python/exercises/binary/example.py

def parse_binary(digits):
    if set(digits) - set('01'):
        raise ValueError("Invalid binary literal: " + digits)
    return sum(int(digit) * 2 ** i
               for (i, digit) in enumerate(reversed(digits)))
binary: Adopt functional style, add error handling The Binary class and its __int__ method is replaced by the parse_binary function as discussed in #79. Instead of asking for a return value of 0 for invalid literals, the tests now demand that a ValueError be raised. 2014-06-29 00:41:13 +02:00			`def parse_binary(digits):`
			`if set(digits) - set('01'):`
			`raise ValueError("Invalid binary literal: " + digits)`
			`return sum(int(digit) * 2 ** i`
			`for (i, digit) in enumerate(reversed(digits)))`