urllib "module object is not callable"

Question

This is my third python project, and I've received an error message: 'module object' is not callable.

I know that this means I'm referencing a variable or function incorrectly. But trial and error hasn't been able to help me solve this.

import urllib

def get_url(url):
    '''get_url accepts a URL string and return the server response code, response headers, and contents of the file'''
    req_headers = {
        'User-Agent': 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/525.13 (KHTML, like Gecko) Chrome/0.A.B.C Safari/525.13',
        'Referer': 'http://python.org'}

    #errors here on next line
    request = urllib.request(url, headers=req_headers) # create a request object for the URL
    opener = urllib.build_opener() # create an opener object
    response = opener.open(request) # open a connection and receive the http response headers + contents

    code = response.code
    headers = response.headers # headers object
    contents = response.read() # contents of the URL (HTML, javascript, css, img, etc.)
    return code , headers, contents


testURL = get_url('http://www.urlhere.filename.zip')
print ("outputs: %s" % (testURL,))

I've been using this link for reference: http://docs.python.org/release/3.0.1/library/urllib.request.html

Traceback:

Traceback (most recent call last):
  File "C:\Project\LinkCrawl\LinkCrawl.py", line 31, in <module>
    testURL = get_url('http://www.urlhere.filename.zip')
  File "C:\Project\LinkCrawl\LinkCrawl.py", line 21, in get_url
    request = urllib.request(url, headers=req_headers) # create a request object for the URL
TypeError: 'module' object is not callable

Answer 1

In python 3, the urllib.request object is a module. You need to call objects contained in this module. This is an important change from Python 2, if you are using example code you need to take that into account.

For example, creating the Request object and the opener:

request = urllib.request.Request(url, headers=req_headers)
opener = urllib.request.build_opener()
response = opener.open(request)

Read the documentation carefully.

Answer 2

urllib.request is a module. urllib.request.Request is a class. Calling a module like you're currently doing raises an error. You probably want to call the class, like this:

request = urllib.request.Request(url, headers=req_headers)  # create a request object for the URL

You'll also probably want to use build_opener of urllib.request rather than just urllib:

opener = urllib.request.build_opener()  # create an opener object