[英]Importing a python module by path
I have the following mis-fortunate situation: 我有以下不幸的情况:
Three directories ( A
, B
and C
) contain a python module M
with a function F
. 三个目录( A
, B
和C
)包含一个带函数F
的python模块M
(Those directories are not packages and it is impossible to change anything about the situation.) (这些目录不是软件包,因此无法更改任何情况。)
I am looking for a way to import them separately to access their functionalities. 我正在寻找一种单独导入它们以访问其功能的方法。 How do I need to import those modules to access F
somewhat like this: 我需要如何导入这些模块来访问F
,如下所示:
A.F()
B.F()
C.F()
This will work, but it seems a bit inelegant... 这会起作用,但是看起来有点不雅...
import sys
sys.path.append("A")
import M as A
sys.path.pop()
del sys.modules['M']
sys.path.append("B")
import M as B
and so on...
You need to exec things into a new locals dictionary. 您需要将内容执行到新的本地字典中。 You can only get to the files you mention as files, not as modules, then stuff them into a moduletype. 您只能将您提到的文件作为文件而不是作为模块,然后将其填充为模块类型。
from types import ModuleType
with open("A/M.py") as a:
A = ModuleType('A')
exec a.read() in A.__dict__
with open("B/M.py") as b:
B = ModuleType('B')
exec b.read() in B.__dict__
with open("C/M.py") as c:
C = ModuleType('C')
exec c.read() in C.__dict__
Then access them like BF() as you wanted. 然后根据需要像BF()一样访问它们。 The only problem is the module metadata isn't set up correctly, so it will appear as a builtin. 唯一的问题是模块元数据设置不正确,因此将以内置形式显示。 You can even then do: 您甚至可以这样做:
import sys
sys.modules['A'] = A
sys.modules['B'] = B
sys.modules['C'] = C
and they will be importable like import A
from other parts of your application. 它们可以像import A
从应用程序的其他部分import A
。
put an __init__.py
in each A/ B/ and C/. 在每个A / B /和C /中放置__init__.py
。 The content of this file is 该文件的内容是
from M import F
Than the following code should work: 比以下代码更有效:
import A, B, C
A.F()
B.F()
C.F()
The __init__.py
declares the directory as a package, and the statements in this file are executed when you import the package. __init__.py
将目录声明为包,并且在导入包时执行此文件中的语句。
像这样使用import
from A.M import F as A_F
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