面试题：使用python打印出文件中出现次数最高的10个单词及其出现次数。
import re,collections
words=re.findall('\w+',open(r'D:\zip.txt').read().lower())
print collections.Counter(words).most_common(10)
\w （查找字母）When the LOCALE and UNICODE flags are not specified, matches any alphanumeric character and the underscore; this is equivalent to the set [a-zA-Z0-9_]. With LOCALE, it will match the set [0-9_] plus whatever characters are defined as alphanumeric
for the current locale. If UNICODE is set, this will match the characters [0-9_] plus whatever is classified as alphanumeric in the Unicode character properties database.