为什么 try/exception 方法不适用于我的 python？

Question

import os.path
from os import path
import pandas as pd

class ImportFiles:
    def __init__(self, pathname, file):
        self.pathname = pathname
        self.file = file

    def check(self):
        try:
            os.path.exists(self.pathname+'/'+self.file)
            print(f"'{self.pathname}/{self.file}': this file is valid to use")
        except OSError: 

          
    def import_csv(self):
        df = pd.read_csv(f"{self.pathname}/{self.file}")
        return df

if __name__ == "__main__":
    table= ImportFiles("C:/Users/..s", "....csv")
    table.check()

这个returns

'C:/Users/..s/....csv' : this file is valid to use

但是当我执行下一个命令时

table.import_csv()

它returns

FileNotFoundError: [Errno 2] No such file or directory: 'C:/Users/..s/....csv'

不确定为什么他们一开始找不到 OS 错误？

编辑：抱歉，我只是把 print 方法放在 except OSError

之后

print(f"Operating system raised an error: check if the file {self.file} exsits or the name is correct. Check your path that contains this file.")

Answer 1

os.path.existsreturnsTrue/False。它不会引发异常。无论文件是否存在，都会打印“此文件有效”，因为没有异常阻止它。

为什么 try/exception 方法不适用于我的 python？

Why try/exception method is not working on my python?

python

operating-system

pandas