Re: Python 2 to 3 conversion

[Will McDonald <wmcdonald@xxxxxxxxx>]

On Tue, 19 Nov 2024 at 13:45, Patrick O'Callaghan <pocallaghan@xxxxxxxxx> wrote:

I'm attempting to convert a small Python-2 script to Python-3. Google
appears to think that the best approach is something called 2to3, but I
can't get it to work. I'm far from being a Python expert, but am at
least using a virtual environment:

poc@Bree:~$ cd venv
poc@Bree:~/venv$ source bin/activate
(venv) poc@Bree:~/venv$ type 2to3
2to3 is /home/poc/venv/bin/2to3
(venv) poc@Bree:~/venv$ 2to3
Traceback (most recent call last):
  File "/home/poc/venv/bin/2to3", line 5, in <module>
    from cmd_2to3.__main__ import main
  File "/home/poc/venv/lib64/python3.13/site-packages/cmd_2to3/__main__.py", line 2, in <module>
    from lib2to3.main import main as l2to3_main
ModuleNotFoundError: No module named 'lib2to3'
(venv) poc@Bree:~/venv$ pip install lib2to3
ERROR: Could not find a version that satisfies the requirement lib2to3 (from versions: none)
ERROR: No matching distribution found for lib2to3

I've never used 2to3 but the pip library is called '2to3' not lib2to3, although some Stack Overflow posts[1] do suggest that the packaged version is sometimes called python3-lib2to3?

wmcdonald@fedora ~ → poetry search 2to3 | head

2to3 (1.0)
 Adds the 2to3 command directly to entry_points.

wmcdonald@fedora ~ → mkdir -p ~/scratch/python/migrate
wmcdonald@fedora ~ → cd $_

13:54:42 wmcdonald@fedora migrate → python -m venv .migrate
wmcdonald@fedora migrate → . .migrate/bin/activate

(.migrate) wmcdonald@fedora migrate → pip list
Package Version
------- -------
pip     23.3.2

(.migrate) wmcdonald@fedora migrate → pip install 2to3
Collecting 2to3
 Downloading 2to3-1.0-py3-none-any.whl.metadata (225 bytes)
Downloading 2to3-1.0-py3-none-any.whl (1.7 kB)
Installing collected packages: 2to3
Successfully installed 2to3-1.0

13:56:08 (.migrate) wmcdonald@fedora migrate → python
Python 3.12.7 (main, Oct  1 2024, 00:00:00) [GCC 14.2.1 20240912 (Red Hat 14.2.1-3)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import 2to3
  File "<stdin>", line 1
    import 2to3
           ^
SyntaxError: invalid decimal literal

>>> import lib2to3
<stdin>:1: DeprecationWarning: lib2to3 package is deprecated and may not be able to parse Python 3.10+

>>> dir(lib2to3)
['__builtins__', '__cached__', '__doc__', '__file__', '__loader__', '__name__', '__package__', '__path__', '__spec__', 'warnings']

[1] https://stackoverflow.com/questions/20458011/how-to-use-2to3-properly-for-python

-- 
_______________________________________________
users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx
Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx
Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue