python防止对象无对应方法或变量报错

为了防止打印对象中不包含的属性时报错, 应先判断对象中是否有此属性, 有才打印

import urllib2
 
req = urllib2.Request('http://blog.csdn.net/cqcre')
try:
    urllib2.urlopen(req)
except urllib2.URLError, e:
    if hasattr(e,"code"):
        print e.code
    if hasattr(e,"reason"):
        print e.reason
else:
    print "OK"

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