• 第一题

  # -*- coding: utf-8 -*-
  def normalize(name):
    return name[0].upper() + name[1:].lower()
  

• 第二题

  # -*- coding: utf-8 -*-
  from functools import reduce
  def prod(L):
    result = reduce(lambda x,y: x*y, L)
    return result
  

• 第三题

# -*- coding: utf-8 -*-
from functools import reduce

DIGITS = {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5,
          '6': 6, '7': 7, '8': 8, '9': 9}

def str2float(s):
    temp = s.split('.')
    s_L = temp[0]
    s_R = temp[1]

    def fn(x, y):
        return x * 10 + y
    def char2num(s):
        return DIGITS[s]
    x1 = reduce(fn,map(char2num,s_L))
    x2 = reduce(fn,map(char2num,s_R))/(10**len(s_R))
    return x1 + x2