ImportError：没有名为…的模块（但是我有__init__.py文件并设置了PYTHONPATH）

Question

I know this question is asked over and over, but looking at all the similar questions here I cannot seem to find any answers that are much different that what I have already tried... Apologies if this really is a duplicate.

I have a simple python package that have written called "clam". But when I try to import a module from it, I get the ImportError: no module named ... error.

But if I directly import the module I do not get an error:

import libClam  <-- this works.

I have looked at a number of similar questions here to see what I am doing wrong but they all seem to suggest doing what I have already done (set my PYTHONPATH to point to the parent directory of the module I am trying to import AND to add an empty file named:

__init__.py

that lives in that directory). I have also poured over this page:

https://docs.python.org/2/tutorial/modules.html

(specifically the section 6.4 Packages)

Here is a short output from my shell:

bvz@manjaro-xps15:~/Documents/dev/clam$ pwd
/home/bvz/Documents/dev/clam

bvz@manjaro-xps15:~/Documents/dev/clam$ ls -l
total 56
-rwxrwxrwx 1 bvz users   348 Apr  7 14:48 clamError.py
-rw-r--r-- 1 bvz users   769 Apr  7 14:48 clamError.pyc
-rw-r--r-- 1 bvz users     0 Apr 10 22:23 __init__.py
-rw-r--r-- 1 bvz users   127 Apr  3 20:10 __init__.pyc
-rwxrwxrwx 1 bvz users  7782 Apr 10 22:32 libClam.py
-rw-r--r-- 1 bvz users  7006 Apr 10 22:32 libClam.pyc
-rwxrwxrwx 1 bvz users 13602 Apr 10 19:06 libClarisse.py
-rw-r--r-- 1 bvz users 11585 Apr 10 22:19 libClarisse.pyc
-rwxrwxrwx 1 bvz users     0 Apr  7 12:28 parking.py

bvz@manjaro-xps15:~/Documents/dev/clam$ cat __init__.py

bvz@manjaro-xps15:~/Documents/dev/clam$ env | grep PYTHONPATH
PYTHONPATH=/home/bvz/Documents/dev/squirrel:/home/bvz/Documents/dev/clam:

bvz@manjaro-xps15:~/Documents/dev/clam$ python2
Python 2.7.15 (default, Jan 10 2019, 23:20:52) 
[GCC 8.2.1 20181127] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path
['', '/home/bvz/Documents/dev/squirrel', '/home/bvz/Documents/dev/clam', '/usr/lib/python27.zip', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-linux2', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/lib/python2.7/site-packages', '/usr/lib/python2.7/site-packages/setuptools-39.1.0-py2.7.egg']
>>> import clam.libClam
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named clam.libClam
>>> from clam import libClam
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named clam
>>> import libClam
>>> 

Notice the last line where the simple statement:

import libClam

works. So apparently I have successfully set my PYTHONPATH, but somehow it does not recognize the parent directory as a package.

python 3.7 is the default installation on this machine (ie if I type 'python' I get a python 3.7 session). But this code needs to run in a DCC package that is still limited to python 2.7. Could that be part of the issue?

I am sorry for the very basic nature of this question, but even trying to do all of my due diligence and research I am coming up with a blank. Thanks.

Answer 1

Imports should be relative to the directory you run Python from. Since your current working directory is already inside clam , you should not include it in your import. Instead, do:

import libClam