this code is get the templates/blog1/page.html in b.py:
path = os.path.join(os.path.dirname(__file__), os.path.join(\'templates\', \'blog1/page.html\'))
You can apply dirname repeatedly to climb higher: dirname(dirname(file)). This can only go as far as the root package, however. If this is a problem, use os.path.abspath: dirname(dirname(abspath(file))).
dirname(dirname(file))
os.path.abspath
dirname(dirname(abspath(file)))