def str2float(s): def str2num(s): return {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9}[s] def fn1(x,y): return x10+y c=s.index('.') d=len(s) g=d-c-1 return (reduce(fn1,map(str2num,s[:c])))+pow(10,-g)reduce(fn1,map(str2num,s[c+1:]))
return {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9}[s] 最后面的[s] 是什么意思啊？请问
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def str2float(s): def str2num(s): return {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9}[s] def fn1(x,y): return x10+y c=s.index('.') d=len(s) g=d-c-1 return (reduce(fn1,map(str2num,s[:c])))+pow(10,-g)reduce(fn1,map(str2num,s[c+1:]))