###练习3——优化 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): def str2num(s): return DIGITS[s] def num2floatint(x,y): return x10+y if '.' in s: n=len(s) p=s.index('.') ints=list(map(str2num,s[0:p])) floats=list(map(str2num,s[p+1:n+1])) nf=len(floats) return reduce(num2floatint,ints)+reduce(num2floatint,floats)10**(-nf) else: a=list(map(str2num,s)) return reduce(num2floatint,a)
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乾乾謙謙居正
###练习3——优化 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): def str2num(s): return DIGITS[s] def num2floatint(x,y): return x10+y if '.' in s: n=len(s) p=s.index('.') ints=list(map(str2num,s[0:p])) floats=list(map(str2num,s[p+1:n+1])) nf=len(floats) return reduce(num2floatint,ints)+reduce(num2floatint,floats)10**(-nf) else: a=list(map(str2num,s)) return reduce(num2floatint,a)