python - 如果找不到文件，则引发ValueError

Question

如果找不到文件，我想引发ValueError。目前，我有以下内容:

def read_file(filename):
    try:
        with open(filename, "r") as f: 
        #do something
    except ValueError:
        print("File not found")

但是，这只会返回FileNotFoundError:如果找不到该文件

Answer 1

改为捕获IOError，并在except块内引发ValueError。

try:
    with open(filename, "r") as f: 
    #do something
except IOError:
    raise ValueError("File not found")