Import a file from a subdirectory?

Question

I have a file called tester.py, located on /project.

/project has a subdirectory called lib, with a file called BoxTime.py:

/project/tester.py /project/lib/BoxTime.py 

I want to import BoxTime from tester. I have tried this:

import lib.BoxTime 

Which resulted:

Traceback (most recent call last):   File "./tester.py", line 3, in <module>     import lib.BoxTime ImportError: No module named lib.BoxTime 

Any ideas how to import BoxTime from the subdirectory?

EDIT

The __init__.py was the problem, but don't forget to refer to BoxTime as lib.BoxTime, or use:

import lib.BoxTime as BT ... BT.bt_function() 

Answer 1

Take a look at the Packages documentation (Section 6.4).

In short, you need to put a blank file named

__init__.py 

in the lib directory.

Answer 2

• Create a subdirectory named lib.
• Create an empty file named lib\__init__.py.

• In lib\BoxTime.py, write a function foo() like this:

  def foo():     print "foo!" 

• In your client code in the directory above lib, write:

  from lib import BoxTime BoxTime.foo() 

• Run your client code. You will get:

  foo! 

---

Much later -- in linux, it would look like this:

% cd ~/tmp % mkdir lib % touch lib/__init__.py % cat > lib/BoxTime.py << EOF heredoc> def foo(): heredoc>     print "foo!" heredoc> EOF % tree lib lib ├── BoxTime.py └── __init__.py  0 directories, 2 files % python  Python 2.7.6 (default, Mar 22 2014, 22:59:56)  [GCC 4.8.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> from lib import BoxTime >>> BoxTime.foo() foo!