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Nested defaultdict of defaultdict
...gt;> x['a']['b']['c']['d']
defaultdict(<function rec_dd at 0x7f0dcef81500>, {})
>>> print json.dumps(x)
{"a": {"b": {"c": {"d": {}}}}}
Of course you could also do this with a lambda, but I find lambdas to be less readable. In any case it would look like this:
rec_dd = lambda: d...
How do you create nested dict in Python?
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answered Dec 7 '15 at 20:22
JunchenJunchen
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What does “The APR based Apache Tomcat Native library was not found” mean?
...ns exactly what it says: "The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path"
The library referred to is bundled into an OS specific dll (tcnative-1.dll) loaded via JNI. It allows tomcat to use OS functionali...
How to have the cp command create any necessary folders for copying a file to a destination [duplica
... the mkdir/cp command above. It just creates a single level of folder. Actually I'm not sure when it can be useful.
– Penghe Geng
Apr 13 '15 at 14:30
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How to iterate for loop in reverse order in swift?
...ough: 1, by: -1)
– Binarian
Sep 21 '15 at 9:23
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With Swift 3.0 we're back to stride as a free fu...
How to unit test an object with database queries
I've heard that unit testing is "totally awesome", "really cool" and "all manner of good things" but 70% or more of my files involve database access (some read and some write) and I'm not sure how to write a unit test for these files.
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Programmatically obtain the Android API level of a device?
... ICE_CREAM_SANDWICH Android 4.0 Ice Cream Sandwich
15 ICE_CREAM_SANDWICH_MR1 Android 4.0.3 Ice Cream Sandwich
16 JELLY_BEAN Android 4.1 Jellybean
17 JELLY_BEAN_MR1 Android 4.2 Jellybean
1...
Is there a read-only generic dictionary available in .NET?
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How to change the Push and Pop animations in a navigation based app
...t common, everyday transitions (such as an ordinary slide), you do have to all the work of implementing a full custom transition.
Here's how to do it ...
1. You need a custom UIViewControllerAnimatedTransitioning
You need a bool of your own like popStyle . (Is it popping on, or popping off?)
You m...
Fastest Way to Serve a File Using PHP
...erywhere.
Using the X-SendFile header
As documented by others it's actually the best way. The basis is that you do your access control in php and then instead of sending the file yourself you tell the web server to do it.
The basic php code is :
header("X-Sendfile: $file_name");
header("Conten...