我尝试在CentOS 6系统上安装名为cymysql的python模块，使用的命令如下
yum安装-y python-setuptools &&轻松安装pip && pip安装cymysql
但是，我收到一条错误消息，说有几行得到了语法错误：无效语法（请参阅下面的错误代码）---当我运行第三个命令pip install cymysql时确实发生了这种情况

Traceback (most recent call last):
  File "/usr/local/bin/pip", line 11, in <module>
    load_entry_point('pip==21.0', 'console_scripts', 'pip')()
  File "build/bdist.linux-x86_64/egg/pkg_resources/__init__.py", line 561, in load_entry_point
  File "build/bdist.linux-x86_64/egg/pkg_resources/__init__.py", line 2631, in load_entry_point
  File "build/bdist.linux-x86_64/egg/pkg_resources/__init__.py", line 2291, in load
  File "build/bdist.linux-x86_64/egg/pkg_resources/__init__.py", line 2297, in resolve
  File "/usr/local/lib/python2.7/site-packages/pip-21.0-py2.7.egg/pip/_internal/cli/main.py", line 60
    sys.stderr.write(f"ERROR: {exc}")
                               ^
SyntaxError: invalid syntax

不太清楚这里发生了什么，只是想知道是否有人可以帮助？（我在这里附上了pip文件和main.py，但我不知道www.example.com文件在哪里init.py）。顺便说一句，这是centOS 6，但我在服务器上安装了Python 3.6.10。当我运行命令python3.6 -V时，我得到了
python3.6.10
飞行员
PIP文件代码：

# !/usr/bin/python

 # EASY-INSTALL-ENTRY-SCRIPT: 'pip==21.0','console_scripts','pip'
 __requires__ = 'pip==21.0'
 import re
 import sys
 from pkg_resources import load_entry_point

 if __name__ == '__main__':
   sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0])
   sys.exit(
       load_entry_point('pip==21.0', 'console_scripts', 'pip')()  //**THIS IS LINE 11**
   )

www.example.com中的第57至62行Main.py

try:
    cmd_name, cmd_args = parse_command(args)
except PipError as exc:
    sys.stderr.write(f"ERROR: {exc}")  //**THIS IS LINE 60**
    sys.stderr.write(os.linesep)
    sys.exit(1)