Drop Python 2 support

[nvbn]

Python 2 support makes code more complicated and slow downs development.
And as Python 3 already exists almost nine years, it seems like there's no reason to support Python 2 nowadays.

[ilovezfs]

it seems like there's no reason to support Python 2 nowadays

One reason is that some systems ship with python2 only (e.g. macOS), and python3 is a non-trivial dependency to require.

[nvbn]

@ilovezfs it looks like there's already a lot formulas with python3 in dependencies.

[ilovezfs]

@nvbn sure but the vast majority use python2. It just feels like a really heavy dependency for something like this, not to mention that it has over 14,000 installs per month.

[ilovezfs]

Anyway, it's obviously up to you, but I don't think it's accurate to say there is "no reason" to support python2.

[nvbn]

@ilovezfs yep, it's a bit more complicated than I thought.

[HoweChen]

I am wondering if there is a way to close the warning whenever I open the terminal?

[ilovezfs]

@HoweChen install it with python3 :)

[HoweChen]

@ilovezfs
Well, I install it from the homebrew, maybe it's the formula's problem which uses python2 as a default. I would change this to python3, thanks.

[ilovezfs]

@HoweChen it's a HEAD install?

[HoweChen]

@ilovezfs No, it's not. When I try to install thefuck with --HEAD, and I open up a new window of the terminal. It shows this:

I thought the formula of thefuck on homebrew should add be added a new argument --with-python3. I found that homebrew itself uses Python instead of Python3 to run the command by default.

[ilovezfs]

@HoweChen Yes it makes sense a HEAD build fails. I don't understand why you're seeing the warning though. That doesn't seem to be in version 3.21. Which version do you have installed?

[HoweChen]

@ilovezfs
After reinstalling thefuck via homebrew without --HEAD, the problem has been solved. I thought it's my problem, every time when I update thefuck, I need to run brew link --overwrite thefuck. I forgot to run this command this time maybe. If there is a way to avoid running this command?