Python 从兄弟目录导入
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Import from sibling directory
提问by skylerl
I have a Python class called "ClassA" and another Python class which is supposed to import ClassA which is "ClassB". The directory structure is as follows:
我有一个名为“ClassA”的 Python 类和另一个应该导入 ClassA 的 Python 类，即“ClassB”。目录结构如下：
MainDir
../Dir
..../DirA/ClassA
..../DirB/ClassB
How would I use sys.pathso that ClassB can use ClassA?
我将如何使用sys.path以便 ClassB 可以使用 ClassA？
采纳答案by Keith
You really should be using packages. Then MainDir is placed at a point in the file system on sys.path (e.g. .../site-packages), then you can say in ClassB:
你真的应该使用包。然后将 MainDir 放置在文件系统中 sys.path 上的某个点（例如 .../site-packages），然后您可以在 ClassB 中说：
from MainDir.Dir.DirA import ClassA # which is actually a module
You just have to place files named __init__.pyin each directory to make it a package hierarchy.
您只需要__init__.py在每个目录中放置命名的文件即可使其成为包层次结构。
回答by crazylammer
You can use relative import(example from link, current module - A.B.C):
您可以使用相对导入（例如来自链接，当前模块 - A.B.C）：
from . import D # Imports A.B.D
from .. import E # Imports A.E
from ..F import G # Imports A.F.G
回答by Remi
as a literal answer to the question 'Python Import from parent directory':
作为问题“从父目录导入 Python”的字面答案：
to import 'mymodule' that is in the parent directory of your current module:
导入当前模块的父目录中的“mymodule”：
import os
parentdir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
os.sys.path.insert(0,parentdir)
import mymodule
editUnfortunately, the __file__attribute is not always set.
A more secure way to get the parentdir is through the inspect module:
编辑不幸的是，该__file__属性并不总是设置。获取 parentdir 的更安全方法是通过检查模块：
import inspect
currentdir = os.path.dirname(os.path.abspath(inspect.getfile(inspect.currentframe())))
parentdir = os.path.dirname(currentdir)
