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How to install PyQt4 on Windows using pip?
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In the filenames cp27 means C-python version 2.7, cp35 means python 3.5, etc.
Since Qt is a more complicated system with a compiled C++ codebase underlying the python interface it provides you, it can be more complex to build than just a pure python code package, which means it can be hard to ins...
What is the best way to create constants in Objective-C
...stants. Things like serial identifier numbers, bit-masks, four-byte codes, etc.
For those purposes, enum is great and you absolutely should use it. (Even better, use the NS_ENUM and NS_OPTIONS macros.) For other things, you must use something else; enum does not do anything but integers.
And other...
WiX tricks and tips
... (except Config.wxi) from existing project.
Create Setup.Live, Setup.Test, etc as per normal wixproj.
Add BeforeBuild target in wixproj in Setup.Live, etc to perform MSBuild Community Task FileUpdate to modify Guids (I used A for Live, B for Test and C for training)
Add AfterBuild target to revert C...
Pick a random element from an array
...l the scalar data types you might want expect: Int, Double, Float, UInt32, etc. And it lets you provide target ranges for the values. Very handy. You can use array[Int.random(0..<array.count)]` in Swift 4.2
– Duncan C
Sep 19 '18 at 18:30
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Python argparse mutual exclusive group
...y of potential conflicts (a can't occur with b or c, b can't occur with a, etc), and then raises an error if a conflict arises.
Without that argparse patch, I think your best choice is to test the namespace produced by parse_args yourself (e.g. if both a and b have nondefault values), and raise you...
JSON serialization of Google App Engine models
...,
'title': self.title,
'date_taken': date_taken.isoformat(),
# etc.
})
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Shell script while read line loop stops after the first line
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while read host ; do $host do_something ; done < /etc/hosts would avoid it. That's quite a life saver, thanks!
– rat
Jul 19 '19 at 15:09
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“Variable” variables in Javascript?
... array could be defined automatically via an input, database query, event, etc.
elements.forEach( (element) => {
elementIds[element] = document.getElementById(element);
});
This example declares variable variables (keys in elementIds) based on the ID of each element,...
What is the difference between typeof and instanceof and when should one be used vs. the other?
...have different built-ins (different global object, different constructors, etc.). This may result in unexpected results.
For example, [] instanceof window.frames[0].Array will return false, because Array.prototype !== window.frames[0].Array and arrays inherit from the former.
Also, it cannot be us...
Calling async method synchronously
...sulting product is also library and can be used anywhere including ASP.NET etc.
– dimzon
Oct 12 '15 at 23:24
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