EP 21 Enforce Clarity with Keyword-Only Arguments ref: http://qiita.com/giwa/items/7b04ce6f7262c2003321

file0.txt

def safe_division(number, divisor, ignore_overflow, ignore_zero_division):
    try:
        return number / divisor
    except OverflowError:
        if ignore_overflow:
            return 0
        else:
            raise
    except ZeroDivisionError:
        if ignore_zero_division:
            return float('inf')
        else:
            raise

file1.txt

safe_division(1, 0, True, False)

file2.txt

def safe_division_b(number, divisor,
        ignore_overflow=False,
        ignore_zero_division=False):
    pass

file3.txt

safe_division_b(1, 10**500, ignore_overflow=True)
safe_division_b(1, 0, ignore_zero_division=True)

file4.txt

safe_division_b(1, 0, True, False)

file5.txt

def safe_division_c(number, divisor, *,
        ignore_overflow=False,
        ignore_zero_division=False):
    pass

safe_division_c(1, 10**500, True, False)

file6.txt

   safe_division_c(1, 10 **500, True, False)
TypeError: safe_division_c() takes 2 positional arguments but 4 were given