def cleDeControle(chars):
        factor = [7, 3, 1]
        result = 0
 
        for index, char in enumerate(chars.upper()):
                if char == '<':
                        char = 0
                elif char >= 'A' and char <= 'Z':
                        char = ord(char) - 55
                else:
                        char = int(char)
 
                result += char * factor[index % 3]
 
        return result % 10
 
print cleDeControle('911016') # Affiche « 8 »

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