TypeError: write() argument must be str, not bytes (While handling error)

[schneidersoft]

Using python3 and webpy Version: 0.40.dev1

There is an issue when a specific error occurs that triggers another error.

something like:
jdata = json.loads(web.data())
#say the key data does not exist
foo = jdata['data']

Will cause a never ending error spiral

KeyError: 'data'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "env/lib/python3.6/site-packages/web/application.py", line 255, in process
return p(lambda: process(processors))
File "brase/brase.py", line 186, in load_sqlachemy
return handler()
File "env/lib/python3.6/site-packages/web/application.py", line 255, in
return p(lambda: process(processors))
File "env/lib/python3.6/site-packages/web/application.py", line 264, in process
raise self.internalerror()
File "env/lib/python3.6/site-packages/web/application.py", line 545, in internalerror
return debugerror()
File "env/lib/python3.6/site-packages/web/debugerror.py", line 313, in debugerror
return web._InternalError(djangoerror())
File "env/lib/python3.6/site-packages/web/debugerror.py", line 303, in djangoerror
return t(exception_type, exception_value, frames)
File "env/lib/python3.6/site-packages/web/template.py", line 904, in call
return BaseTemplate.call(self, *a, **kw)
File "env/lib/python3.6/site-packages/web/template.py", line 831, in call
return self.t(*a, **kw)
File "env/lib/python3.6/site-packages/web/debugerror.py", line 193, in template

File "env/lib/python3.6/site-packages/web/webapi.py", line 364, in input
out = rawinput(_method)
File "env/lib/python3.6/site-packages/web/webapi.py", line 341, in rawinput
a = cgi.FieldStorage(fp=fp, environ=e, keep_blank_values=1)
File "/usr/lib/python3.6/cgi.py", line 561, in init
self.read_single()
File "/usr/lib/python3.6/cgi.py", line 740, in read_single
self.read_binary()
File "/usr/lib/python3.6/cgi.py", line 762, in read_binary
self.file.write(data)
TypeError: write() argument must be str, not bytes

[schneidersoft]

It looks like weby is catching the key error and trying to build the error page but encounters another error while doing so... and another and so on.

[nokyan]

Is there something happening about this issue or is there workaround?

[anandology]

The work-around is to set:

web.config.debug = False

before creating the application.

Could you please share the a snippet of code to reproduce this issue?

[nokyan]

Seems my error is a bit different after all, sorry for that.

[iredmail]

Hi @schneidersoft,

Could you please try again with the latest git version of web.py? we're busy fixing py3 compatibility issues, reply here with related error if it doesn't work.

[schneidersoft]

I was not able to reproduce the error on the latest master.

[iredmail]

Thanks for the feedback. :)