12.8. Other Features of Modules
12.8.1. Auto-loaded Modules
When the Python interpreter starts up in standard mode, some modules are loaded by the interpreter for system use. The only one that affects you is the __builtin__ module, which normally gets loaded in as the __builtins__ module.
The sys.modules variable consists of a dictionary of modules that the interpreter has currently loaded (in full and successfully) into the interpreter. The module names are the keys, and the location from which they were imported are the values.
For example, in Windows, the sys.modules variable contains a large number of loaded modules, so we will shorten the list by requesting only the module names. This is accomplished by using the dictionary's keys() method: ...
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