Python 2 -> 3, urllib.urlopen (corrected the case)

[Irv Kalb]

> On Oct 13, 2017, at 3:27 PM, Irv Kalb <Irv at furrypants.com> wrot
> If I take the same program and just modify the print statement to add parentheses, then try to run it in Python 3.6 (on a Mac):
> 
> ...
> import urllib
> 
> # set the Yahoo finance url, set stock name, ask for last price
> fullURLWithParameters = 'http://finance.yahoo.com/d/quotes.csv?s=aapl&f=l1'
> 
> # read all the data
> response = urllib.urlopen(fullURLWithParameters).read()
> 
> print('Response is: ', response)
> 
> I get the following:
> 
> Traceback (most recent call last):
>  File " ....  s/StockQuoteYahooAPIMinimal.py", line 9, in <module>
>    response = urllib.urlopen(fullURLWithParameters).read()
> AttributeError: module 'urllib' has no attribute 'urlopen'
> 
> 

Thanks for the responses, but I still can't get it to work correctly.  With MRAB's suggestion, I've modified the code to be:

from urllib import request

# set the Yahoo finance url, set stock name, ask for last price
fullURLWithParameters = 'http://finance.yahoo.com/d/quotes.csv?s=aapl&f=l1'

# read all the data
response = request.urlopen(fullURLWithParameters).read()

print('Response is: ', response)


But when I run that (Mac Python 3.6.1), I get:


Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 1318, in do_open
    encode_chunked=req.has_header('Transfer-encoding'))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 964, in send
    self.connect()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/http/client.py", line 1400, in connect
    server_hostname=server_hostname)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 401, in wrap_socket
    _context=self, _session=session)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 808, in __init__
    self.do_handshake()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 1061, in do_handshake
    self._sslobj.do_handshake()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/ssl.py", line 683, in do_handshake
    self._sslobj.do_handshake()
ssl.SSLError: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Python3 Intro Class/Module 9 - Dictionaries & Internet (not finished)/Module 9 Files/StockQuoteYahooAPIMinimal.py", line 9, in <module>
    response = request.urlopen(fullURLWithParameters).read()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 223, in urlopen
    return opener.open(url, data, timeout)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 532, in open
    response = meth(req, response)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 642, in http_response
    'http', request, response, code, msg, hdrs)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 564, in error
    result = self._call_chain(*args)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 756, in http_error_302
    return self.parent.open(new, timeout=req.timeout)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 526, in open
    response = self._open(req, data)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 544, in _open
    '_open', req)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 1361, in https_open
    context=self._context, check_hostname=self._check_hostname)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 1320, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749)>



Using Stefan's suggestion from 2to3:

import urllib.request, urllib.parse, urllib.error

# set the Yahoo finance url, set stock name, ask for last price
fullURLWithParameters = 'http://finance.yahoo.com/d/quotes.csv?s=aapl&f=l1'

# read all the data
response = urllib.request.urlopen(fullURLWithParameters).read()

print('Response is: ', response)

I get the exact same traceback as above.


Also, if I add a try/except around the call:

# read all the data
try:
    response = urllib.request.urlopen(fullURLWithParameters).read()
except urllib.error.URLError as e:
    print(e)


I get the same bottom line error from the traceback above:

<urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:749)>

Huh???



I've read a bunch of documentation, and it looks like I'm doing everything right, but I cannot get this to work.  Any other suggestions to get this 3 line program to work correctly?

Thanks,

Irv