在python中具有多个子目录的运行时导入

Question

what is the best way to perform this type of import in python

file to be imported which is available in location one/ne_one/one_two/"

fielname : two.py

def foo():
    print "venkatttt!"

main file : main.py

s = __import__("one.one_one.one_two.two", fromlist=[])
function_class =  getattr(s,"one_one")
function_class1 =  getattr(function_class,"one_two")
function_class2 =  getattr(function_class1,"two")
print s
print function_class
print function_class1
print function_class2
function_class2.foo()

output of this code:

<module 'one' from '/opt/auto/src/ex/one/__init__.pyc'>
<module 'one.one_one' from '/opt/auto/src/ex/one/one_one/__init__.pyc'>
<module 'one.one_one.one_two' from '/opt/auto/src/ex/one/one_one/one_two/__init__.pyc'>
<module 'one.one_one.one_two.two' from '/opt/auto/src/ex/one/one_one/one_two/two.py'>
venkatttt!

i am looking out for the best way to perform this import

Answer 1

From your output, I can see you already have __init__.py files in each subdirectory, therefore, you can simply import them:

$> from one.one_one.one_two.two import foo
$> foo()

If you want a handle for each module, you can import them separately:

$> import one.one_one as function_class
$> import one.one_one.one_two as function_class1
$> import one.one_one.one_two.two as function_class2

Finally, you can also define __all__ in one/__init__.py and let this auto-imports happen automatically when import one is executed.