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练习3

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用户3801067161

#1 Created at ... [Delete] [Delete and Lock User]

from functools import reduce def str2float(s): l = s.split(".") if len(l) != 2: return reduce(lambda x,y:x10+y, [ord(x)-ord('0') for x in l[0]]) / 1.0 zhengshu = reduce(lambda x,y:x10+y, [ord(x)-ord('0') for x in l[0]]) if l[0] != '' else 0 xiaoshu = reduce(lambda x,y:x+y/10.0, [ord(x)-ord('0') for x in l[1]]) if l[1] != '' else 0 xiaoshu /= 10.0 return zhengshu + xiaoshu

str2float("123") 123.0 str2float("123.1") 123.1 str2float(".1") 0.1 str2float("0.1") 0.1

用户3801067161

#2 Created at ... [Delete] [Delete and Lock User]

小数部分处理错了，重新修改为： def str2float(s): l = s.split(".") if len(l) != 2: return reduce(lambda x,y:x10+y, [ord(x)-ord('0') for x in l[0]]) / 1.0 zhengshu = reduce(lambda x,y:x10+y, [ord(x)-ord('0') for x in l[0]]) if l[0] != '' else 0 xiaoshu = reduce(lambda x,y:x10+y,[ord(x)-ord('0') for x in l[1]])/10.0*len(l[1]) if l[1] != '' else 0 return zhengshu + xiaoshu

str2float("123.123") str2float("123") str2float(".123")

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