import sys path = r'c:\NeoZQYY\apps\miniprogram\miniprogram\pages\board-finance\board-finance.wxss' with open(path, 'r', encoding='utf-8') as f: lines = f.readlines() # line 883 (0-indexed 882) is the closing } # insert align-items before it lines[882] = ' text-align: left;\n align-items: flex-start;\n}\n' with open(path, 'w', encoding='utf-8') as f: f.writelines(lines) print('OK') sys.stdout.flush()