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Using a dictionary to count the items in a list [duplicate]
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in 2.7 and 3.1 there is special Counter dict for this purpose.
>>> from collections ...
How to find Unused Amazon EC2 Security groups
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Note: this only considers security use in EC2, not other services like RDS. You'll need to do more work to include security groups used outside EC2. The good thing is you can't easily (might not even be possible) to delete active security groups if you miss one asso...
How to create a MySQL hierarchical recursive query
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For MySQL 8+: use the recursive with syntax.
For MySQL 5.x: use inline variables, path IDs, or ...
Using Java to find substring of a bigger string using Regular Expression
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Is it possible to modify variable in python that is in outer, but not global, scope?
... think this does what you want, but I'm not sure if you are running python 2 or 3.
The nonlocal statement causes the listed identifiers to refer to
previously bound variables in the nearest enclosing scope. This is
important because the default behavior for binding is to search the
local n...
Best introduction to C++ template metaprogramming? [closed]
...Applications by Krzysztof Czarnecki and Ulrich W. Eisenecker, ISBN-13: 9780201309775; and chapter 17, "Metaprograms" of C++ Templates: The Complete Guide by David Vandevoorder and Nicolai M. Josuttis, ISBN-13: 9780201734843.
Todd Veldhuizen has an excellent tutorial here.
A good resource for ...
How to do version numbers? [closed]
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[major].[minor].[release].[build]
major: Really a marketing decision. Are you ready to call t...
使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网
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使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE)
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使用 MIT App Inventor 控制低功耗蓝牙设备
本文介绍了用于低功耗蓝牙 (BLE) 设备的 App Inve...
XPath query to get nth instance of an element
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