Find the Longest Sentence

Find the Longest Sentence

import sys
from string import split


f=open(sys.argv[1])
content=f.read()
#print content
sentence=split(content,'.')
largest=smallest=len(sentence[0])
total=0
print sentence
large=small=len(sentence[1])
tot=0
count=0
for a in sentence:
    if len(a)>0:
        count+=1
        if len(a)>large:
            large=len(a)
        if len(a)<small:
            small=len(a)
        tot+=len(a)
        print 'the lenght of sentence '+str(count)+' is = '+str(len(a))
print 'the longest sentence is = '+str(large)
print 'the smallest sentence is = '+str(small)
print 'the avg. sentence length is = '+str(tot/(len(sentence)-1))
#'-1' is because afte last fullstop an empty element is also taken