First, draft a pseudocode for your approach (add it as comments in your file):

# Check that ... # Check that ... # Create ... # For each number ... # If ... # TODO # Return the list 

Lets try writing this function:

def listPrimes(start, end): """ Return a list with all prime numbers between `start` and `end` (including `start`, if applicable, but not including `end`). Return None if start or end are not int or if they are less than or equal to 1. If no primes exist in the given range, return an empty list. """ return "stub"