I am trying to use AWS python library boto3 to create a session. I found out we can do that either
session = boto3.Session(profile_name='profile1')
or
session2 = boto3.session.Session(profile_name='profile2')
I have checked their docs, it suppose to use boto3.session.Session().
Why both ways work ? What the different of concept behind them ?
It is just for convenience; they both refer to the same class. What is happening here is that the __init__.py for the python boto3 package includes the following:
from boto3.session import Session
This just allows you to refer to the Session class in your python code as boto3.Session rather than boto3.session.Session.
This article provides more information about this python idiom:
One common thing to do in your
__init__.pyis to import selected Classes, functions, etc into the package level so they can be conveniently imported from the package.