python遇到错误时怎么让程序重新执行？

Question

连try都没法捕获这种错误吗，程序直接停了

try:    with open('','r', encoding='utf-8') as file:        content = file.read()        print(content)except Err:    print("出错了")

with open('','r', encoding='utf-8') as file:
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
FileNotFoundError: [Errno 2] No such file or directory: ''

Answer 1

指定文件错误类 FileNotFoundError 就能捕获，如果题主是需要通用错误捕获也是 Exception，我印象中没有 Err 这个错误类

try:    with open('', 'r', encoding='utf-8') as file:        content = file.read()        print(content)except FileNotFoundError:    print("文件不存在")# 或者捕获全部错误try:    with open('', 'r', encoding='utf-8') as file:        content = file.read()        print(content)except Exception:    print("文件不存在")