How do we get the list of exceptions in Python programmatically?

Question

https://www.programiz.com/python-programming/exceptions

There is a list of exceptions in Python, and I am trying to make a list (or a set) of the exception names.

I could just simply hard code the names, but is there a way to somehow do this programmatically? Like import the exception class and get all those types of exceptions and put them a list of strings?

It may help to know what you intend to do with that list. Don't forget that imported modules and users can define their own subclasses of Exceptions. — hpaulj
– hpaulj, Commented Apr 13, 2019 at 20:59

sanyassh · Accepted Answer · 2019-04-13 21:20:36Z

4

To get list of built-in exceptions (not user-defined) you can do this:

import builtins

list_of_exception_names = [
    name for name, value in builtins.__dict__.items() 
    if isinstance(value, type) and issubclass(value, BaseException)
]

edited Apr 13, 2019 at 21:20

answered Apr 13, 2019 at 21:03

sanyassh

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3 Comments

user2357112 Over a year ago

This code will not work inside a module. __builtins__ is sometimes a dict rather than a module, in which case the __builtins__.__dict__ access fails. You should always use the builtins or __builtin__ module rather than the __builtins__ implementation detail.

user2357112 Over a year ago

Here's a demonstration of the failure.

sanyassh Over a year ago

@user2357112 thanks for your comments, improved my answer.

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