SyntaxError: invalid syntax ( class HTTPException(TracBaseError, metaclass = ABCMeta):

[Tomasz Brzezina <tomasz@…>]

I try to install 1.5.3 (I give up with 1.4 on bullseye).

Installed all needed packages and version 1.5.3:

pip install https://download.edgewall.org/trac/Trac-1.5.3-py3-none-any.whl

all needed packages installed with venv at /var/lib/trac/env

Apache2 uses wsgi:

WSGIScriptAlias /trac /var/lib/trac/apache/trac.wsgi
WSGIDaemonProcess trac python-path=/var/lib/trac:/var/lib/trac/env/lib/python3.9/site-packages

After apache2 restart accessing trac gives error:

Traceback (most recent call last):
File "/var/lib/trac/apache/trac.wsgi", line 13, in <module>
import trac.web.main
File "/var/lib/trac/env/lib/python3.9/site-packages/trac/web/__init__.py", line 14, in <module>
from trac.web.api import *
File "/var/lib/trac/env/lib/python3.9/site-packages/trac/web/api.py", line 195
class HTTPException(TracBaseError, metaclass=ABCMeta):
                                            ^
SyntaxError: invalid syntax

I can't see what's wrong.

[Jun Omae]

InstallationIssue.

The syntax is introduced in Python 3, however SyntaxError is raised on your environment. I guess you're using Apache with mod-wsgi linked Python 2.

Please ask on the MailingList for support questions.

[Jun Omae]

Try to install libapache2-mod-wsgi-py3. If libapache2-mod-wsgi is installed, uninstall libapache2-mod-wsgi before the installing.

$ dpkg -S /usr/lib/apache2/modules/mod_wsgi.so
libapache2-mod-wsgi-py3: /usr/lib/apache2/modules/mod_wsgi.so

$ ldd /usr/lib/apache2/modules/mod_wsgi.so
        linux-vdso.so.1 (0x00007ffd3858a000)
        libpython3.7m.so.1.0 => /usr/lib/x86_64-linux-gnu/libpython3.7m.so.1.0 (0x00007fbe40d6b000)
        libcrypt.so.1 => /lib/x86_64-linux-gnu/libcrypt.so.1 (0x00007fbe40d31000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fbe40d10000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fbe40d0b000)
        libutil.so.1 => /lib/x86_64-linux-gnu/libutil.so.1 (0x00007fbe40d06000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fbe40b83000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fbe409c0000)
        libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007fbe40983000)
        libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fbe40765000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fbe412aa000)