6.1. More on Modules A module can contain executable statements as well as function definitions. These statements are in

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6.1. More on Modules
A module can contain executable statements as well as function
definitions. These statements are intended to initialize the
module. They are executed only the first time
the module name is encountered in an import
statement. 1 (They are also run if the file is executed
as a script.)
Each module has its own private symbol table, which is used as
the global symbol table by all functions defined in the module.
Thus, the author of a module can use global variables in the module
without worrying about accidental clashes with a user’s global
variables. On the other hand, if you know what you are doing you
can touch a module’s global variables with the same notation used
to refer to its functions, modname.itemname.
Modules can import other modules. It is customary but not
required to place all import statements at the beginning
of a module (or script, for that matter). The imported module names
are placed in the importing module’s global symbol table.
There is a variant of the import statement that
imports names from a module directly into the importing module’s
symbol table. For example:
>>>
This does not introduce the module name from which the imports
are taken in the local symbol table (so in the
example, fibo is not defined).
There is even a variant to import all names that a module
defines:
>>>
This imports all names except those beginning with an underscore
(_). In most cases Python programmers do not use this facility
since it introduces an unknown set of names into the interpreter,
possibly hiding some things you have already defined.
Note that in general the practice of importing * from
a module or package is frowned upon, since it often causes poorly
readable code. However, it is okay to use it to save typing in
interactive sessions.
If the module name is followed by as, then the name
following as is bound directly to the imported
module.
>>>
This is effectively importing the module in the same way
that import fibo will do, with the only difference
of it being available as fib.
It can also be used when utilising from with similar
effects:
>>>