[Python learning journey] --- Dynamically importing modules

When the # character called a module when the blow 
# a first embodiment 
A = Import __ __ ( 'test.123') 
a.123 #a is to get the top of the module test, and then calls the 123 

# a second embodiment 
import importlib # import module 
a = importlib.import_module ( 'test.123') # get direct method call is test.123