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Get object by id()? [duplicate]
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If the object is still there, this can be done by ctypes:
import ctypes
a = "hello world"
print ctypes.cast(id(a), ctypes.py_object).value
output:
hello world
If you don't know whether the object is still there, this is a recipe for undefined behavior and weird ...
Can't push to GitHub because of large file which I already deleted
...~<HOWEVER MANY COMMITS YOU WERE BEHIND>
So, for the example above, one would type:
git reset HEAD~2
After you typed that, your "git status" should say:
On branch master
Your branch is up to date with 'origin/master'.
nothing to commit, working tree clean
From there, you can delete the...
How to determine if a list of polygon points are in clockwise order?
...l in the case of a non-convex polygon, such as a crescent. Here's a simple one that will work with non-convex polygons (it'll even work with a self-intersecting polygon like a figure-eight, telling you whether it's mostly clockwise).
Sum over the edges, (x2 − x1)(y2 + y1). If the result is positi...
Batch file to copy directories recursively
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Doesn't /E imply /S? copy subdirectories, including Empty ones.
– mbomb007
May 11 '16 at 19:32
4
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When and why are database joins expensive?
...d water.
Chris Date, who in company with Dr Ted Codd was the original proponent of the relational data model, ran out of patience with misinformed arguments against normalisation and systematically demolished them using scientific method: he got large databases and tested these assertions.
I thin...
JavaScript: What are .extend and .prototype used for?
...end the prototypes of objects such as Date, Math, and even your own custom ones.
Date.prototype.lol = function() {
alert('hi');
};
( new Date ).lol() // alert message
In the snippet above, I define a method for all Date objects ( already existing ones and all new ones ).
extend is usually a h...
MVC4 StyleBundle not resolving images
...o absolute paths within a virtual directory, so this may not work for everyone (?).
bundles.Add(new StyleBundle("~/Content/css/jquery-ui/bundle")
.Include("~/Content/css/jquery-ui/*.css",
new CssRewriteUrlTransform()));
...
Automatic Retina images for web sites
... Also, no double loading is a huge boon. This means you never waste anyone's bandwidth.
– andrewb
Apr 18 '16 at 3:05
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Collections.emptyMap() vs new HashMap()
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+1 for the Effective Java reference. One nit: I would recommend parameterizing Set and HashSet in your examples, since the whole point of the emptySet() method and friends (as opposed to the constants Collections.EMPTY_SET etc.) is that they play nicely with gen...
sendmail: how to configure sendmail on ubuntu? [closed]
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One thing that isn't clear is what replacements to make in AuthInfo:your.isp.net "U:root" "I:user" "P:password" Specifically, how do you replace U:root and I:user
– Tom Haws
Aug 29 '13 ...