# in mylib.py file from . import xml from .xml import some_thing from ..xml import some_thing ...

Which path is used as the root directory for this type of explicit relative reference? In particular, when the above program itself is also a library, it is

by other users after it is released.

import mylib

Then what path is calculated relative to this time?

another question,

import os assert os.path.isdir(',')

no problem. But some libraries, such as PIL

import PIL PIL.Image(...) # 就会报错，找不到Image，需要显式的 import PIL.Image PIL.Image(...) # OK

This is why? Thank you in advance.

import os os.path...