Python: FileNotFoundError未被try-except块捕获
Python: FileNotFoundError未被try-except块捕获
提问于 2020-01-23 18:46:40
最近我开始学习Python，遇到了一个我找不到答案的问题。这个程序的想法是询问用户名，从JSON文件中加载一个字典，如果名字在字典中-打印用户喜欢的数字。
加载JSON文件的代码如下所示：
import json
fav_numbers = {}
filename = 'numbers.JSON'
name = input('Hi, what`s your name? ')
try:
with open(filename) as f_obj:
fav_numbers = json.load(f_obj)
except FileNotFoundError:
pass
if name in fav_numbers.keys():
print('Hi {}, your fav number is {}, right?'.format(name, fav_numbers[name]))
else:
number = input('Hi {}, what`s your favourte number? '.format(name))
fav_numbers[name] = number
with open(filename, 'w') as f_obj:
json.dump(fav_numbers, filename)不过，当我尝试运行它时，它崩溃了，告诉我：
Exception has occurred: FileNotFoundError
[Errno 2] No such file or directory: 'numbers.JSON'
File "/home/niedzwiedx/Dokumenty/Python/ulubionejson.py", line 22, in <module>
with open(filename) as f_obj:为了捕获异常，我做错了什么？(已尝试将FileNotFoundError更改为OSError或IOError)
回答 1
Stack Overflow用户
发布于 2020-01-23 19:36:53
错误来自于您的最后一行，在try/except之外
with open(filename, 'w') as f_obj:
json.dump(fav_numbers, filename)filename是字符串，而不是文件。
你必须使用
with open(filename, 'w') as f_obj:
json.dump(fav_numbers, f_obj)为了更安全起见，您也可以用try/except将此部分括起来
try:
with open(filename, 'w') as f_obj:
json.dump(fav_numbers, f_obj)
except (FileNotFoundError, PremissionError):
print("Impossible to create JSON file to save data")页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/59876735
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