get-pip.py is triggering a Syntax Error on Python 2.7

[cclauss]

Environment

• pip version:
• Python version: 2.7.6 (Yes, I know it is dead but we are close to being 100% Py3)
• OS: Pyenv on Ubuntu Focal

Description

F-string in get-pip.py is causing Syntax Error on Py2.

File "get-pip.py", line 199, in main
bootstrap(tmpdir=tmpdir)
File "get-pip.py", line 82, in bootstrap
from pip._internal.cli.main import main as pip_entry_point
File "/tmp/tmp_iKCpH/pip.zip/pip/_internal/cli/main.py", line 60
sys.stderr.write(f"ERROR: {exc}")
^
SyntaxError: invalid syntax
The command '/bin/sh -c pyenv update && pyenv install 2.7.6' returned a non-zero code: 1
build hook failed! (1)

Expected behavior

How to Reproduce

1. Get package from '...'
2. Then run '...'
3. An error occurs.

Output

Paste the output of the steps above, including the commands themselves and
pip's output/traceback etc.

[w8mej]

Reproduced.

% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 1883k 100 1883k 0 0 12.0M 0 --:--:-- --:--:-- --:--:-- 12.0M
Traceback (most recent call last):
File "get-pip.py", line 24226, in
main()
File "get-pip.py", line 199, in main
bootstrap(tmpdir=tmpdir)
File "get-pip.py", line 82, in bootstrap
from pip._internal.cli.main import main as pip_entry_point
File "/tmp/tmpLw2oZ7/pip.zip/pip/_internal/cli/main.py", line 60
sys.stderr.write(f"ERROR: {exc}")
^
SyntaxError: invalid syntax

[kyleian]

@cclauss pull from https://bootstrap.pypa.io/2.7/get-pip.py , that's what fixed it for me.

[CraigOpie]

@cclauss pull from https://bootstrap.pypa.io/2.7/get-pip.py , that's what fixed it for me.

This solved my issue. Thanks!

[uranusjr]

I’ll advise further discussion happen in pypa/get-pip#87 instead.

[cclauss]

This usage of an f-string breaks pyenv builds of Python 2.7, 3.4, and 3.5 until pyenv/pyenv#1793 (or similar) is landed and released.

[Morsmalleo]

@cclauss pull from https://bootstrap.pypa.io/2.7/get-pip.py , that's what fixed it for me.

This solved it for me :)