本文主要介绍Python中，执行pip install --upgrade pip命令升级pip后，报错sys.stderr.write(f“ERROR: {exc}”)的问题解决方法。
报错信息：
Traceback (most recent call last):
File "/usr/bin/pip2", line 9, in <module>
load_entry_point('pip==21.0', 'console_scripts', 'pip2')()
File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 378, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2566, in load_entry_point
return ep.load()
File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2260, in load
entry = __import__(self.module_name, globals(),globals(), ['__name__'])
File "/usr/lib/python2.7/site-packages/pip/_internal/cli/main.py", line 60
sys.stderr.write(f"ERROR: {exc}")
^
SyntaxError: invalid syntax
问题原因及解决方法：https://www.cjavapy.com/article/1605/
