try except in list comprehension
# Python List Comprehension Error Handling:
# The correct responses to the question "how to handle exceptions in a list
# comprehension" are all expressing part of all of this truth: 1) literally,
# i.e. lexically IN the comprehension itself, you can't; 2) practically, you
# delegate the job to a function or check for error prone values when that's
# feasible.