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How to provide additional information when raising exception

+4
−1

MWE

filename = "bad_dir"

print(f"File not found: {filename}.")
raise(FileNotFoundError)

Question

How do I raise an exception while adding additional information? In the example above, the exception raised is printed at the bottom of the stacktrace, and the print above it is printed at runtime and hard to find in the terminal.

Is there a way to add a string to the raised exception to provide additional information?

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1 answer

+4
−0

Python documentation suggests that you can simply add other parameters when raising the Exception and retrieve them using args:

Code

try:
	raise Exception('spam', 'eggs')
except Exception as inst:
	print(inst.args)     # arguments stored in .args
	x, y = inst.args     # unpack args
	print('x =', x)
	print('y =', y)

Output

('spam', 'eggs')
x = spam
y = eggs
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1 comment thread

To directly answer my question (1 comment)

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