为什么找不到我的python模块？

Question

I am learning python currently.

I am running pydev in eclipse.

Eclipse has the following folder in the PYTHONPATH: /Users/peter/Documents/workspace/python

In that folder, there is a python package of: com.peter.minesweeper

in that folder i have 2 python modules: mineFileReader.py minesweeper_practice.py

in the latter file i have the following code:

from com.peter.minesweeper import mineFileReader

reader = mineFileReader(pathToMinesFile = "minesweeper.mines.txt")

but i am getting an error:

Traceback (most recent call last):
File "/Users/peter/Documents/workspace/java/python/com/peter/minesweeper/minesweeper_practice.py", line 6, in <module>
    from com.peter.minesweeper import mineFileReader
ImportError: No module named minesweeper

This doesn't make sense because the 'python' folder is in the PYTHONPATH and the modules appear where they are declared. What am i missing here? thanks

Answer 1

I suspect ^* that you're missing the __init__.py files in one or more of your directories. This file is what lets Python know that a directory should be considered a package. So your directory structure should look like this:

python
  |-- com
      |-- __init__.py
      |-- peter
          |-- __init__.py
          |-- minesweeper
              |-- __init__.py
              |-- mineFileReader.py
              |-- minesweeper_practice.py

---

Also worth elaborating on my comment: needlessly long package names are generally avoided in Python. Probably you could put all this in one minesweeper package.

---

^{*Well, technically I know , since you told me so in the comments ;-)}