=lambda: ...
Tracking Google Analytics Page Views with AngularJS
...cs does not count it as a new page load. Fortunately there is a way to manually tell GA to log a url as a new pageview.
_gaq.push(['_trackPageview', '<url>']); would do the job, but how to bind that with AngularJS?
Here is a service which you could use:
(function(angular) {
angular.modu...
Django: How to manage development and production settings?
...s you define environment variables in an "environment" (.env) file.
Finally, note that you can take advantage of the PYTHONPATH variable to store the settings in a completely different location (e.g. on a production server, storing them in /etc/). This allows for separating configuration from ap...
How do I print the type or class of a variable in Swift?
...y<String>.self)")
Which outputs:
String(myvar0.dynamicType) -> __NSCFConstantString
String(myvar1.dynamicType) -> PureSwiftClass
String(myvar2.dynamicType) -> Int
String(myvar3.dynamicType) -> String
String(Int.self) -> Int
String((Int?).self -> Optional&...
Deep Learning（深度学习）学习笔记整理系列之（二） - 大数据 & AI - 清泛...
Deep Learning（深度学习）学习笔记整理系列之（二）Deep_Learning_Series_2Deep Learning（深度学习）学习笔记整理系列zouxy09@qq.comhttp: blog.csdn.net zouxy09作者：Zouxyversion 1.0 2013-04-08原文网址：h...Deep Learning（深度学习）学习笔记整理系列
zo...
Deep Learning（深度学习）学习笔记整理系列之（二） - 大数据 & AI - 清泛...
Deep Learning（深度学习）学习笔记整理系列之（二）Deep_Learning_Series_2Deep Learning（深度学习）学习笔记整理系列zouxy09@qq.comhttp: blog.csdn.net zouxy09作者：Zouxyversion 1.0 2013-04-08原文网址：h...Deep Learning（深度学习）学习笔记整理系列
zo...
Programmatically change the src of an img tag
...ng an image src (especial when you're using elements that have IDs), you really should try to avoid jQuery, since the call is so much slower than the pure JS call
– Brian Leishman
Apr 8 '15 at 13:36
...
adding x and y axis labels in ggplot2
...You can set the labels with xlab() and ylab(), or make it part of the scale_*.* call.
library("Sleuth2")
library("ggplot2")
ggplot(ex1221, aes(Discharge, Area)) +
geom_point(aes(size=NO3)) +
scale_size_area() +
xlab("My x label") +
ylab("My y label") +
ggtitle("Weighted Scatterplot of W...
Random strings in Python
...
In many cases, random isn't really required. Rather, all you really need is unique.
– Chase Seibert
Jan 8 '10 at 19:48
1
...
std::wstring VS std::string
... on a wchar_t.
char vs. wchar_t
char is supposed to hold a character, usually an 8-bit character.
wchar_t is supposed to hold a wide character, and then, things get tricky:
On Linux, a wchar_t is 4 bytes, while on Windows, it's 2 bytes.
What about Unicode, then?
The problem is that neither char ...