python中关于正则表达式的小问题？？？

[lifreshman]

def find_sender():
	part = 'From:(.*)<.*?>';
	zz = re.compile(part);
	for line in fileinput.input('d:\\python\\f.txt'):
		m = zz.match(line);
		if m:
			print(m.group(1));

f.txt的内容为：
subject:freshman
From:gui<[e-mail]><sfasf>adfa<asdfg>
content:fasdfadfalljkaskdflj

结果是gui<[e-mail]><sfasf>adfa
我想要的结果是 gui， 请问这个？在排除非贪婪是怎么用的，是用<开始到第一个>结束吗？这个该怎么写请大侠指点！

[chenguo67]

From:(.+?)<.*?>

[iambic]

?少用。特别是贪婪和非贪婪混用的时候，容易出错。一般使用排除就可以解决：
r'From:([^<>]*)<[^<>]*>'

[libralibra]

你不就要匹配个发件人姓名吗?正则写那么长干嘛啊
测试

IDLE 2.6.6      
>>> s = """subject:freshman
From:gui<[e-mail]><sfasf>adfa<asdfg>
content:fasdfadfalljkaskdflj"""
>>> s
'subject:freshman\nFrom:gui<[e-mail]><sfasf>adfa<asdfg>\ncontent:fasdfadfalljkaskdflj'
>>> import re
>>> res = r'From:(.*?)<'
>>> m = re.findall(res,s)
>>> len(m)
1
>>> m[0]
'gui'
>>>