1 import re
 2 from collections import Counter
 3 
 4 def count_patt(fname, patt):
 5     result = Counter()
 6     cpatt = re.compile(patt)
 7 
 8     with open(fname) as fobj:
 9         for line in fobj:
10             m = cpatt.search(line)
11             if m:
12                 key = m.group()
13                 result.update([key])
14 
15     return result
16 if __name__ == '__main__':
17     fname = 'access_log'
18     ip = '^(\d+\.){3}\d+'
19     ip_count = count_patt(fname, ip)
20     print(ip_count)
21     print('*' * 30)
22     print(ip_count.most_common(5))    # 前5名