AttributeError: 'bytes' object has no attribute 'encode'

[anonymous]

How to Reproduce

While doing a GET operation on /prefs/localization, Trac issued an internal error.

The issue in ticket:13378 is related to the problem reported here. I am reporting this issue since there might be more similar issues related to porting to python3.

Request parameters:

{'panel_id': 'localization'}

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Firefox/78.0

System Information

Trac	1.5.2
Babel	2.5.1
Docutils	0.14
Jinja2	2.11.3
mod_wsgi	4.6.4 (WSGIProcessGroup WSGIApplicationGroup %{GLOBAL})
PostgreSQL	server: 10.15, client: 12.4
psycopg2	2.7.5 (dt dec pq3 ext lo64)
Pygments	2.2.0
Python	3.6.8 (default, Aug 24 2020, 17:57:11) [GCC 8.3.1 20191121 (Red Hat 8.3.1-5)]
pytz	2017.2
setuptools	39.2.0
Subversion	1.14.1 (r1886195)
jQuery	1.12.4
jQuery UI	1.12.1
jQuery Timepicker	1.6.3

Enabled Plugins

Interface Customization

Python Traceback

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/trac/web/main.py", line 609, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/local/lib/python3.6/site-packages/trac/web/main.py", line 301, in dispatch
    raise e
  File "/usr/local/lib/python3.6/site-packages/trac/web/main.py", line 248, in dispatch
    resp = chosen_handler.process_request(req)
  File "/usr/local/lib/python3.6/site-packages/trac/prefs/web_ui.py", line 108, in process_request
    resp = chosen_provider.render_preference_panel(req, panel_id)
  File "/usr/local/lib/python3.6/site-packages/trac/prefs/web_ui.py", line 219, in render_preference_panel
    default_timezone = get_timezone(default_timezone_id) or localtz
  File "/usr/local/lib/python3.6/site-packages/trac/util/datefmt.py", line 1177, in get_timezone
    tz = pytz.timezone(to_unicode(tzname).encode('ascii', 'replace'))
  File "/usr/lib/python3.6/site-packages/pytz/__init__.py", line 158, in timezone
    zone = ascii(zone)
  File "/usr/lib/python3.6/site-packages/pytz/__init__.py", line 55, in ascii
    s.encode('ASCII') # Raise an exception if not ASCII
AttributeError: 'bytes' object has no attribute 'encode'

[Jun Omae]

Thanks for the reporting!

[Jun Omae]

That's a pytz issue. Use pytz 2017.3 or later.

See ​https://git.launchpad.net/pytz/diff/?id=f64785f3f1e9349e73cf32f789b4e53ee567690e

[anonymous]

Great, that solved it for me. On CentOS 8, prefering to use the default package manager, I had to go through the hassle of upgrading to python 3.8 to be able to install a newer version of pytz.

Thanks for the hint.