python长度转换

s=input() if s[-1:] in ['m']:     s=eval(s[0:-1])*39.37     print("{:.3f}in".format(s)) elif s[-2:] in ['in']:     s=eval(s[0:-2])/39.37     print("{:.3f}m".format(s)) else:     print("输入错误") orm

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