python 新手之 文件import问题

# coding=gb2312

from lxml import *
import lxml.html
import urllib2
import lxml.html as H
import sys
reload(sys)
sys.setdefaultencoding('utf-8')
def catchInfoByUXpath(url,xstr):
c=urllib2.urlopen(url)
f=c.read()
doc=H.document_fromstring(f)
result=doc.xpath(xstr)
return result

url="http://www.baidu.cn"
xstr='/html/body/div/p[2]/a'

dir(catchInfo)
import catchInfo
url
#报错
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'url' is not defined

>>> catchInfo.url
'http://www.baidu.cn'
>>>