如何存储通过“ for statement”变量获得的打印结果？

Question

I am counting some specific bigram words frequency. and below are the part of my codes.

sorted_bigrams = sorted(bigrams.items(), key = lambda pair:pair[1], reverse = True)

for bigram, count in sorted_bigrams:
    if bigram == ("interesting", "news"):
        print count

here, I want to store the counting number of the printing result "count", which is the counting number of bigram "interesting, news"

how can I do it..

Answer 1

If you want to store the total count:

sorted_bigrams = sorted(bigrams.items(), key = lambda pair:pair[1], reverse = True)

total_count = 0
for bigram, count in sorted_bigrams:
    if bigram == ("interesting", "news"):
        print count
        total_count += count
print total_count

If you want to keep track of the breakdown of the counts:

sorted_bigrams = sorted(bigrams.items(), key = lambda pair:pair[1], reverse = True)

counts = []
for bigram, count in sorted_bigrams:
    if bigram == ("interesting", "news"):
        print count
        counts.append(count)
print counts

Answer 2

if bigrams is a dict storing bigram as key and count as value, then you don't need to sort it in order to get total count as the keys are unique.

if bigrams is list of tuples, you can use collections.Counter to get the total count.

In [30]: bigrams
Out[30]: [(('a', 'b'), 10), (('d', 'f'), 3), (('a', 'c'), 15), (('a', 'b'), 2)]

In [31]: counter = Counter()

In [32]: for key, val in bigrams:
    counter[key] += val
   ....:     

In [33]: counter[('a', 'b')]
Out[33]: 12