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ruby operator “=~” [duplicate]
...
This operator matches strings against regular expressions.
s = 'how now brown cow'
s =~ /cow/ # => 14
s =~ /now/ # => 4
s =~ /cat/ # => nil
If the String matches the expression, the operator returns the offset, and if it doesn't, it returns nil. It's slightly more complicated than...
argparse: identify which subparser was used [duplicate]
...re', help='name of app to process')
app_parser.set_defaults(which='app')
Now if you run
print parser.parse_args(["all"])
The result is
Namespace(which='all')
Check out the add_subparsers() documentation for more information and another example.
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CSS values using HTML5 data attribute [duplicate]
I want to know if there's any way it's possible to set a css value using HTML5's data- attribute the same way that you can set css content . Currently it doesn't work.
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How to update Python?
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UPDATE: 2018-07-06
This post is now nearly 5 years old! Python-2.7 will stop receiving official updates from python.org in 2020. Also, Python-3.7 has been released. Check out Python-Future on how to make your Python-2 code compatible with Python-3. For upda...
Merging 2 branches together in GIT
... A
$ git checkout A
# hack hack
$ git commit -am "commit on branch A"
so now there are three separate branches (namely A B and C) with different heads
to get the changes from B and C back to A, checkout A (already done in this example) and then use the merge command:
# create an octopus merge
$ ...
What is the difference between a var and val definition in Scala?
...ge the state of that object. At the root of it, however, there was a var.
Now, immutability is a good thing for many reasons. First, if an object doesn't change internal state, you don't have to worry if some other part of your code is changing it. For example:
x = new B(0)
f(x)
if (x.value.value ...
ios simulator: how to close an app
... Q was asked you and was responded by @lehn0058 on Aug 29 '13 correctly, now to get easy upvotes, you accepted your answer and modified by copying his. Not a fare call at all. Atleast mention the deserving persons name.
– Nicks
Apr 27 '17 at 0:40
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What are the key differences between Meteor, Ember.js and Backbone.js? [closed]
Learning Ember.js / Backbone.js has been on my to-do list for a while. Now that Meteor is out, I am just wondering if anyone with experience of Meteor, Ember.js and Backbone.js can summarize the key differences and pros and cons of these three JavaScript frameworks for a person without any experie...
Should the hash code of null always be zero, in .NET
...m, either re-implement the hash code to return non-zero, add a default "unknown" enum entry equivalent to null, or simply don't use nullable enums.
Interesting find, by the way.
Another problem I see with this generally is that the hash code cannot represent a 4 byte or larger type that is nullabl...
Is using a lot of static methods a bad thing?
... Math object encapsulate anything but behaviour?
– JonoW
Apr 15 '09 at 17:22
10
He just said susp...