来做题 （爱上用匿名函数了，简洁明了！）
Topic source#修改成实现任意位小数转换。
from functools import reduce
d={'0':0,'1':1,'2':2,'3':3,'4':4,'5':5,'6':6,'7':7,'8':8,'9':9}
def str2float(s):
int_1=reduce(lambda x,y:x*10+y,map(lambda s:d[s],s[:s.find('.')]))
float_1=reduce(lambda x,y:(x*10+y),map(lambda s:d[s],s[s.find('.')+1:]))*(1/10**(len(s)-s.find('.')-1))
return int_1+float_1
#测试
ret=str2float('12345.6')
print(ret)
- 1
拖延症↘患者
from functools import reduce
d={'0':0,'1':1,'2':2,'3':3,'4':4,'5':5,'6':6,'7':7,'8':8,'9':9}
def str2float(s):
int_1=reduce(lambda x,y:x*10+y,map(lambda s:d[s],s[:s.find('.')]))
float_1=reduce(lambda x,y:(x*10+y),map(lambda s:d[s],s[s.find('.')+1:]))*0.001
return int_1+float_1
#测试
print('str2float(\'123.456\') =', str2float('123.456'))
if abs(str2float('123.456') - 123.456) < 0.00001:
print('测试成功!')
else:
print('测试失败!')