def str2float(s): def ch2num(s): return {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9}[s] def fn(x,y): return x * 10 + y def str2int(s): return reduce(fn,map(ch2num,s)) dot = 0 flag = 1 for ch in s: if ch == '.': flag = 0 break dot+=1 if flag == 1 : return str2int(s) return str2int(s[:dot]) + str2int(s[dot+1:]) / pow(10, len(s[dot+1:]))
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青之幻想