Python Question

python: unhashable type error

Traceback (most recent call last):
File "<pyshell#80>", line 1, in <module>
do_work()
File "C:\pythonwork\readthefile080410.py", line 14, in do_work
populate_frequency5(e,data)
File "C:\pythonwork\readthefile080410.py", line 157, in populate_frequency5
data=medications_minimum3(data,[drug.upper()],1)
File "C:\pythonwork\readthefile080410.py", line 120, in medications_minimum3
counter[row[11]]+=1
TypeError: unhashable type: 'list'


I am getting the above error on this line:

data=medications_minimum3(data,[drug.upper()],1)


(I have also tried drug.upper() without brackets)

Here is a preview of this function:

def medications_minimum3(c,drug_input,sample_cutoff): #return sample cut off for # medications/physician
d=[]
counter=collections.defaultdict(int)
for row in c:
counter[row[11]]+=1
for row in c:
if counter[row[11]]>=sample_cutoff:
d.append(row)
write_file(d,'/pythonwork/medications_minimum3.csv')
return d


Does anyone know what I am doing wrong here?

I know that what must be wrong is the way I am calling this function, because I call this function from a different location and it works fine:

d=medications_minimum3(c,drug_input,50)


Thank you very much for your help!

Answer

I don't think converting to a tuple is the right answer. You need go and look at where you are calling the function and make sure that c is a list of list of strings, or whatever you designed this function to work with

For example you might get this error if you passed [c] to the function instead of c