Python新手，只是不确定对python做什么

我想使用urllib2-Request拨打电话 我该怎么做，例如在repl中。 我找不到正确的方法

$ python3
Python 3.7.3 (default,Apr  3 2019,05:39:12) 
[GCC 8.3.0] on linux
Type "help","copyright","credits" or "license" for more information.
>>> from urllib2 import Request,urlopen,URLerror,HTTPerror
Traceback (most recent call last):
  File "<stdin>",line 1,in <module>
ModuleNotFoundError: No module named 'urllib2'
>>> from urllib2 import Request,in <module>
ModuleNotFoundError: No module named 'urllib2'
>>> import Request
Traceback (most recent call last):
  File "<stdin>",in <module>
ModuleNotFoundError: No module named 'Request'
>>> import urllib2
Traceback (most recent call last):
  File "<stdin>",in <module>
ModuleNotFoundError: No module named 'urllib2'
>>> 

...
req = Request(URL,json_message) #(URL and json_message defined but not shown here)

...

我是否必须将urllib2单独安装到系统中？ 就像我说的那样，只是Python新手不知道步骤和语法。谢谢！

我正在工作的示例有

from urllib2 import Request,URLError,HTTPError

然后使用Request(...，但是当我在python3 repl中尝试该操作时，我得到了

$ python3
Python 3.7.3 (default,"credits" or "license" for more information.
>>> from urllib2 import Request
Traceback (most recent call last):
  File "<stdin>",in <module>
ModuleNotFoundError: No module named 'urllib2'
>>>