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Django templates: verbose version of a choice
...an use the "get_FOO_display()" method, that will return the readable alias for the field, where 'FOO' is the name of the field.
Note: in case the standard FormPreview templates are not using it, then you can always provide your own templates for that form, which will contain something like {{ form....
Use 'import module' or 'from module import'?
...odule you have to update your import statement
You lose context about foo. For example, it's less clear what ceil() does compared to math.ceil()
Either method is acceptable, but don't use from module import *.
For any reasonable large set of code, if you import * you will likely be cementing i...
MySQL - length() vs char_length()
... length of the string measured in characters.
This is especially relevant for Unicode, in which most characters are encoded in two bytes. Or UTF-8, where the number of bytes varies. For example:
select length(_utf8 '€'), char_length(_utf8 '€')
--> 3, 1
As you can see the Euro sign occup...
Compare two DataFrames and output their differences side-by-side
...egardless of the value of the index. JFYI in case I'm not the only person for which this wasn't obvious. ;D Thanks!
– dmn
May 19 '15 at 15:56
12
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Call a “local” function within module.exports from another function in module.exports?
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module.exports.foo() and exports.foo() do not work for me with Node.js v5.8.0.
– betweenbrain
Jul 15 '16 at 15:35
14
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How to sign an android apk file
... a small overview without reference or eclipse around, so leave some space for errors, but it works like this
Open your project in eclipse
Press right-mouse - > tools (android tools?) - > export signed application (apk?)
Go through the wizard:
Make a new key-store. remember that password
Sig...
__declspec(dllexport) 导出符号解决链接失败问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
__declspec(dllexport) 导出符号解决链接失败问题特别注意：dllexport、dllimport导出、导入的方式仅针对dll动态库，而lib静态库无需任何申明，宏全部替换成空即可。error LNK2019: 无法解析的外部符号 "public: __thiscall CBtt::CBtt(void)" (??0CBtt@@Q...
Unexpected results when working with very big integers on interpreted languages
...
Python works:
>>> sum(x for x in xrange(1000000000 + 1))
500000000500000000
Or:
>>> sum(xrange(1000000000+1))
500000000500000000
Python's int auto promotes to a Python long which supports arbitrary precision. It will produce the correc...
Globally catch exceptions in a WPF application?
...
Use the Application.DispatcherUnhandledException Event. See this question for a summary (see Drew Noakes' answer).
Be aware that there'll be still exceptions which preclude a successful resuming of your application, like after a stack overflow, exhausted memory, or lost network connectivity while...
Inversion of Control vs Dependency Injection
... the framework calls implementations provided by the application.
DI is a form of IoC, where implementations are passed into an object through constructors/setters/service lookups, which the object will 'depend' on in order to behave correctly.
IoC without using DI, for example would be the Templa...