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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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Библиотека Python разработчика Telegram | DID YOU KNOW?

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How Does Telegram Make Money?

Telegram is a free app and runs on donations. According to a blog on the telegram: We believe in fast and secure messaging that is also 100% free. Pavel Durov, who shares our vision, supplied Telegram with a generous donation, so we have quite enough money for the time being. If Telegram runs out, we will introduce non-essential paid options to support the infrastructure and finance developer salaries. But making profits will never be an end-goal for Telegram.

What is Telegram?

Telegram’s stand out feature is its encryption scheme that keeps messages and media secure in transit. The scheme is known as MTProto and is based on 256-bit AES encryption, RSA encryption, and Diffie-Hellman key exchange. The result of this complicated and technical-sounding jargon? A messaging service that claims to keep your data safe.Why do we say claims? When dealing with security, you always want to leave room for scrutiny, and a few cryptography experts have criticized the system. Overall, any level of encryption is better than none, but a level of discretion should always be observed with any online connected system, even Telegram.

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