Python 文件读写与异常处理

读取文本

显式使用 UTF-8，并让上下文管理器关闭文件。即使读取或处理过程抛出异常，离开 with 代码块时文件也会被关闭。

with open("note.md", encoding="utf-8") as source:
    text = source.read()

English summary

Use a Python context manager for file handling because it closes the file automatically after reading or writing, including when an exception occurs inside the with block.

错误边界

只捕获能够处理的异常，并保留文件位置和失败原因。不要用空的 except 隐藏错误。