Python Dict problems

[venu gopal]

Hello people,
iam finding great difficulty in handling a two-dimentional dictionary or any 
other similar data structure for the following purpose:
from a collection of words,i need to have the count of each word so if i 
use:
                    str=f.getline()
                    for l in range(flen):
                          if subs[l].has_key(str):
                                  subs[l][str]=1
                          else:
                                  subs[l][str]+=1

for this iam getting an error as "Type error:cannot concatenate str + int"
i would be very grateful to the python-list if any one of you could kindly 
help me in solving this problem.

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