How create programmatically variables ?

[Gribouillis]

I've dig the WWW but I found only very old results that lead to create some Dictionary...

Variables in Python are kept in namespaces, which have a dictionary-like semantics. For example global variables in a module are kept in the globals() dictionary, which you could also access as vars(sys.modules[__name__]). You can update these dictionaries to create module-level variables.

Usually however, this is bad practice and it is better to use another dictionary that your program creates.

I see a good use case for this, which is lazy imports of subpackages in a package Spam:

# Spam.__init__.py

def __getattr__(name):
    from importlib import import_module
    submodule = import_module(name, __package__)
    globals()[name] = submodule
    return submodule

Now in client code

import Spam
# accessing Spam.eggs automatically imports submodule Spam.eggs
Spam.eggs.somefunction()

# on second access, nothing is imported because eggs is now a member of Spam
Spam.eggs.otherfunction()

Even in this example, one could avoid updating globals() directly by using setattr(import_module(__name__), name, submodule), emphasizing that we are "setting an attribute" instead of "creating a variable".

A different example of creating a variable 'eggs' in the Python shell

>>> import sys
>>> module = sys.modules[__name__]
>>> module.eggs = 'Humpty Dumpty'
>>> eggs
'Humpty Dumpty'