Python字符串转换成浮点数函数分享
利用map和reduce编写一个str2float函数,把字符串'123.456'转换成浮点数123.456
from functools import reduce
def str2float(s):
return reduce(lambda x,y:x+int2dec(y),map(str2int,s.split('.')))
def char2num(s):
return {'0':0,'1':1,'2':2,'3':3,'4':4,'5':5,'6':6,'7':7,'8':8,'9':9}[s]
def str2int(s):
return reduce(lambda x,y:x*10+y,map(char2num,s))
def intLen(i):
return len('%d'%i)
def int2dec(i):
return i/(10**intLen(i))
print(str2float('123.456'))
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