from . import x using __import__?

问题

How do I achieve from . import x (import module x from the current package), using __import__?

Here are some attempts that failed:

>>> __import__('.', fromlist=['x'])
ValueError: Empty module name

>>> __import__('.x')
ValueError: Empty module name

How is this done using __import__?

回答1:

The __import__ built-in's semantics are dovetailed with the bytecode that the interpreter generates from import statements, and are not especially convenient for manual use. If I understand what you are going for correctly, this does what you want:

name = 'x'
mod = getattr(__import__('', fromlist=[name], level=1), name)

In versions of Python that have importlib, you might also be able to persuade importlib.import_module to do what you want with less ugliness, but I am not sure it is possible to get "from ." semantics that way.

回答2:

__import__(__name__, fromlist=['x'])

That should get you what you need.

来源：https://stackoverflow.com/questions/8408373/from-import-x-using-import