Why I can't import urllib2? I already have new a python interpreter in preference

Why I can't import urllib2? I already have new a python interpreter in
preference

I'm a newer to python . Today I config a environment of python . But I
have a problem when I run a test case copy from Internet.
import urllib2
I can't import urllib2. The falut infomation:
Unresolved import: urllib2
I search the Internet for resovle this problem . They said that I shoul
new a python interpreter in the preference . But I've already done that .
Please give me some clue about this.thx