--> -->
 
 
<type 'exceptions.ImportError'>		Python 2.7.18: /usr/bin/python
Mon Apr 27 18:14:08 2026

A problem occurred in a Python script. Here is the sequence of function calls leading up to the error, in the order they occurred.

 /home/cgpotts/christopherpotts.net/ling/teaching/cs224u/lambdas/index.cgi in <module>()
     13 import sys
     14 sys.path.append('/home/cgpotts/lib/nltk')
=>   15 import nltk
     16 
     17 ######################################################################
nltk undefined
 /home/cgpotts/lib/nltk/nltk/__init__.py in <module>()
     90 from tree import *
     91 from util import *
=>   92 from yamltags import *
     93 
     94 # don't import contents into top-level namespace:
yamltags undefined
 /home/cgpotts/lib/nltk/nltk/yamltags.py in <module>()
      2 
      3 """
      4 Register YAML tags in the NLTK namespace with the YAML loader, by telling it
      5 what module and class to look for.
      6 
yaml undefined

<type 'exceptions.ImportError'>: No module named yaml
      args = ('No module named yaml',)
      message = 'No module named yaml'