Python 2.7 Module Request/500 Error Troulbeshooting

[silverx]

Hi everyone,

i have just tried to launch a python script but it trows the infamous 500 Error.

I think there might be some module missing from the server. Here is what i need:

 

Server: Johnny

User: silverb

Python Version: 2.7

 

Modules:

- __future__ for the print_function

- os

- json

- time

 

The baffling fact is that these modules should come with a "default" python installation, so i'm not sure if this is the problem. I would also need the httplib2, google api client and oauth2 module, but i read that they are already present in johnny's python 2.7.

 

Apart from a possible module missing, could there be some problem with reading a file from the current work directory or creating a folder and a file?

 

Thank you for your support and your time.

Edited September 3, 2017 by silverx

[Krydos]

The baffling fact is that these modules should come with a "default" python installation,

The modules that come with a default python are not included on the list because they are guaranteed to be there. The list is for installed modules only.

# /usr/bin/python2.7
Python 2.7.13 (default, Aug 25 2017, 20:17:53)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-18)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> import json
>>> import time
>>> import httplib2
>>> import googleapiclient
>>> import oauth2client
>>> from __future__ import print_function
>>> import not_a_module
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named not_a_module

None of your imports are causing the 500 error. The final not_a_module is to show what it would look like if any of those imports were the issue.

 

Here's a way to debug your script:

• Go to https://johnny.heliohost.org:2083/frontend/paper_lantern/cron/index.html
• Type in an email address that you would like to receive the error report at
• Click update email
• Go to https://www.google.com/search?q=current+time+in+pst
• Pick a time roughly 5 minutes in the future to give you time to finish the rest of this tutorial
• Type the minutes (example: 5 for 2:05pm)
• Type in the hour in 24 hour format (example: 14 for 2:05pm)
• Put * in the next three boxes, day, month, weekday
• In command put your shebang without the leading #! (example: /usr/bin/python2.7)
• Followed by a space and then the absolute path to your script that is throwing a 500 error (example: /home/silverb/public_html/DFArchiver.py)
• Click Add New Cron Job
• Wait until the time that you set your cron job to run and then check your email
• If you got an email be sure to click delete next to your cron under the Current Cron Jobs header to make sure you don't exceed your 2 per day limit

Here is an example email I just got:

Date: Sun, 03 Sep 2017 08:06:02 -0700
X-AntiAbuse: This header was added to track abuse, please include it with any abuse report
X-AntiAbuse: Primary Hostname - johnny.heliohost.org
X-AntiAbuse: Original Domain - yahoo.com
X-AntiAbuse: Originator/Caller UID/GID - [503 498] / [47 12]
X-AntiAbuse: Sender Address Domain - johnny.heliohost.org
X-Get-Message-Sender-Via: johnny.heliohost.org: authenticated_id: krydos2/primary_hostname/system user
X-Authenticated-Sender: johnny.heliohost.org: krydos2
X-Source: 
X-Source-Args: CROND 
X-Source-Dir: /home/krydos2
Content-Length: 136

  File "/home/krydos2/public_html/cgi-bin/test.py", line 6
    
                            ^
SyntaxError: unexpected EOF while parsing

Sure enough line 6 is

print("Heliohost rules!"

It's (intentionally) missing the closing parenthesis.

[silverx]

Thank you very much for your patience. It was a stupid typo that i inserted while adapting it to the new file hierarchy. Now it works like a charm.