aws-quickstart fails with "SyntaxError: invalid syntax"

[mahima-ipath]

Environment

• pip version:20.3.4
• Python version:Python 2.7.5
• OS: RHEL 7.7

Description
After upgrading to PIP 20.3.4, getting this error,

[INFO] Relax tty requirement
[INFO] Check for python/pip
Traceback (most recent call last):
  File "<stdin>", line 24226, in <module>
  File "<stdin>", line 199, in main
  File "<stdin>", line 82, in bootstrap
  File "/tmp/tmpVWyxHB/pip.zip/pip/_internal/cli/main.py", line 60
    sys.stderr.write(f"ERROR: {exc}")
                                   ^
SyntaxError: invalid syntax

Expected behavior

Working fine with PIP 20.3.3

How to Reproduce

git clone https://github.com/aws-quickstart/quickstart-linux-utilities.git
          export P=/quickstart-linux-utilities/quickstart-cfn-tools.source
          source $P
          qs_bootstrap_pip || qs_err " pip bootstrap failed "

Output

qs_bootstrap_pip || qs_err " pip bootstrap failed "
[INFO] Relax tty requirement
[INFO] Check for python/pip
Traceback (most recent call last):
  File "<stdin>", line 24226, in <module>
  File "<stdin>", line 199, in main
  File "<stdin>", line 82, in bootstrap
  File "/tmp/tmpVWyxHB/pip.zip/pip/_internal/cli/main.py", line 60
    sys.stderr.write(f"ERROR: {exc}")
                                   ^
SyntaxError: invalid syntax

[pradyunsg]

Thanks for filing this issue! Unlike the description implies, the issue is not with pip 20.3.4, but with aws-quickstart is using https://bootstrap.pypa.io/get-pip.py directly:

https://github.com/aws-quickstart/quickstart-linux-utilities/blob/c357bcc12d6b004667e8aba20702c05a0e8e0c5e/quickstart-cfn-tools.source#L295

The latest get-pip.py (which is for 21.0, NOT 20.3.4) does not support Python 2.

Please file an issue with them to update their scripts for the reality that pip as dropped Python 2 support and they should use get-pip.py from https://bootstrap.pypa.io/2.7/ instead. :)