[升级pip之后出现sys.stderr.write(f“ERROR: {exc}“)](%E5%8D%87%E7%BA%A7pip%E4%B9%8B%E5%90%8E%E5%87%BA%E7%8E%B0sys.stderr.writef%E2%80%9CERRORexc%E2%80%9C.md)