如下:
(代码来自于Programming in Python 3 2nd Edition)
import sys
import collections
sites = collections.defaultdict(set)
for filename in sys.argv[1:]:
for line in open(filename):
i = 0
while True:
site = None
i = line.find("http://", i)
if i > -1:
i += len("http://")
for j in range(i, len(line)):
if not (line[j].isalnum() or line[j] in ".-"):
site = line[i:j].lower()
break
if site and "." in site:
sites.setdefault(site, set()).add(filename)
i = j
else:
break
for site in sorted(sites):
print("{0} is referred to in:".format(site))
for filename in sorted(sites[site], key=str.lower):
print(" {0}".format(filename))
运行之后是这样的:
这要输入啥
PS:本人是一个误入计算机专业课的生科人(别问为什么,问就是脑子抽了),没有C语言基础,只学过R