Loading modules with Python
Python is well suited to building a loader system. Despite being classified as a very high-level language (and not a mid-level language like C), Python has a lot of control over how it manages its own internals. The existence of robust module introspection built into Python was very useful for Salt, as it made the arbitrary loading of virtual modules at runtime a very smooth operation.
Each Salt module can support a function called __virtual__(). This is the function that detects whether or not a module will be made available to Salt on that system.
When the salt-minion service loads, it will go through each module, looking for a __virtual__() function. If none is found, then the module is assumed to have all of its requirements ...
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