练习一

def normalize(name):
    return name[0].upper() + name[1:].lower()

练习二

def prod(L):
    def muilty(x,y):
        return x*y
    return reduce(muilty, L)

练习三

def str2float(s):
    p =s.find('.')
    def char2num(s):
        digits = {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9}
        return digits[s]
    def fn(x, y):
        return x * 10 + y
    return reduce(fn, map(char2num, s[:p])) + reduce(fn, map(char2num, s[p+1:]))*0.1**(len(s)-p-1)