1、traceback.print_exc()
2、traceback.format_exc()
3、traceback.print_exception()

簡單說下這三個方法是做什么用的：

1、print_exc()：是對異常棧輸出
2、format_exc()：是把異常棧以字符串的形式返回，print(traceback.format_exc()) 就相當于traceback.print_exc()
3、print_exception()：traceback.print_exc()實現(xiàn)方式就是traceback.print_exception(sys.exc_info())，可以點sys.exc_info()進去看看實現(xiàn)

測試代碼如下：

def func(a, b):
    return a / b


if __name__ == '__main__':
    import sys
    import time
    import traceback

    try:
        func(1, 0)
    except Exception as e:
        print('***', type(e), e, '***')
        time.sleep(2)

        print("***traceback.print_exc():*** ")
        time.sleep(1)
        traceback.print_exc()
        time.sleep(2)

        print("***traceback.format_exc():*** ")
        time.sleep(1)
        print(traceback.format_exc())
        time.sleep(2)

        print("***traceback.print_exception():*** ")
        time.sleep(1)
        traceback.print_exception(*sys.exc_info())

運行結果：

*** <class 'ZeroDivisionError'> division by zero ***


***traceback.print_exc():*** 
Traceback (most recent call last):
  File "E:/HttpRunnerManager-jh/ApiManager/tests.py", line 42, in <module>
    func(1, 0)
  File "E:/HttpRunnerManager-jh/ApiManager/tests.py", line 33, in func
    return a / b
ZeroDivisionError: division by zero


***traceback.format_exc():*** 
Traceback (most recent call last):
  File "E:/HttpRunnerManager-jh/ApiManager/tests.py", line 42, in <module>
    func(1, 0)
  File "E:/HttpRunnerManager-jh/ApiManager/tests.py", line 33, in func
    return a / b
ZeroDivisionError: division by zero


***traceback.print_exception():*** 
Traceback (most recent call last):
  File "E:/HttpRunnerManager-jh/ApiManager/tests.py", line 42, in <module>
    func(1, 0)
  File "E:/HttpRunnerManager-jh/ApiManager/tests.py", line 33, in func
    return a / b
ZeroDivisionError: division by zero

可以看出，三種方式打印結果是一樣的。在開發(fā)時，做調(diào)試是很方便的。也可以把這種異常棧寫入日志。

logging.exception(ex)

# 指名輸出棧蹤跡, logging.exception的內(nèi)部也是包了一層此做法
logging.error(ex, exc_info=1) 

# 更加嚴重的錯誤級別 
logging.critical(ex, exc_info=1) 

# 我直接copy的，未嘗試。有時間會試下的

python 還有一個模塊叫cgitb，輸出的error非常詳情。

    try:
        func(1, 0)
    except Exception as e:
        import cgitb
        cgitb.enable(format='text')
        func(1, 0)

參考：
https://blog.csdn.net/lengxingxing_/article/details/56317838