Fix import multi module

[kidswong999]

Python's import is very flexible and can cover the following situations:

import a
import a, b
import a as b
import a as b, c as d
import a.b
import a.b, c.d
import a.b as c
import a.b as c, d as e

from . import a
from . import a as b
from .a import b
from .a import b as c
from a import *
from a import b
from a import b, c
from a import (b, c)
from a import b as c
from a import b as c, d as e
from a.b import *
from a.b import c
from a.b import c as d
from a.b import c as d, e as f

[marijnh]

Thanks!