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Old 06-03-2020, 10:48 PM   #1
Registered: Aug 2006
Location: Michigan
Distribution: Ubuntu
Posts: 279

Rep: Reputation: 30
Urllib error when calling pubchempy

I have a really simple script that downloads a PNG file of a chemical. I call the script with an argument but I can't seem to pass the argument to the proper place. If I put "Aspirin" where it says "input" it works. I call the script like
python3 Aspirin
import pubchempy as pcp
import sys

input = sys.argv[1]'PNG', 'test.png', '(input)', 'name')

print (input)
The error I get:

Traceback (most recent call last):
  File "/home/jyoung/.local/lib/python3.7/site-packages/", line 271, in request
    response = urlopen(apiurl, postdata)
  File "/usr/lib/python3.7/urllib/", line 222, in urlopen
    return, data, timeout)
  File "/usr/lib/python3.7/urllib/", line 531, in open
    response = meth(req, response)
  File "/usr/lib/python3.7/urllib/", line 641, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python3.7/urllib/", line 569, in error
    return self._call_chain(*args)
  File "/usr/lib/python3.7/urllib/", line 503, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.7/urllib/", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: PUGREST.NotFound

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "", line 6, in <module>'PNG', 'test.png', '(input)', 'name')
  File "/home/jyoung/.local/lib/python3.7/site-packages/", line 462, in download
    response = get(identifier, namespace, domain, operation, outformat, searchtype, **kwargs)
  File "/home/jyoung/.local/lib/python3.7/site-packages/", line 292, in get
    response = request(identifier, namespace, domain, operation, output, searchtype, **kwargs).read()
  File "/home/jyoung/.local/lib/python3.7/site-packages/", line 274, in request
    raise PubChemHTTPError(e)
  File "/home/jyoung/.local/lib/python3.7/site-packages/", line 1299, in __init__
    raise NotFoundError(self.msg)
pubchempy.NotFoundError: 'PUGREST.NotFound'
Old 06-04-2020, 02:41 AM   #2
Registered: Mar 2020
Posts: 994

Rep: Reputation: Disabled
Originally Posted by snowman81 View Post
input = sys.argv[1]'PNG', 'test.png', '(input)', 'name')
This is obviously wrong. The last line probably should be
Code:'PNG', 'test.png', input, 'name')
1 members found this post helpful.
Old 06-04-2020, 06:40 AM   #3
Registered: Aug 2006
Location: Michigan
Distribution: Ubuntu
Posts: 279

Original Poster
Rep: Reputation: 30
Damn, Thanks! Can I do the same ting with test.png to make it like 'input'.png?

Last edited by snowman81; 06-04-2020 at 06:44 AM.
Old 06-04-2020, 07:56 AM   #4
Registered: Nov 2014
Posts: 305

Rep: Reputation: Disabled
It's called string concatenation.

input + '.png'
(as long as input is a string)


pubchempy, python, urllib

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