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Начиная с Python 3.0, при возникновении нового исключения внутри блока except перехваченное исключение автоматически сохраняется в атрибуте __context__ создаваемого исключения. В результате при выводе будут показаны оба исключения:


try:
1 / 0
except ZeroDivisionError:
raise ValueError('Zero!')



(most recent call last):
File "test.py", line 2, in <module>
1 / 0
ZeroDivisionError: division by zero

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "test.py", line 4, in <module>
raise ValueError('Zero!')
ValueError: Zero!


Кроме того, вы можете явно указать причинное исключение, использовав конструкцию raise … from. Тогда в атрибут __cause__ нового исключения будет помещено исходное:


division_error = None

try:
1 / 0
except ZeroDivisionError as e:
division_error = e

raise ValueError('Zero!') from division_error



(most recent call last):
File "test.py", line 4, in <module>
1 / 0
ZeroDivisionError: division by zero

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "test.py", line 8, in <module>
raise ValueError('Zero!') from division_error
ValueError: Zero!


👉@BookPython



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Начиная с Python 3.0, при возникновении нового исключения внутри блока except перехваченное исключение автоматически сохраняется в атрибуте __context__ создаваемого исключения. В результате при выводе будут показаны оба исключения:


try:
1 / 0
except ZeroDivisionError:
raise ValueError('Zero!')



(most recent call last):
File "test.py", line 2, in <module>
1 / 0
ZeroDivisionError: division by zero

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "test.py", line 4, in <module>
raise ValueError('Zero!')
ValueError: Zero!


Кроме того, вы можете явно указать причинное исключение, использовав конструкцию raise … from. Тогда в атрибут __cause__ нового исключения будет помещено исходное:


division_error = None

try:
1 / 0
except ZeroDivisionError as e:
division_error = e

raise ValueError('Zero!') from division_error



(most recent call last):
File "test.py", line 4, in <module>
1 / 0
ZeroDivisionError: division by zero

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "test.py", line 8, in <module>
raise ValueError('Zero!') from division_error
ValueError: Zero!


👉@BookPython

BY Библиотека Python разработчика | Книги по питону


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