4 The global dictionary SD is available to store private data between
5 repeated calls to the same function. The global dictionary GD is public
6 data, that is available to all Python functions within a session; use
9 Each function gets its own execution environment in the Python
10 interpreter, so that global data and function arguments from myfunc are
11 not available to myfunc2. The exception is the data in the GD
12 dictionary, as mentioned above.