pip 安装：我正在尝试在我的 MacBook Air 中安装 pip，但它显示语法错误：语法无效

如何解决pip 安装：我正在尝试在我的 MacBook Air 中安装 pip，但它显示语法错误：语法无效

Traceback (most recent call last):
  File "/usr/local/bin/pip",line 11,in <module>
    load_entry_point('pip==21.0.1','console_scripts','pip')()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py",line 489,in load_entry_point
    return get_distribution(dist).load_entry_point(group,name)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py",line 2843,in load_entry_point
    return ep.load()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py",line 2434,in load
    return self.resolve()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py",line 2440,in resolve
    module = __import__(self.module_name,fromlist=['__name__'],level=0)
  File "/Library/Python/2.7/site-packages/pip-21.0.1-py2.7.egg/pip/_internal/cli/main.py",line 60
    sys.stderr.write(f"ERROR: {exc}")
                                   ^
SyntaxError: invalid Syntax