pip: sys.stderr.write(f"ERROR: {exc}") with Python 3.5

i am having a trouble with pip and pip3. I am trying to install requirements and it shows an error. When i write pip3 or pip --version it show this error.

jumphost@jumphost-VirtualBox:~$ pip3 --version
Traceback (most recent call last):
  File "/usr/bin/pip3", line 9, in <module>
    from pip import __main__
  File "/usr/local/lib/python3.5/dist-packages/pip/__main__.py", line
21, in <module>
    from pip._internal.cli.main import main as _main
  File
"/usr/local/lib/python3.5/dist-packages/pip/_internal/cli/main.py", line 60
    sys.stderr.write(f"ERROR: {exc}")
                                   ^
SyntaxError: invalid syntax

If i am trying to install, it showed this

jumphost@jumphost-VirtualBox:~/kubespray$ pip install -r requirements.txt
Traceback (most recent call last):
  File "/usr/bin/pip", line 9, in <module>
    from pip import __main__
  File
"/usr/local/lib/python2.7/dist-packages/pip-21.0-py2.7.egg/pip/__main__.py",
line 21, in <module>
    from pip._internal.cli.main import main as _main
  File
"/usr/local/lib/python2.7/dist-packages/pip-21.0-py2.7.egg/pip/_internal/cli/main.py",
line 60
    sys.stderr.write(f"ERROR: {exc}")
                                   ^
SyntaxError: invalid syntax
jumphost@jumphost-VirtualBox:~/kubespray$ pip3 install -r requirements.txt
Traceback (most recent call last):
  File "/usr/bin/pip3", line 9, in <module>
    from pip import __main__
  File "/usr/local/lib/python3.5/dist-packages/pip/__main__.py", line
21, in <module>
    from pip._internal.cli.main import main as _main
  File
"/usr/local/lib/python3.5/dist-packages/pip/_internal/cli/main.py", line 60
    sys.stderr.write(f"ERROR: {exc}")
                                   ^
SyntaxError: invalid syntax

I didn't found a right answer so this is the reason why i ask you. Thanks ! I tried remove python, pip, python3 and pip3 multipletimes but still same problem.