Handling Exception in Python3 [duplicate]

Question

I'm trying to run this:

try:
    number = int(number)
except ValueError:
    raise InvalidValueError("%s is not a valid base10 number." % number)

So, when I set number = '51651a' I'm getting this:

Traceback (most recent call last):
  File "test.py", line 16, in decbin
    number = int(number)
ValueError: invalid literal for int() with base 10: '51651a'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "test.py", line 51, in <module>
    print(decbin('51651a', True))
  File "test.py", line 18, in decbin
    raise InvalidValueError("%s is not a valid base10 number." % number)
__main__.InvalidValueError: 51651a is not a valid base10 number.

My question is that is there any way I don't see the line saying, "During handling of the above exception, another exception occurred:" and all that's above it.

Luke R · Accepted Answer · 2021-01-07 17:55:48Z

2

What you're looking for is disabling Exception Chaining with from None 1.

Change your raise statement to

raise InvalidValueError("%s is not a valid base10 number." % number) from None

and only your custom exception will be raised, without reference to the ValueError exception originally caught.

answered Jan 7, 2021 at 17:55

Luke R

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