第十六章：开发工具-traceback:异常和栈轨迹-traceback异常

16.5.3 traceback异常
TracebackException类是高层接口，可以在处理traceback时构建一个StackSummary。

import traceback
import sys

from traceback_example import produce_exception

print('with no exception:')
exc_type,exc_value,exc_tb = sys.exc_info()
tbe = traceback.TracebackException(exc_type,exc_value,exc_tb)
print(''.join(tbe.format()))

print('\nwith exception:')
try:
    produce_exception()
except Exception as err:
    exc_type,exc_value,exc_tb = sys.exc_info()
    tbe = traceback.TracebackException(
        exc_type,exc_value,exc_tb,
        )
    print(''.join(tbe.format()))

    print('\nexception only:')
    print(''.join(tbe.format_exception_only()))

format()方法生成完整traceback的格式化版本，而format_exception_only()只显示异常消息。