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Python捕获异常时打印出错误所在行数

 7 months ago
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Python捕获异常时打印出错误所在行数

在开发中，可能一个源文件代码行数比较多，尤其变量在多个地方存在，报错定位不好确定时，可以使用以下代码来捕获异常并打印出错误所在行数。这样就可以便于快速定位到出问题的地方啦。

import sys

try:
    ...
except Exception as e:
    print(f"Error on line {sys.exc_info()[-1].tb_lineno}: {str(e)}")

# 直接 print(e) 的效果：
'NoneType' object has no attribute 'number_plate'

# 打印出错误行数的效果：
Error on line 78: 'NoneType' object has no attribute 'number_plate'
Python

打印异常的堆栈信息：

import traceback

try:
    open("nonexistent_file.txt")
except Exception:
    print(traceback.format_exc())
Python

会打印出完整的堆栈跟踪信息，包括错误发生的位置和调用堆栈。

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