from functools import reduce #首字母大写str.capitalize() def normalize(name_str): return name_str.capitalize() L1 = ['adam', 'LISA', 'barT'] L2 = list(map(normalize, L1)) p(L2) # 返回L的累积 def prod(L): return reduce(lambda x,y : x*y, L) p('3 * 5 * 7 * 9 =', prod([3, 5, 7, 9])) def str2float(s): flag = 0 #如果找到小数点就截掉,并标记位置 if '.' in s: flag = s.index('.') s=s[:flag]+s[flag+1:] #输入一个char 返回一个 int 的内置函数 def char_to_int(char): return {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9}[char] #把str转换成Int tmp = reduce(lambda x,y : x*10+y, map(char_to_int,s)) #有符号就返回符号 return tmp if flag==0 else tmp/10**(len(s)-flag) p('str2float(\'123.456\') =', str2float('123.456'))
27: ['Adam', 'Lisa', 'Bart'] 28: 3 5 7 * 9 = 945 29: str2float('123.456') = 123.456 请按任意键继续. . .
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27: ['Adam', 'Lisa', 'Bart'] 28: 3 5 7 * 9 = 945 29: str2float('123.456') = 123.456 请按任意键继续. . .