从子目录导入python

Question

I have the following directories:

|-- project
|   |-- __init__.py
|   |-- proj1
|   |   |-- file.py
|   |   |-- file.py~
|   |   `-- __init__.py
|   `-- proj2
|       |-- call.py
|       |-- call.py~
|       `-- __init__.py

And the call.py has:

from proj1.file import hello

hello('nishant')

And the file.py has.

def hello(arg):
    print 'hello ,' + arg

When i am trying to call outside the project directory python project/proj2/call.py i get the import Error: No module named proj1.file

Any Idea ..?

Answer 1

This is because imports are relative to paths in your PATH environment variable (or sys.path in python). By default this var only contains the current directory, which is the directory you run from.

Run you project from within the project directory: python proj2/call.py

Alternatively, you can append your project root to sys.path before doing the imports:

import sys
sys.path.append(YOUR_PROJECT_ROOT)

Answer 2

Note that the call.py and file.py are not in same path so you need too add the prog1 to path of call.py with .. :

import sys ,os
path = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
if not path in sys.path:
    sys.path.insert(1, path)
del path