FileNotFoundError 消息未打印

Question

FileNotFoundError 中的消息不打印，它适用于 ValueError，下面是实现它的代码：

    try:
        with open(path) as f:
            if header==True:
                next(f)
            for line in f:    
                try:
                    cnt += 1
                    a = line.count("|") + 1
                    if a == fields:
                        b.append(line)
                        yield b  
                    else:
                        #raise ValueError(f"'{tail}' has {a} fields on line {cnt} but expected {fields}")
                        raise ValueError("Hello")
                except ValueError as v:
                    print(v)
                    continue
        
        raise FileNotFoundError("Wrong file or file path")
    except FileNotFoundError as e:
        print(e)

下面的输出打印了 Value 错误消息而不是 FileNotFoundError:

FileNotFoundError:

[Errno 2] No such file or directory: 'C://Users/Documents/abcde.txt'

值错误：

['bob|1|23\n']
Hello

Answer 1

语句 with open(path) as f: 中引发了 FileNotFoundError 异常。控制权立即传递给 except FileNotFoundError as e: 部分，该部分打印异常。您的代码 raise FileNotFoundError("Wrong file or file path") 未执行。

FileNotFoundError 消息未打印

FileNotFoundError message not printing

exception

file

filenotfoundexception

python-3.x

try-except