Deploy to heroku fails to deploy "no module dateutil.parser" when it's included in requirements.txt

Question

I'm a django newby and this is my first question posted to StackOverflow:

I've successfully deployed a couple of apps to heroku over the past month but when I added a module fixed2csv that imports dateutil.parser, heroku fails to find the module even though it's in the requirements.txt file.

Here's a snippet from heroku's deploy message...

   Downloading/unpacking python-dateutil==2.2 (from -r requirements.txt (line 20))
     Running setup.py (path:/tmp/pip_build_u20147/python-dateutil/setup.py) egg_info for

package python-dateutil

   Downloading/unpacking fixed2csv==0.2.3 (from -r requirements.txt (line 21))
     Downloading fixed2csv-0.2.3.tar.gz
     Running setup.py (path:/tmp/pip_build_u20147/fixed2csv/setup.py) egg_info for package

fixed2csv Traceback (most recent call last): File "", line 17, in File "/tmp/pip_build_u20147/fixed2csv/setup.py", line 7, in import fixed2csv File "fixed2csv.py", line 10, in import dateutil.parser ImportError: No module named dateutil.parser Complete output from command python setup.py egg_info: Traceback (most recent call last):

     File "<string>", line 17, in <module>

     File "/tmp/pip_build_u20147/fixed2csv/setup.py", line 7, in <module>

       import fixed2csv

     File "fixed2csv.py", line 10, in <module>

       import dateutil.parser

   ImportError: No module named dateutil.parser

   ----------------------------------------
   Cleaning up...
   Command python setup.py egg_info failed with error code 1 in /tmp/pip_build_u20147/fixed2csv
   Storing debug log for failure in /app/.pip/pip.log

! Push rejected, failed to compile Python app

Everything works fine in my virtualenv when I installed python-dateutil so I'm not sure where to go from here.

Update: I worked around it by not using the module that required python-dateutil. I would be interested to know how to get Heroku to recognize python-dateutil though because it's way nicer to use than messing around with strptime format strings.