So I'm trying to finally move my web2py apps over to Python 3.7 before
Python 2.7 reaches EOL and, while for the most part they're working fine, I
am finding that when there is a problem the web2py Error ticket is just
about useless (doesn't tell you where the error actually occurs) because
web2py seems to be throwing its own exception while trying to handle the
actual exception resulting in tracebacks that look like this:
Traceback
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Traceback (most recent call last):
File "C:\FMSC_py3\web2py\gluon\restricted.py", line 220, in restricted
exec(ccode, environment)
pyodbc.DataError: ('22003', '[22003] [Microsoft][SQL Server Native Client
11.0][SQL Server]Arithmetic overflow error converting expression to data type
int. (8115) (SQLExecDirectW)')
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\FMSC_py3\web2py\gluon\restricted.py", line 141, in __init__
self.traceback = traceback.format_exc()
AttributeError: 'NoneType' object has no attribute 'strip'
I'm using Python 3.7.2 on Win7 with a freshly downloaded copy of the web2py
source and can reproduce this very easily within the included Welcome App
by adding this to the default.py controller
def causeError():
deliberate_error= 1/0
return dict(deliberate_error=deliberate_error)
Which results in the below ticket. Which, while it does say the correct
"division by zero" error, doesn't contain anything else useful in the
traceback to actually say where in the code the error happens.
Error ticket for "welcome"Ticket ID
127.0.0.1.2019-02-01.10-10-20.33b63e41-eac2-4737-a257-37232cf4fb72
<class 'ZeroDivisionError'> division by zeroVersion
web2py™ Version 2.17.2-stable+timestamp.2018.10.06.18.54.02Traceback
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Traceback (most recent call last):
File "C:\FMSC_py3\web2py\gluon\restricted.py", line 220, in restricted
except HTTP:
ZeroDivisionError: division by zero
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\FMSC_py3\web2py\gluon\restricted.py", line 141, in __init__
self.traceback = traceback.format_exc()
AttributeError: 'NoneType' object has no attribute 'strip'
In file: C:\FMSC_py3\web2py\applications\welcome\controllers/default.py
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<code object <module> at 0x03F546A8, file
"C:\FMSC_py3\web2py\applications\welcome\controllers/default.py", line 8>
This issue is making it very difficult to actually use web2py with Python 3
because when you inevitably make coding mistakes you cannot easily find
them unlike under Python 2 where the web2py ticket's traceback tells you
exactly where the issue is.
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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