Python无法从命令行找到模块，但可以从Eclipse运行

Question

I am very new to Python and have strange error. I am using Eclipse/PyDev for development and Python 2.7.3 in eclipse and commandline. I created several modules, every folder has init .py file and other source files. When I try to execute file with __name__ == '__main__' from eclipse it works fine but from command line when I call like

python models.py

Traceback (most recent call last):
  File "models.py", line 8, in <module>
    from database import uuid_generator
ImportError: No module named database

it looks like Can anybody give me clue what can be problem ?

Answer 1

database parent directory is not in sys.path (pythonpath). Try to run the script as python -mdatabase.uuid_generator while in the parent (toplevel) directory. Or create a wrapper script:

from database.uuid_generator import main

main()

And put it in database 's parent (toplevel) directory. When you call this script its directory is added to sys.path automatically so everything works without modifying modules inside database directory or PYTHONPATH environment variable.

Only the toplevel directory that has no __init__.py in it (not a Python package) need to be in sys.path ie, database directory should not be in sys.path .

See Traps for the unwary .

Answer 2

Try using this instead

from uuid_generator

edit: make sure uuid_generator.py is in the same folder as models.py

Answer 3

Apparently eclipse has added the database directory to the module search path.

To get the same effect without modifying the script you can append the path to database into $PYTHONPATH environment variable.

If you are open to modifying the script you can add this towards the top after importing relevant modules sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

untested hack

see JFSebastian's answer and comment below instead