arrayfrombuffer allows a programmer to use Numerical Python arrays whose contents are stored in buffer objects, including memory-mapped files. Loading an array from a file is easy, requiring only a module import and a single function call. Loading the array is quick because it doesn't require any copying from one part of memory to another. Arrays created with arrayfrombuffer are also highly memory-efficient, since only the array data that you are currently using gets loaded into memory. When an array is modified, only the modified parts get written back out to disk. These arrays can also be bigger than physical memory.
JEnable gives an easy way of controlling different build options within Java source code. It allows you to maintain and distribute a single set of source files which can support multiple configurations. The program can be executed from various types of build scripts (including Ant scripts) to automatically change the source configuration on demand. To accomplish this it uses control information embedded in Java code as comment lines with a special format.