CODEWITHSUNDEEP
pythonpython-2.7
Yan
Yan

Reputation: 153

ValueError: need more than 1 value to unpack python

def main():

    sent_file = open(sys.argv[1])
    tweet_file=open(sys.argv[2])

    scores={}
    for line in sent_file:
       term, score=line.split("/t")
       scores[term]=int(score)

the sent_file is something like this:

abandon  -2
abandoned   -2

each separated by \t, could anybody help me figure out this problem?

Upvotes: 0

Views: 4590

Answers (1)

Martijn Pieters
Martijn Pieters

Reputation: 1121486

You want to skip empty lines or lines without a \t, just catch the ValueError exception in those cases:

for line in sent_file:
    try:
        term, score = line.split("\t")
        scores[term] = int(score)
    except ValueError:
        pass

However, from the comments it appears you have data that is space-separated as well ('abilities 2\n' has no \t character in the line), so perhaps you should split on general whitespace instead:

for line in sent_file:
    try:
        term, score = line.rsplit(None, 1)  # split on last whitespace separator
        scores[term] = int(score)
    except ValueError:
        pass

Now you are splitting on the last arbitrary-width separator on the line (not counting whitespace at the start and end), and only splitting once. If any of your terms contain whitespace too, this ensures that they are preserved. This assumes your score values do not have any whitespace in them (which would also break with your own code).

If you are certain that all you have is \t separated data, or you can clean up your input files to use only tabs, an alternative could be to use the csv module instead, and to use a dict comprehension:

import csv

with open(sys.argv[1], 'rb') as sent_file:
    reader = csv.reader(sent_file, delimiter='\t')
    scores = {term: int(score) for term, score in reader}

Upvotes: 1

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