multi-line messages in raised exceptions?

[Skaperen]

many of my functions accept many keyword arguments like:

1 2	def callme(*args,**opts):     ...

they then have code to pop off the known keywords like:

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def callme(*args,**opts):     foo = opts.pop('foo',default_foo)     bar = opts.pop('bar',default_bar)     ...

then they check to see if any keywords are leftover like:

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def callme(*args,**opts):     foo = opts.pop('foo',default_foo)     bar = opts.pop('bar',default_bar)     if opts:         raise ValueError(f'unknown keywords: {", ".join(x for x in opts.keys())}')     ...

is it possible to output a multi-line message, one line for each keyword in this example, in the raised exception? i would also like to check the arguments, too, and combine messages related to this, too.

[ichabod801]

You know, it probably would have been less effort to just try to raise a multiline exception message than to type out a whole post explaining your function design and why you want to do it.

In fact, I'm sure it would have been, because I tried it and it took less effort than typing this post up.

[Larz60+]

do you already have a process capturing exceptions?
if you don't know what exceptions are being thrown, you can use a general capture
You can replace with exception names as indentified

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try:     ... except:     print("Unexpected error:", sys.exc_info()[0])     print(f"Args:")     for arg in args:         print(f"{arg}")     raise

[Skaperen]

i'm not trying to capture the exception. it's a function. the caller that imported it may want to capture it. but if not, i want to have a line per keyword that remains in the dictionary.