尝试除了不捕获 FileNotFoundError

Question

我正在尝试捕获 FileNotFoundError 并在它发生时破坏代码，但由于某种原因它不起作用，我仍然收到错误并且代码没有破坏，这是我的代码

file_name = input("Choose a file: ")
def split_columns(file_name):
    x_values = []
    y_values = []     
    try:                                            
        with open(file_name) as f:
            for line in f:
                row_values = line.split()
                print(row_values)
                x_values.append(float(row_values[0]))
                y_values.append(float(row_values[1]))
    except FileNotFoundError:
        print('This file does not exist, try again!')
        raise
    return x_values, y_values

我做错什么了？

Answer 1

从function中取出try/except ，放到调用function的循环中。

def split_columns(file_name):
    x_values = []
    y_values = []     
    with open(file_name) as f:
        for line in f:
            row_values = line.split()
            print(row_values)
            x_values.append(float(row_values[0]))
            y_values.append(float(row_values[1]))
    return x_values, y_values

while True:
    file_name = input("Choose a file: ")
    try:
        x_values, y_values = split_columns(file_name)
        break
    except FileNotFoundError:
        print('This file does not exist, try again!')