ImportError: No module named dateutil

问题:

I am trying to follow the example in the "First Steps with Celery" document. I have installed Celery using pip.

I created a file called tasks.py in ~/python/celery, and it contains the following:

from celery import Celery  celery = Celery('tasks', broker='amqp://guest@localhost//')  @celery.task def add(x, y):     return x + y 

I started a worker using celery -A tasks worker --loglevel=info while in the ~/python/celery directory, and it seems to be running.

In a separate Terminal window, I launched Python and ran the following:

from tasks import add add.delay(4, 4) 

I get the error: File "/Library/Python/2.7/site-packages/celery/utils/timeutils.py", line 17, in from dateutil import tz ImportError: No module named dateutil

How do I install dateutils? It is listed as an installed module when I type "pip freeze"

Thanks!

回答1:

That's strange, since you say you can see it as installed with pip.

I've just run pip freeze | grep date and here's what I get:

python-dateutil==1.5 

Is your response something similar? Having run the following:

$ python >>> import dateutil >>> help(dateutil) 

I am told that my dateutil module is installed in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/dateutil/__init__.py (OS X). I would check your Python install to make sure nothing went wrong. There shouldn't be a need to install it separately, but you could perhaps use pip to uninstall then reinstall

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