In Python, how do I construct an exception from another exception without raising it?

Question

Consider this snippet:

all_errors = []
for i in something:
    try:
        do_something_that_throws(i)
    except Exception as e
        # what I know I can do:
        raise MyCustomException(i) from e
        # what I actually want:
        # all_errors.append(MyCustomException(i) from e)

Is there a way to construct MyCustomException with all the initializations that from e does for me (setting __cause__ or what ever else), but without throwing the it?

Benoît P · Accepted Answer · 2019-02-19 14:30:12Z

5

AFAIK, there is no other way than to set __cause__ manually.

But since you create a custom exception, this might be helpful:

class MyCustomException(Exception):
    def __init__(self, cause=None)
        self.__cause__ = cause

edited Feb 19, 2019 at 14:30

answered Feb 19, 2019 at 14:20

Benoît P

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