python中不支持的操作数类型错误

Question

def get_word_count(wordlist, final):
    regex = []
    count = [[] for x in xrange(len(wordlist))]
    frequency = []
    regex = makeregex(wordlist)
    for i in range(len(final)-1):
        size = os.stat(final[i]).st_size
        fil = open(final[i])
        if(fil):
            print final[i] + " read!"
            data = mmap.mmap(fil.fileno(), size, access=mmap.ACCESS_READ)
            for j in range (len(wordlist)):
                count[j].append(re.findall(regex[j], data))
        fil.close()
    for k in range(len(wordlist)):
        frequency.append(sum(count[k]))
    print frequency

count is a list of lists and every list has some numbers stored into it. I wish to store the sum of every list as an element to a new list frequency

When I run the code I get an error :

Traceback (most recent call last):
File "C:\Users\Animesh\Desktop\_zipf.py", line 52, in <module>
get_word_count(wordlist, final)
File "C:\Users\Animesh\Desktop\_zipf.py", line 32, in get_word_count
frequency.append(sum(count[k]))
TypeError: unsupported operand type(s) for +: 'int' and 'list'

What should I change in my code ? Please help

Answer 1

count[j].append(re.findall(regex[j], data))

You're adding list of found words by the regex to the array count[j] , so each count element is a list of list of strings, thus the error when calling sum(count[k]) .

I think you want to append to count[k] the number of found words:

count[j].append(len(re.findall(regex[j], data)))

Answer 2

If you want to make it simpler, you could get rid of the count = [[] for x in xrange(len(wordlist))] and just have count = [] and later in the for loop you make it increment a temporary variable and append that to count after the for loop.

size = 0
for j in range (len(wordlist)):
    size += len(re.findall(regex[j], data)) #thanks to CharlesB for this bit
count.append(size) #you could also cut out the middle man and just append frequency