Python 测试URL是否存在

测试python中是否存在URL的最佳方法是什么？我目前使用cURL，但我想切换到python

在cURL中，我使用

curl http://www.google.com | tidy -i

import httplib

try:
    url = httplib.HTTPConnection('yahoo.com')
    url.connect()
except httplib.HTTPException as ex:
    print "not connected"

---

与bash脚本一起使用，最快的方法可能是

curl http://www.google.com | tidy -i

import httplib

try:
    url = httplib.HTTPConnection('yahoo.com')
    url.connect()
except httplib.HTTPException as ex:
    print "not connected"

---

最快的方法大概是

curl http://www.google.com | tidy -i

import httplib

try:
    url = httplib.HTTPConnection('yahoo.com')
    url.connect()
except httplib.HTTPException as ex:
    print "not connected"

---

最快的方法大概是

curl http://www.google.com | tidy -i

import httplib

try:
    url = httplib.HTTPConnection('yahoo.com')
    url.connect()
except httplib.HTTPException as ex:
    print "not connected"

---

最快的方法大概是

curl http://www.google.com | tidy -i

import httplib

try:
    url = httplib.HTTPConnection('yahoo.com')
    url.connect()
except httplib.HTTPException as ex:
    print "not connected"