Show only first and last line from traceback

I've build a little internal DSL with python. I'm using assert vor validation. If the end user types a wrong parameter the dsl should report whats wrong. At the moment this looks like this:

Traceback (most recent call last):
  File "tests/maskedtimefilter_test/FilterDSL_test.py", line 63, in test_dsl_validation
    input(0): self.regular
  File "/Users/sh/reetz/pythonpath/maskedtimedata/maskedtimefilter.py", line 885, in __lshift__
    kwargs = self.dsl_validation(kwargs)
  File "/Users/sh/reetz/pythonpath/maskedtimedata/maskedtimefilter.py", line 1483, in dsl_validation
    check_if_valid(parameter)
  File "/Users/sh/reetz/pythonpath/maskedtimedata/dsl.py", line 47, in kernel_a
    def kernel_a (x): assert isinstance(x, (list, tuple, np.ndarray)), "kernel must be a list."
AssertionError: kernel must be a list.

But the end users are engineers and no computer scientists. Therefore a minimal Traceback is handy. Is it possible to shrink the Traceback to the essential information (where is the failure and what's the cause) like this?:

Traceback (most recent call last):
  File "tests/maskedtimefilter_test/FilterDSL_test.py", line 63, in test_dsl_validation
    input(0): self.regular
AssertionError: kernel must be a list.

Reluctantly I'd like to use normal prints!