infinite-error.py

class InfiniteError(Exception):
    def __init__(self, func):
        super().__init__("Oops!")
        func()

def func():
    """Very useful docstring.
    Long enough so lemon approves.
    """
    raise InfiniteError(func)

oops.py

content = """class Oops(Exception):
    \"\"\"Oops!\"\"\"
    pass"""
import os, sys
# path to exception file
path = os.path.join(sys.path[0], 'exception.py')
for x in range(1,4378):
    print(x)
    # if arbitrary conditions apply
    if (x % 7 == 0) and ((x * 2) % 19 == 0):
        # open file, write our exception to it
        file = open(path, 'w+')
        file.write(content)
        file.close()
        # import exception then delete file
        from exception import Oops
        os.remove(path)
        # Oops!
        raise Oops('Oops!')

ternary.py

value = True
{True: 'String ok', False: 'String nok'}[value == 'ok']
('NOT OK', 'OK')[value == "ok"]